track(s) and the sampling rateand youre up and running! With the BRC Master Remote Control, its even easier since all AI-1 controls are available from the BRCs Digital I/O edit menu. Optic digital interface. ADATs Proprietary Multichannel Optic Digital Interface carries up to eight tracks simultaneously via optic cable, allowing for perfect, degradation-free digital dubbing between ADATs. With analog recording, bouncing tracks or backing up from one multitrack to another loses one generation, which adds hiss and distortion. With digital recording, such procedures will produce a clone of the original. This makes it easy to create extra copies of tracks or safety copies of entire tapes, or make multiple copies for distribution. The AI-1 lets you choose a pair of tracks from a single ADAT, and output them to the AES/EBU and S/PDIF connections. This allows for direct digital connection to and from other digital audio recorders, DAT recorders, CDs, hard disk recorders, synthesizers, and more. Fast and easy hookup. Connection of the AI-1 is accomplished via fiber optic digital audio cables, which connect the AI-1 to and from a single ADAT or multiple ADAT system. Connection to AES/EBU devices is provided via XLR type connectors. Connection to S/PDIF devices is provided by both fiber optic and RCA connectors. When used with the BRC and multiple ADATs, the Sync Out of the last ADAT in the chain is connected to the Sync In of the AI1, using a 9 pin style sync cable. The last ADATs digital out is connected to the AI-1s digital in, and the AI-1s digital out is connected to the digital in of the first ADAT, using fiber optic cables. When the BRC is turned on, it automatically becomes the systems master, and assigns each ADAT an identification number, from first to last in the chain. The BRC also automatically checks to see if an AI-1 is connected, and provides remote control over all of its functions. Voltage tolerant power supply. The AI-1 accepts any AC voltage between 90 and 250 volts. For more information on digital recording, see Appendix 1 in the ADAT manual. Appendix 2 in the ADAT manual is a glossary of
digital recording terms that may be helpful as you read this manual.
1.1 IMPORTANT NOTES ABOUT THIS MANUAL
This manual has been designed as a reference to assist the recording professional in learning the basic operation of the AI-1. All functions are explained in a clear manner, using step-by-step instructions and illustrations for setting up and performing various operations. However, it is assumed that you already have some understanding of multitrack recording and digital audio in general. It also assumes you have read the ADAT manual (and the BRC manual, if you are using the BRC) and comprehend its/their operation. If you have little or no previous experience with multitrack recording or working with digital audio, please read the second manual that comes with the BRC Master Remote Control, entitled BRC Concepts and Applications. It will give you an understanding of how an ADAT/BRC/AI-1 system functions in real world applications, and the types of things you may expect. It explains why certain features are significant, and how to employ them in your recording routine. Most importantly, there are simple tutorials for commonly performed operations, which illustrate exactly how to put it all together. In this manual, all connectors, buttons and LEDs are spelled with all capital letters (such as S/PDIF LED button or SOURCE ADAT button).

1.2 OVERVIEW OF MAIN FUNCTIONS
Here is a brief rundown of the AI-1s main functions:

1.2A Digital Interface

The AI-1 provides conversion between ADAT, AES/EBU and S/PDIF digital formats. This means you can record from other digital audio devices onto ADAT, or vice-versa, without ever
leaving the digital domain. The AI-1 can be used to transfer digital audio back and forth between DAT machines, CD player/ recorders and digital audio workstations. Whenever you transfer digital audio through the AI-1, the result is a perfect, exact duplicate of the original with no degradation or change in audio quality.
1.2B Digital Audio Synchronization
All digital audio protocols, whether Alesis Proprietary Multichannel Optical Digital Interface or AES/EBU format, transmit data plus a timing clock that dictates the speed at which the data will be recorded or played back. This timing clock is related to the sample rate. The ADAT speed is controlled automatically to conform to this sample rate whenever its DIGITAL IN LED is lit. Therefore, the PITCH controls on the ADAT have no effect when performing digital transfers onto ADAT.
1.2C Sample Rate Conversion
The AI-1 also provides conversion between 48kHz and 44.1kHz sampling rates. If you are recording onto ADAT from a source that is running at 44.1kHz, you can either record at the same rate, or convert it to ADATs superior 48kHz sampling rate. One of the best ways to use ADAT is not only as a multitrack recorder, but as a mixdown recorder as well, using two tracks to mix to. Using the AI1, you can transfer the two-track mix to DAT or a CD recorder and simultaneously convert the audio to the required 44.1kHz sample rate. Because of its superior sound quality, it is always better to record onto ADAT at the 48kHz rate, even when the original audio was recorded at 44.1kHz. Contrary to what many people think, converting 44.1kHz audio to 48kHz does not change the sound quality in any way. If, however, you choose to not to convert such an audio source and record it onto ADAT at 44.1kHz, dont be surprised when you play back the ADAT recording and hear the music a little faster and transposed up a bit. This is because 48kHz is literally a faster sampling rate than 44.1kHz. When the AI-1 sends 44.1kHz audio to ADAT, the ADATs motor slows down to match the rate of the incoming audio. If you are monitoring other prerecorded tracks on the same machine, youll notice that they are now slower and transposed down.
When you play back the audio once it is on ADAT, it will adjust back to its normal speed and of course sound sharproughly 147 cents sharp. If you want to hear the audio on ADAT at the original pitch and speed, bring the ADATs pitch setting down to -147. Doing so will temporarily show 44.1 in the ADATs LED display, indicating that you are now running at the equivalent to the 44.1kHz rate.

1.3C ADAT Channel

The four ADAT CHANNEL buttons (1/2, 3/4, 5/6, and 7/8) are used to select two channels on which an ADAT will transmit or receive digital audio. When one of these buttons is pressed, its LED will be lit indicating it has been selected. Only the four defined channel groupings (1 & 2, 3 & 4, 5 & 6, or 7 & 8) may be selected from the front panel. In most cases, only one of the four ADAT CHANNEL buttons will be lit, indicating the two channels on which an ADAT will transmit or receive audio. If both the Source and Destination are set to ADAT, all four ADAT CHANNEL buttons will be lit indicating that
all eight channels of the ADAT digital bus are transferred. When using the BRC Master Remote Control, any two channels can be selected, in which case the ADAT CHANNEL button(s) corresponding to each selected channel will be lit. Example: if the BRC is used to select channels 2 and 5 as the ADAT channels, two of the AI-1s ADAT CHANNEL buttons (the 1/2 and 5/6 buttons) will be lit indicating the groupings which contain the selected channels.

1.3D Destination Rate

The DESTINATION RATE buttons (48kHz and 44.1kHz) are used to select the AI-1s sample clock output. When one of these buttons is pressed, its LED will be lit indicating it has been selected. Only one of the two DESTINATION RATE buttons will be lit to indicate the output sampling rate. The input rate is automatically set to match that of the digital source (i.e. whatever rate the source uses, the AI-1 will automatically detect it and adjust the sampling rate accordingly). Here are descriptions of the two Destination Rate possibilities: 48kHz: If the source rate is 48kHz, this buttons LED will be lit indicating the AI-1s sample rate. If the source rate is 44.1kHz, pressing the 48kHz button will convert the sources sample rate to 48kHz. 44.1kHz: If the source rate is 44.1kHz, this buttons LED will be lit indicating the AI-1s sample rate. If the source rate is 48kHz, pressing the 44.1kHz button will convert the sources sample rate to 44.1kHz. Note: If the AI-1s Destination is set to ADAT and the sources sample rate is 48kHz, you will not be able to select the 44.1kHz button nor alter the AI-1s output rate. This is because ADAT already uses a 48kHz sample rate, which is of course superior to 44.1kHz. If the source rate is neither 48kHz or 44.1kHz, the SOURCE button LED corresponding to the source (ADAT, AES/EBU or S/PDIF) will flash, and no sample rate conversion will be allowed. This will be

In the meantime, you may be tempted to reconnect the AI-1 to a different ADAT when you want to route digital audio to tracks on another machine. However, to avoid a lot of cable swapping, we recommend swapping tapes instead. For example, lets say you have two ADATs, the AI-1 is connected to and from ADAT #1. When you wish to record from an S/PDIF source onto tracks 9 and 10 (ADAT #2), the best and quickest solution is to swap tapes between the two ADATs and record onto tracks 1 and 2. During this time, any prerecorded tracks may appear on different channels of your mixer (unless you have a sophisticated patch-bay system). But this is a minor inconvenience that lasts only until you have finished recording from the AI-1. It is recommended that you use the BRC Master Remote Control if you have a multiple ADAT system, due to greater flexibility in digital routing. However, it is possible to incorporate the AI-1 into a multiple ADAT system without the BRC. To connect the AI-1 to a multiple ADAT system: 1. Connect one end of a shielded dual male, 9-pin D connector to the first ADATs SYNC OUT jack, and connect the other end of the cable to the SYNC IN jack of the second ADAT; 2. For each additional ADAT slave, connect one end of an additional shielded dual male, 9-pin D connector to the second ADAT slaves SYNC OUT jack, and the other end to the third ADAT slaves SYNC IN jack. Its SYNC OUT jack then connects to the fourth ADAT slaves SYNC IN jack, and so on; 3. Connect one end of a fiber optic cable to the first ADATs DIGITAL OUT, and connect the other end of the cable to the DIGITAL IN of the second ADAT; Note: If the other end of a fiber optic cable is disconnected and a signal is being sent through the cable, you will be able to see a red light at the output. This is an LED and not a laser light, so you dont have to worry about damage to your eyes. 4. For each additional ADAT slave, connect one end of an additional fiber optic cable to the second ADAT slaves DIGITAL
OUT, and the other end to the third ADAT slaves DIGITAL IN. Its DIGITAL OUT then connects to the fourth ADAT slaves DIGITAL IN, and so on; 5. Connect one end of a fiber optic cable to the DIGITAL OUT of the last ADAT in the chain, and connect the other end of the cable to the AI-1s ADAT optic DIGITAL IN; 6. Finally, connect one end of a fiber optic cable to the AI-1s ADAT optic DIGITAL OUT, and the other end to the optic DIGITAL IN of the first ADAT in the system. This last step creates a loop in the digital bus, and thus allows for communication between all ADATs and the AI-1. Figure 2

Note: In a multiple ADAT system, if power is turned off on one of the ADATs in the middle of the chain, all ADATs following it will no longer sync to the master ADAT, as the sync information will not pass through a unit that is turned off.

2.1C Connecting the BRC

When using the BRC, the AI-1s ADAT digital in and out connect between the last ADAT and the first ADAT in the system. In order for transfer of digital audio to be possible, the AI-1 requires synchronization information from the BRC. Synchronization requires a dual male, 9-pin D connector to connect the last ADAT in the system to the AI-1. In addition, a BNC-type connector must be used to connect the 48kHz word clock output of the AI-1 into the
BRC. This is required so that the BRC can synchronize to an AES/EBU or S/PDIF source. Both these connections can be made while power is on or off, and the ADATs do not need to be turned on in any particular order (see figure 3). To connect the AI-1 to a BRC and a multiple ADAT system: 1. Connect one end of a shielded dual male, 9-pin D connector to the SYNC OUT jack of the last ADAT in the system, and connect the other end of the cable to the SYNC IN jack of the AI-1; 2. Connect one end of a BNC connector to the 48kHz OUT jack on the AI-1, and connect the other end of the cable to the 48kHz IN jack on the BRC; 3. Connect one end of a shielded fiber optic cable into the optic DIGITAL OUT of the last ADAT in the system, and connect the other end of the fiber optic cable to the AI-1s ADAT optic DIGITAL IN; Note: If the other end of a fiber optic cable is disconnected and a signal is being sent through the cable, you will be able to see a red light at the output. This is an LED and not a laser light, so you dont have to worry about damage to your eyes. 4. Connect one end of a fiber optic cable to the AI-1s ADAT optic DIGITAL OUT, and the other end to the optic DIGITAL IN of the first ADAT in the system. This last step creates a loop in the digital bus, and thus allows for communication between all ADATs and the AI-1.

Figure 3

Note: In a multiple ADAT system, if power is turned off on one of the ADATs in the middle of the chain, all ADATs following it will no longer sync to the BRC, as the sync information will not pass through a unit that is turned off.

2.2 AES/EBU AND S/PDIF

2.2A Connecting an AES/EBU Device
Digital routing to and from an AES/EBU device requires XLR type cables. These connections can be made while power is on or off, and the components do not need to be turned on in any particular order. To connect an AES/EBU device: 1. Connect one end of an XLR cable into the AES/EBU XLR output of the AI-1, and the other end to the XLR input of the AES/EBU device; 2. Connect one end of an XLR cable into the AES/EBU XLR output on the device, and the other end to the AES/EBU XLR input of the AI-1.

2.2B Connecting an S/PDIF Device
Digital routing to and from an S/PDIF device requires either fiber optic cables or RCA cables, since the AI-1 provides both these connectors. These connections can be made while power is on or off, and the components do not need to be turned on in any particular order. To connect an S/PDIF device: 1. Connect one end of a fiber optic cable into the S/PDIF optic output of the AI-1, OR, connect one end of an RCA cable to the S/PDIF RCA output of the AI-1 (depending on which connections are available on the S/PDIF device); 2. Connect the other end of the fiber optic cable to the optic input of the S/PDIF device, OR, connect the other end of the RCA cable to the RCA input of the S/PDIF device; 3. Connect one end of a fiber optic cable into the S/PDIF optic output, OR, connect one end of an RCA cable to the RCA output on the S/PDIF device;
4. Connect the other end of the fiber optic cable to the S/PDIF optic input, OR, connect the other end of the RCA cable to the RCA input of the AI-1. Note: Both the optic and RCA outputs are active when the AI-1s Destination is set to S/PDIF. This means you can route digital audio to two S/PDIF devices simultaneously. When the AI-1s Source is set to S/PDIF, the RCA input has priority over the optic input. If the AI-1 does not detect a device connected to the RCA input (no sample clock present), it will automatically switch over and use the optic input. Since the switch is determined by the presence of a sample clock, you could leave a device connected to the RCA input, and simply turn its power off when you wish to use the optic input.

2.KHZ CLOCK OUT

The 48kHz output signal is a 75 TTL level square wave output, and is provided via a BNC-type connector. If you are using the BRC Master Remote Control and plan to record onto ADAT from an AES/EBU or S/PDIF source, the 48kHz clock out must be connected to the BRC so that it can be synchronized with the sources clock rate.

tape on another ADAT, and you avoid having to reconnect your system.

3.0C Destination

To route the AI-1 to ADAT, set the AI-1s Destination to ADAT by pressing the DESTINATION ADAT button. The buttons LED will be lit indicating it has been selected.
3.0D Converting Sample Rate
If the source you are recording from is already using a 48kHz clock, the 48kHz DESTINATION RATE LED will be lit. This is the same clock that ADAT uses, so there is no need to convert the sample rate. If the sources clock rate is 44.1kHz, the 44.1kHz DESTINATION RATE LED will be lit indicating that the ADAT(s) will synchronize to the sources clock. You now have the option of converting the sources clock rate to 48kHz, or leaving it at 44.1kHz. Either may be done by pressing the 48kHz button (the 48kHz DESTINATION RATE LED will be lit, indicating it has been selected), or simply by leaving it alone (the 44.1kHz LED will remain lit). If the sources clock rate is something other than 48kHz or 44.1kHz, neither DESTINATION RATE LEDs will be lit, and no sample rate conversion will be permitted. In this case, the ADAT(s) will still synchronize to the incoming sources clock rate.

3.1 ADAT TO AI-1

The AI-1 can route up to two ADAT tracks at a time to other digital audio recording equipment from other manufacturers, including: multitrack digital recorders, hard disk recorders, digital effects devices, CD recorders and DAT machines. Since the ADAT digital bus is a proprietary multichannel interface, it is necessary to convert the digital audio of the optic bus into a standard that is compatible with other equipment. The two standards supported are AES/EBU and S/PDIF. It might also be necessary to convert the sample rate of the outgoing digital audio. The AI-1 can convert back and forth
between 48kHz and 44.1kHz.

3.1A Source

To route the ADAT to the AI-1, set the AI-1s Source to ADAT by pressing the SOURCE ADAT button. The buttons LED will be lit indicating it has been selected. Note: When the AI-1s Source is set to ADAT, the AI-1 links the ADAT optic input to the ADAT optic output, so that digital audio is routed from one ADAT to another. This means that, in a two ADAT system, it is possible to make a digital backup of all eight tracks of ADAT #2 to ADAT #1, while simultaneously routing two tracks from ADAT #2 to either an AES/EBU or S/PDIF device.
3.1B Selecting Source Tracks
You may select a pair of ADAT tracks by pressing one of the four ADAT CHANNEL buttons (1/2, 3/4, 5/6 or 7/8). If the AI-1s Destination is set to AES/EBU or S/PDIF, only one of these four buttons can be selected. If the Destination is set to ADAT, all four buttons LEDs will be lit indicating that all eight tracks may be transmitted/received.

3.1C Destination

To select the AI-1s output destination, press one of the three DESTINATION buttons (ADAT, AES/EBU or S/PDIF). The button will be lit to indicate it has been selected. Only one of the Destination buttons can be selected at a time. Note: The AI-1 provides two types of connectors for S/PDIF devices. When the Destination is set to S/PDIF, the digital audio will be sent out both S/PDIF outputs (fiber optic and RCA). Therefore, it is possible to route the AI-1s output to two S/PDIF devices simultaneously.

3.1D Converting Sample Rate
When the Source is set to ADAT, the AI-1s Destination Rate will automatically be set to 48kHz, since this is the sample rate of ADAT. If you wish to output the digital audio from the AI-1 at 44.1kHz, press the 44.1kHz DESTINATION RATE button (its LED will be lit). This can be used to route digital audio from ADAT to a DAT recorder or CD recorder which uses the lower sampling rate.

3.2 USING THE BRC

The Alesis BRC Master Remote Control can be used to control all of the AI-1s functions. The BRCs DIGITAL I/O button is used to activate and deactivate the AI-1 functions. When the DIGITAL I/O button is enabled, its LED will be lit and the current digital inputs can be recorded to ADAT (the analog inputs will be ignored). The type of digital input that is enabled by this button depends upon the type of digital input that is selected when this function is edited. If you access the BRCs Edit mode (by pressing the EDIT button) and select DIGITAL I/O, you can control the AI-1s parameters (Source, Destination, Destination Rate, and ADAT tracks to be sent out of the AI-1). However, the DIGITAL I/O button must be enabled for any changes you make to affect the AI-1. If you make changes to the AI-1s settings from the BRC while the DIGITAL I/O button is off, the AI-1 will automatically be updated the next time the DIGITAL I/O button is turned on, so that its setup concurs with the BRC.

3.2A Digital Input

To select the type of digital input on the BRC: 1. Press the DIGITAL I/O button to enable the digital bus (the DIGITAL I/O button LED will go on to indicate it is enabled); 2. Press the EDIT button (the EDIT button LED will go on to indicate you are in Edit mode); 3. Press the DIGITAL I/O button; The display will read: Digital input: ADAT
or Digital input: AES/EBU or Digital input: S/PDIF
4. Use the UP/DOWN buttons to select the digital input that is to be the source for recording: ADAT, AES/EBU or S/PDIF (the corresponding Source LED on the AI-1 will be lit to indicate the current selection); 5. To exit Edit mode, press the EDIT button (the EDIT LED will turn off). Note: If you change the Digital Input setting while the DIGITAL I/O button is off, the AI-1 will not reflect the newly selected digital input. However, the change will automatically be sent to the AI1 the next time the DIGITAL I/O button is turned on.
3.2B Bouncing Tracks Between ADATs
The BRC makes it possible to copy tracks between ADATs without leaving the digital domain. The BRC assumes you have connected the digital bus correctly between all ADATs in the system (see section 2.1C). Digital track bouncing is a feature available regardless of whether an AI-1 is connected, or not. If the DIGITAL I/O button on the BRC is pressed again when its digital input display reads "ADAT", you advance to the next window where you may select which track(s) will be routed to the digital bus, and thereby sent to any ADAT tracks that are in record when the DIGITAL I/O button is enabled on the BRC. This allows for digital track copying and backups. To digitally bounce tracks from the BRC: 1. Press the EDIT button (the EDIT button LED will go on to indicate you are in Edit mode); 2. Press the DIGITAL I/O button; The display will read:

Digital input: ADAT 3. Press the DIGITAL I/O button again while the digital input display reads ADAT; The display will show the following: Select source with trk buttons All the record and input track LEDs will turn off, as they no longer reflect the record/monitor status. The TRACK INPUT LEDs are now used to reflect the current source tracks. 4. Use the TRACK SELECT buttons to choose the source tracks (that is, the tracks to be assigned to the ADAT digital bus); To select a single source track, press the desired TRACK SELECT button. The track will now be enabled and its green Input LED will be lit. Pressing the same button again will disable that track and turn off the LED. You may now select a different track. If you select a track to be a source that was previously put into record-enable, it will automatically be taken out of recordenable. Once a track has been selected as a source, it cannot be put into record-enable while the DIGITAL I/O button is turned on. If multiple track sources are desired, they must come from the same tape machine. This is because when one track is chosen, the entire machine becomes the transmitter, while all other connected ADATs become receivers. Only one ADAT can transmit over the digital bus at any given time. When a track is selected as a source, any tracks from other machines that were previously enabled as sources will be disabled automatically. If no source tracks are selected, the ADATs digital outputs will function as digital through connections. This allows for another digital audio device which uses the ADAT proprietary digital multichannel bus, such as the Alesis QuadraSynth, to be connected to the first ADATs digital input and thus recorded
onto any ADAT connected to the digital bus. 5. Press the EDIT button to exit Edit mode; 6. Press the DIGITAL I/O button to enable the digital bus (the DIGITAL I/O LED will go on to indicate it is enabled); 7. Use the TRACK SELECT buttons on the BRC to record-enable the destination tracks; 8. Initiate recording on the BRC. The source tracks will be recorded onto the destination tracks in ascending order. Example: If source tracks 1, 2, and 3 are selected and tracks 12, 17, and 24 are record enabled, then track 1 will be copied to track 12, track 2 to track 17, and track 3 to track 24. If more destination tracks are selected than source tracks, the source tracks will repeat (cycle). Example: If tracks 25 and 29 were added to the destination tracks of the previous example, then track 1 would be copied to track 25, as well as to track 12, and track 2 would be copied to track 29, as well as track 17. This type of scheme also allows for copying a single track to multiple tracks. A digital source track cannot be selected as a digital destination track (i.e. digital source tracks will not be allowed to be record enabled when DIGITAL I/O is enabled). When copying digital tracks, any track delays and machine offsets will be in effect.

with the incoming source. However, it is important to note that the BRC also requires a 48kHz clock in order to be synchronized to the incoming digital signal (see section 3.2D). Since the BRC has nothing to do with the ADATs optic digital bus, you will need to route clock information from the AI-1 to the BRC by connecting the AI-1s 48kHz output to feed the BRCs 48kHz input (see section 2.1C). 9. Press the EDIT button to exit Edit mode (the EDIT LED will turn off); 10. Use the TRACK SELECT buttons on the BRC to record-enable the destination tracks; 11. Initiate recording on the BRC. The source tracks will be recorded onto the destination tracks in ascending order (see previous section 3.2B regarding the guidelines for selecting record tracks).

3.2D BRC Synchronization

It is important that, when recording from AES/EBU or S/PDIF, the BRC is receiving synchronization information from the AI-1s 48kHz clock out. When recording onto ADAT from an AES/EBU or S/PDIF source, the BRCs 48kHz, SMPTE, and MIDI outputs will not be usable if no timing reference is provided by the AI-1. While the BRC is synchronizing to the AI-1s 48kHz clock, all of the BRCs sync outputs will be usable. However, it is up to you to insure that the AES/EBU or S/PDIF digital audio signal is synchronous to the clock source that is connected to the BRC by providing it with clock information. When the DIGITAL I/O button is turned on and the digital input has been set to either AES/EBU or S/PDIF, the EXT SYNC button on the BRC will automatically turn on and disable the pitch controls (the Pitch display will read ). The EXT SYNCs clock source will be set to 48kHz. It is possible, however, to disable the EXT SYNC button by pressing it without turning off the DIGITAL I/O button. This is not recommended, since the BRC would no longer be in perfect sync with the digital sources clock rate, which could
result in clicks in the audio. For more information on 48kHz clock, see sections 2.1C and 2.3.
3.2E Output ADAT Tracks to AI-1
If the BRC is in Edit mode (the EDIT button is lit), and the DIGITAL I/O button is pressed a third time when the Digital Input is set to "ADAT", (or if it is pressed a second time when set to "AES/EBU" or "S/PDIF"), you may select the source tracks that will output to the AI-1. When the DIGITAL I/O button is pressed again, you may select the AI-1 destination, which can be either ADAT, AES/EBU or S/PDIF. You may also set the destination clock rate for the AI-1 to either 48kHz or 44.1kHz, thus performing sample rate conversion. To route ADAT tracks to the AI-1 from the BRC: 1. Press the EDIT button (the EDIT button LED will go on to indicate you are in Edit mode); 2. Press the DIGITAL I/O button; 3. Use the UP/DOWN buttons to select ADAT as the Digital Input you wish to use as a source for recording; 4. Press the DIGITAL I/O button twice; The display will show the following: Select tracks to output to AI-1 All the record and input track LEDs will no longer reflect the record/monitor status. The TRACK INPUT LEDs will now reflect the current source tracks to be output to the AI-1. 5. Use the TRACK SELECT buttons to select the tracks to output to the AI-1; To select a single source track, press the desired TRACK SELECT button. The track will now be enabled and its green LED will be

after it. However, it is important to note that even though the AI-1s destination may be set to AES/EBU or S/PDIF, it is still sending all eight channels of the source ADAT back to the first ADAT in the chain. Therefore, it is possible to bounce tracks from the source ADAT onto the same track numbers on the first ADAT, while simultaneously routing two tracks from the source ADAT through the AI-1 to an AES/EBU or S/PDIF destination.

3.3 CONFIGURATIONS

The ADAT CHANNEL buttons, the DESTINATION RATE buttons, and the SOURCE and DESTINATION buttons define the possible uses of the AI-1. Here are the various configuration possibilities for a two ADAT system.
3.3A ADAT to AES/EBU (48kHz)
In this configuration, the ADAT optic jacks and the AES/EBU XLR jacks are used. In the figure below, ADAT #2 is transmitting to an AES/EBU device using a 48kHz sampling rate. The proper control settings for this operation are as follows: Source = ADAT Destination = AES/EBU Destination Rate = 48kHz Figure 5
Note: Even when the AI-1s destination is set to AES/EBU, the digital bus being received from the last ADAT is routed through back to the first ADAT. Therefore, it is possible to bounce audio from the last ADAT back to the first ADAT, while simultaneously routing two tracks from the last ADAT to an AES/EBU device.
3.3B AES/EBU to ADAT (48kHz)
In this configuration, the ADAT optic jacks and the AES/EBU XLR jacks are used. In the figure below, ADAT #1 is receiving from an AES/EBU device using a 48kHz sampling rate. The proper control settings for this operation are as follows: Source = AES/EBU Destination = ADAT Destination Rate = 48kHz Figure 6
3.3C AES/EBU to ADAT (44.1kHz to 48kHz)
In this configuration, the ADAT optic jacks and the AES/EBU XLR jacks are used. In the figure below, ADAT #1 is receiving from an AES/EBU device using a 44.1kHz sampling rate being converted to 48kHz. The proper control settings for this operation are as follows: Source = AES/EBU Destination = ADAT Destination Rate = 48kHz Figure 7
3.3D ADAT to AES/EBU (48kHz to 44.1kHz)

In this configuration, the ADAT optic jacks and the AES/EBU XLR jacks are used. In the figure below, ADAT #2 is transmitting to an AES/EBU device using a 44.1 kHz sampling rate. The proper control settings for this operation are as follows: Source = ADAT Destination = AES/EBU Destination Rate = 44.1kHz Figure 8
3.3E AES/EBU to ADAT (44.1kHz)
In this configuration, the ADAT optic jacks and the AES/EBU XLR jacks are used. In the figure below, ADAT #1 is receiving from an AES/EBU device using a 44.1kHz sampling rate without conversion. The proper control settings for this operation are as follows: Source = AES/EBU Destination = ADAT Destination Rate = 44.1kHz Figure 9
3.3F ADAT to S/PDIF (48kHz)
In this configuration, the ADAT optic jacks and the S/PDIF jacks are used. In the figure below, ADAT #2 is transmitting to an S/PDIF device using a 48kHz sampling rate. The proper control settings for this operation are as follows:
Source = ADAT Destination = S/PDIF Destination Rate = 48kHz Figure 10
Note: Even when the AI-1s destination is set to S/PDIF, the digital bus being received from the last ADAT is routed through back to the first ADAT. Therefore, it is possible to bounce audio from the last ADAT back to the first ADAT, while simultaneously routing two tracks from the last ADAT to an S/PDIF device.
3.3G S/PDIF to ADAT (48kHz)
In this configuration, the ADAT optic jacks and the S/PDIF jacks are used. In the figure below, ADAT #1 is receiving from an S/PDIF device using a 48kHz sampling rate. The proper control settings for this operation are as follows: Source = S/PDIF Destination = ADAT Destination Rate = 48kHz

Figure 11

3.3H S/PDIF to ADAT (44.1kHz to 48kHz)
In this configuration, the ADAT optic jacks and the S/PDIF jacks are used. In the figure below, ADAT #1 is receiving from an S/PDIF device using a 44.1kHz sampling rate being converted to 48kHz. The proper control settings for this operation are as follows: Source = S/PDIF Destination = ADAT Destination Rate = 48kHz Figure 12
3.3I ADAT to S/PDIF (48kHz to 44.1kHz)

Figure 16

3.3M S/PDIF to S/PDIF
In this configuration, either the S/PDIF fiber optic jacks or RCA jacks (or both) are used to connect two S/PDIF devices through the AI-1. In the figure below, S/PDIF device #1 is connected to the RCA jacks of the AI-1, while S/PDIF device #2 is connected to the fiber optic jacks. This scenario would only occur when you wished to use the AI-1 to perform sample rate conversion between the source and destination devices. The proper control settings for this operation are as follows: Source = S/PDIF Destination = S/PDIF Destination Rate = 48kHz or 44.1kHz (opposite from the sources sample rate) Figure 17

CHAPTER 4: APPENDICES

4.0 APPENDIX 1: SPECIFICATIONS
Number of Digital Audio Channels: ADAT: AES/EBU, S/PDIF: Sample Clock Input range: Digital Inputs/Outputs: Connectors:
48 kHz nominal. User variable from 50.8 to 40.4kHz (+1, -3 semitones). Four EIAJ fiber optic jacks (2 inputs, 2 outputs); two RCA connectors (1 input, 1 output); two XLR connectors (1 input, 1 output) Alesis Fiber optic Multichannel (8 tracks); AES/EBU (2 channels); S/PDIF (2 channels) Push buttons with LED indicators for ADAT Channel (1/2, 3/4, 5/6, & 7/8), Destination Rate (48kHz, 44.1kHz), Source and Destination (ADAT, AES/EBU, S/PDIF); AC power switch Two 9 pin D-Sub connectors for Sync In and Sync Out; Four EIAJ fiber optic jacks for ADAT Digital In and Out and S/PDIF Digital In and Out; Two RCA jacks for S/PDIF In and Out; Two XLR connectors for AES/EBU Digital In and Out; One BNC connector for 48kHz Word Clock Out; IECspec AC cord connector. 90-250 VAC, 5060 Hz, 50 W max.
Communications Protocol: Front Panel Controls and Indicators:
Rear Panel Controls and Connectors:

Power Requirements:

Dimensions (H x W x D): Weight: Shipping Weight: Accessories Included: Optional Accessories:
1-3/4" x 19" x 6-1/4" 4.5 lbs (2 kg) 7 lbs (3.1 kg) IEC style AC power cord Owners Manual RMB Remote Meter Bridge BRC Master Remote Control
4.1 APPENDIX 2: MAINTENANCE/SERVICE INFORMATION

4.1A Cleaning

Disconnect the AC cord, then use a damp cloth to clean the AI-1s metal and plastic surfaces.

4.1B Maintenance

Here are some tips for preventive maintenance: Periodically check the AC cord for signs of fraying or damage. Unplug the AI-1 when not in use for extended periods of time.

1.0 ABOUT AI-2

The AI-2 is an extremely flexible and powerful interface device for the ALESIS ADAT 8-track digital audio tape recorder. The AI-2 is designed and manufactured for ALESIS by TimeLine, the world leader in machine control and synchronization systems. The AI-2 provides a universal ADAT control interface allowing a bank of ADAT recorders to be controlled from a video editor, a tape machine synchronizer system or in time code chase. The AI-2 supports four primary input control and two output control modes. The input control modes provide an interface to external controllers, while the output modes allow control of up to 16 ADAT recorders, with or without the Alesis BRC Remote Control.
Sample Accurate Syncing Capabilities. Using ADAT's exclusive Proprietary Synchronization interface, the AI-2 can control up to 16 ADAT's, for a total of 128 tracks, and lock them together in perfect synchronization with other time code controlled devices. Easy And Familiar Front Panel Controls. The AI-2 is fitted with a Liquid Crystal Display (LCD), 6 keys and a bank of status LED's. The keys are used to setup AI-2 system operation parameters, to select display information and to edit and control AI-2 functions. The 8 LEDs give constant control and communication status, indicating correct operation. The AI-2 controls have been designed to be quick and simple to use and will be familiar to all studio operators. Simple Installation. AI-2 installation is extremely simple, the AI-2 is a 1 Unit high product which is designed to fit into an industry standard 19" wide rack. All interface connections are made with standard connectors and the AC supply is a convenient wall mounting transformer. Connection to the AI-2 in its basic form is accomplished by a 9-pin sync cable, which connects to the first ADAT in the system and a cable to the selected controller. Successive ADATs are connected in turn -- sync out to sync in -- using the same 9-pin style connector. When the AI-2 is turned on, it automatically becomes the system master and assigns each ADAT an identification number (ID) from first to last, in the chain. The AI-2 then checks to see which machines have tapes installed and automatically locates the slave ADAT tapes to the master position.

1.2 OVERVIEW OF MAIN FUNCTIONS
The AI-2 is an extremely complex and sophisticated interface that has been designed to handle the demands of multitrack studio recording and the post production process. Here is a brief rundown of the AI-2s main functions.
1.2A Multiple Control Methods
The AI-2 allows multiple ADAT transports to be operated by a number of external controls or synchronization devices. The AI-2s Control menu lets you select the controller, or if set to AUTO, will detect which controllers are connected and communicating and automatically switch. The AI-2 also allows simultaneous communication with a MIDI sequencer or controlling device.
1.2B Control of ADAT Functions
The AI-2 lets an external controller take control of many of the ADAT functions. All basic transport functions, including Digital input, All input and Auto input, can be controlled from the AI-2. The AI-2 also allows remote control of all 128 possible Track enables and when used with a video editor the AI-2 TRACKS menu provides comprehensive track mapping functions.
Optional-See Section 3.2 ALESIS BRC

VIDEO EDITOR

VIDEO REFERENCE EXT WORD CLOCK

Time Code Word Clock

CAPTURE

SET/HOLD

MULTIPURPOSE AUDIO/VIDEO SYNCHRONIZATION INTERFACE

DISPLAY

ONLINE

NON STD

BRC/ADAT

CONTROL

DOWN CLEAR

Time Code Chase Control

When using BRC with AISync connection is from BRC to ADATs

AUDIO OR VIDEO TRANSPORT

TRANSPORT LTC VITC SER PILOT TACH REC REH LOCK RESOLVE ONLINE 30 DF RMT BWL VARI H M SPEED L FILM VITC GEN RDR SYNC PT OFFSET ERR 29.DF 25 24

MIDI COMPUTER

GENERATOR JAM TC JAM UB TACH N/STD ON INT VID AUX MAINS RDR VSO 422 GEN

TIMELINE SYNCHRONIZER

MASTER ADAT

SLAVE ADAT

REWIND

FAST FWD

RECORD

AI2022A

Sync In

Sync Out

1.2C Reading and Saving Data
The AI-2 can read and save session data to the ADAT tape header or to external MIDI devices. This means that each time a new ADAT tape is put in the machine the AI-2 will be able to read all the associated Cue or Song times and you will be able to synchronize the tapes, effortlessly.

1.2D Reference Select

AI2021A

9-12V AC Power Connector Video Input BNC Connector
Word Clock Input BNC Connector

Editor 9 Pin D Connector

MIDI In/Out 5 Pin Din Connector Lynx-2/Micro Lynx Synchronizer 25 Pin D Connector
BRC MIDI 5 Pin Din Connector
Sync Out 9 Pin D Connector Generator Out 1/4" TRS Jack
Eight Position Configuration Switch

3.0 AI-2 INTERFACING

The AI-2 is designed to quickly and effectively integrate the Alesis ADAT digital audio tape recorders into studio and post production facilities. The AI-2 can be used for a wide range of applications, from basic chase synchronization to full control of 16 ADAT transports from a video editor. The first diagram shows a generic configuration, indicating a number of possible applications.

AI-2 APPLICATIONS

VIDEO EDITOR ALESIS BRC Optional-See Section 3.2
VIDEO REFERENCE EXT WORD CLOCK ALESIS AI-2

REFERENCE

PUNCH IN/OUT LOCATE/PLAY

SMPTE IN

SMPTE OUT

48 kHz IN

48 kHz OUT VIDEO SYNC IN

MIDI IN

MIDI OUT

REMOTE OUT TO ADAT

90-250 VAC 50-60 Hz

POWER ON/OFF

BRC ADAT GEN OUT W/C OUT SYNC OUT THRU
CONTROL MIDI VID IN EDITOR LYNX-2 / MICRO LYNX IN OUT IN MIDI OUT

S/N POWER CONFIG

RDR IN

W/C IN

When using BRC with AI-2, Sync connection is from BRC to ADATs
TRANSPORT LTC VITC SER PILOT TACH REC REH LOCK RESOLVE ONLINE 30 DF RMT BWL VARI H M SPEED L FILM VITC GEN RDR SYNC PT OFFSET ERR 29.DF GENERATOR JAM TC JAM UB TACH N/STD ON INT VID AUX MAINS RDR VSO 422 GEN
10 dBV ANALOG INPUTS +4 dBu ANALOG OPTICAL DIGITAL DIGITAL INPUT OUTPUT 10 dBV ANALOG OUTPUTS 7 8
OUTPUT FOOTSWITCHES LOCATE/PLAY LRC REMOTE PUNCH IN/OUT IN SYNC OUT METER BRIDGE
POWER REQUIREMENTS 90-260 VAC 50-60 Hz 50 WATTS MAX

AI2019A

3.1 INTERFACING TO ONE OR MORE ADAT'S
The AI-2 is used to connect one or more ADATs to a control system. The basic ADAT connection is shown here. When the AI-2 is powered on it takes control of the ADAT chain and automatically assigns machine IDs to the connected ADATs. Although by itself the AI-2 cannot control the ADAT chain, if a reference source is connected to the AI-2, when the ADAT transports are put into play locally, the speed of the transports will be resolved to the selected reference by the AI-2. Connect a standard Alesis ADAT interconnect cable between the AI-2 9-pin SYNC OUT connector and the SYNC IN connector of the "master", or first, ADAT. Connect additional ADATs, SYNC OUT to SYNC IN as described in the ADAT reference manual.

CONTROLLING ONE OR MORE ADAT'S (BASIC INTERFACE)

BRC THRU GEN OUT W/C OUT

ADAT SYNC OUT
10 dBV ANALOG INPUTS +4 dBu ANALOG OPTICAL DIGITAL DIGITAL INPUT OUTPUT 10 dBV ANALOG OUTPUTS INPUT

AI2007A

When all the connections have been made, and the units powered on, the BRC/ADAT LED on the front panel of the AI-2 should be illuminated, to indicate that valid communication is occurring between the AI-2 and the ADAT units. If the LED does not light (no communications) or is flashing (communication taking place, but with errors) then recheck the cable connections.
3.2 INTERFACING TO THE BRC REMOTE CONTROL
The AI-2 can be used to control one or more ADATs through the BRC, this allows an "ADAT system" to be connected to a machine control system or video editing system. The AI-2 communicates with the control system and the BRC which can be used to provide such features as track enable buttons and MIDI song tempo mapping. The basic connections are shown below. Connect the cables between the AI-2 BRC connector section and the BRC. Two standard MIDI cables from AI-2 MIDI IN to BRC MIDI OUT, and from AI-2 MIDI OUT to BRC MIDI IN. A standard BNC to BNC coaxial cable from AI-2 W/C OUT to BRC 48 KHz IN and a mono or stereo jack plug to jack plug cable from AI-2 GEN OUT to the BRC SMPTE input. Connect the BRC REMOTE OUT TO ADAT connector to the SYNC IN on the first ADAT transport.

CONTROLLING THE BRC

Time Code Word Clock MIDI MIDI ALESIS BRC
PUNCH IN/OUT LOCATE/PLAY SMPTE IN SMPTE OUT 48 kHz IN 48 kHz OUT VIDEO SYNC IN MIDI IN MIDI OUT REMOTE OUT TO ADAT 90-250 VAC 50-60 Hz POWER ON/OFF

AI2011A

Note, that the ADAT SYNC OUT connector on the AI-2 rear panel is unconnected for this mode of operation. When all connections have been made, and the units powered on, the BRC/ADAT LED on the front panel of the AI-2 should be illuminated, to indicate that valid communication is occurring between the units. If the LED does not light (no communications) or is flashing (communication taking place, but with errors), then recheck the cable connections.

DIGITAL TRANSFER WITH THE AI-1
Word Clock In Digital I/O Digital I/O MASTER ADAT
10 dBV ANALOG INPUTS +4 dBu ANALOG OPTICAL DIGITAL DIGITAL INPUT OUTPUT dBV ANALOG OUTPUTS 7 8
10 dBV ANALOG INPUTS 8 +4 dBu ANALOG OPTICAL DIGITAL DIGITAL INPUT OUTPUT 10 dBV ANALOG OUTPUTS 7 8

ALESIS AI-1

48kHz OUT IN ADAT OUT IN SPDIF OUT IN SPDIF OUT IN AES/EBU OUT SYNC OUT

SYNC IN

60-250 VAC 50-60 Hz

AI2018A

As for all the previous methods of operation, when using external references similar precautions apply. The reference signals must be locked together. The word clock signal from the AI-1 is derived from the incoming digital audio data, this must therefore be locked to the video or synchronizer reference for the system to operate correctly.

4.0 POWER ON PROCEDURE

Each time the AI-2 is powered up it runs through a series of initialization tests and displays the current configuration. The power on routine tests all front panel for two seconds and then runs through the following display sequence where the AI-2 configuration is displayed in approximately one second steps. If it necessary to reset the AI-2 to default parameters, then press and hold the STORE key when the power is turned on.
C L E A R I NG ME M Only displayed when the STORE key is held on power up to reset the AI-2.
A LE S I S A I - 2 ad a t I n t e r f ac e

Model and Manufacturer

B y T i me L i n e
So f t wa r e Ve r s i o n A I 2 - 0 01

V i de o

Video sync source detected if connected Displays "Not Used" if the selected reference is not external video, or "Not available" if the AI-2 does not detect video sync.
V i de o Sy n c Ge n = On
Indicates that a TimeLine internal video sync generator card (VSG) is fitted, and its current status.
ad a t Re f e r e nc e E x t V i d
Displays the selected speed reference source.
S a mp l e R a t e 4 8. 0K Co n t r o l
Displays the selected sample rate.
Displays the selected control method.

S ON Y

SA VE SYS EX S TORE TO CON F I RM
The save data to tape process is not accessed through the Setup Command menu, but directly from a front panel key. To save data to tape, press the SAVE key and the STORE key to confirm. Only one command can be set at a time, because these commands are considered potentially "destructive" operations. If a command is canceled by pressing the DISPLAY key the Setup Command menu, Data option will be reset to off. All commands that are used to read or write data, require confirmation with the STORE key as a loss of valuable information could occur.

5.3B Save To Tape

Writes AI-2 data to the ADAT tape header. This command must be confirmed by pressing the STORE key as a loss of information could occur. If performed after a clear header, writes only SMPTE start times, and Tape start times, All Safe, X-fade time, Auto input, All input, Digital input, Track delay, and Pitch Control status and the Pitch value. If performed after a read tape operation will write all original unchanged data back to tape with any new changes that you have made. Data is written to all connected ADAT transports and all previously recorded data will be overwritten. To PREVENT loss of any information a Read Tape operation must previously have been performed.

5.3C Read Tape

Reads data from the first ADAT tape header. This command must be confirmed by pressing the STORE key as a loss of information could occur. The AI-2 reads and stores every piece of data in the ADAT tape header, even information that the AI-2 does not require. This permits a future Save Data operation to rewrite to tape all the original information. The AI-2 will load and use SMPTE start times, Tape start times, All Safe status, X-fade time, and Pitch Control value and status.

5.3D Clear Header

Resets the AI-2 internal header information to the AI-2 system defaults. This command must be confirmed by pressing the STORE key as a loss of information could occur. All information read from tape will be lost. This feature is used to ensure that data from a previous tape is not written to a new tape. It is recommended that a Clear Header operation be performed at the start of a new session, when there is no data on tape to read.
5.3E Abort Data Read or Save
This command is used to stop a tape or MIDI data save or read operation, once it is in progress. The command must be confirmed by pressing the STORE key. When aborting a save operation, no data will be lost, as the AI-2 retains the original data in memory. Aborting a read operation could result in invalid data in the AI-2.

Default

Reader Chase
5.11A External Word Clock Reference
The AI-2 sample rate and time code are derived from an external word clock present at the W/C in connector and one of the three "secondary" frame reference signals described below, Lynx synchronizer, video or internal. Word clock by itself does not contain frame information so the AI-2 will derive its frame rate reference by bringing its time code frames into alignment with one of the secondary references. For this reason three word clock reference selections are provided. When operating with an external word clock reference, IT IS ESSENTIAL THAT THE EXTERNAL WORD CLOCK AND FRAME REFERENCE ARE SYNCHRONIZED TO EACH OTHER. If this is not the case, then program material recorded on the ADAT will drift relative to time code. For this reason, THE W/C IN CONNECTOR SHOULD BE USED WITH CAUTION.

5.11B Lynx Reference

The AI-2 sample rate and time code are referenced to a special frame reference signal, provided for the AI-2 by the synchronizer, at the LYNX-2/MICRO LYNX connector. This signal ensures that the AI-2 will always be correctly synchronized with the frame reference of the synchronizer system. If the synchronizer system reference is changed, the AI-2 will automatically lock to and run at the new reference rate.

5.11C Video Reference

The AI-2 sample rate and time code are referenced to a video sync signal present at the VID IN connector. When selected, the internal time code frame rate and the digital audio sample rate will be derived from this video signal. The AI-2 automatically detects and switches between NTSC (29.97 frames-per-sec) and PAL (25 frames-per-sec).

5.11D Internal Fixed

The AI-2 sample rate is referenced to the AI-2 internal crystal. The frame rate to sample rate relationship is determined internally and then mathematically maintained by the AI-2 so the time code and ADAT transport are always perfectly synchronized.

5.11E Internal Variable

The AI-2 sample rate and time code are derived from a variable internal reference which is adjustable in one cent steps. The AI-2 displays the pitch variation in cents and an equivalent speed percentage read out. The range available at 48 KHz is from +100 to -300 cents. The range at other sample rate frequencies will be different, but consistent with the speed variation limits of the ADAT transport. Internal variable can be used when the ADAT chain is the master transport in a system and it is necessary, for production reasons, to run off speed.

sync video signal at video black level locked to the AI-2 system reference. If the option card is on then the AI-2 video input BNC is used as a video output and may be connected to the sync input of a VTR or other transport that needs to be reference to the ADAT system.

6.5G Status Menu

The Status menu has three items the number of connected ADATs, the external word clock rate and the reader code type.
Menu STATUS Submenu Connected 1-16 Ext W/C XX.XXXK Rdr In Code: 30/DF/25/24 Option Description Status Only Connected ADAT slave count. Status Only Measured external sample rate 5 Hz. Status Only Reader input code type.
Connected. Displays the number of ADAT transports connected to the AI-2. External Word Clock. Displays the sample rate of the external word clock connected to the W/C in connector. Reader Input Code. Displays the code type being read at the reader input.

6.5H System Menu

The System menu has two menu items, display contrast and software version
Menu SYSTEM Submenu Contrast: Ver: Option 10-100% "AI2 001" Description Display contrast default 70%. Adjusts in 10% steps. AI -2 software version. Status only.
Contrast. Used to adjust the AI-2 LCD display contrast. Version. Displays the current AI-2 software version.

6.5I Tracks Menu

The tracks menu is used to select the track control method and to allocate or map tracks to editor track enables. The highest track available for track mapping is determined by the number of ADATs connected. If a track previously mapped is no longer available because the number of ADATs connected has been reduced then the selected tracks will flash to indicate that they are invalid. Track mapping is only available when the AI-2 control source is set for SONY editor control.
Menu TRACKS Submenu All safe: Sel: Option Off On Editor Map Lynx/MMC Local Mapping Single A1-A2 A1-A4 Da1-Da8 Map to: Default Use track mapping assignments. TimeLine Ext controller or MMC. Track enable at machine front panel. Any selected audio track. A1/A2 to odd/even pairs, (default) Any group of 4, 1-4 etc. Any group of 8, 1-8 etc. Mapping table determined by mapping variable above as follows, default to lowest numbered selection. Single Odd/Evn Grp of 4 Grp of 8 Rec Src: Any AudOnly A1 A2 A3 A4 Vid 1, 2, 3,., 128 1-2, 3-4, 5-6,., 127-128 1-4, 5-8, 9-12,., 125-128 1-8, 9-16, 17-24,., 121-128 Determines editor track source for local track selection. Any track record enabled. Any audio track record enabled. Description

All Safe. Used to put all ADAT tracks into safe. Any track mapping configuration will be retained. Faster lock times can be achieved if the AI-2 is set to all safe, this of course is only possible if it is not intended to record on the ADAT transports.
Selection. Used to determine the track control method. The selections are editor control, Lynx control (which is also used for MMC track control), and local at the front panel of the ADAT transports. Mapping. The mapping option determines the operation of the following map to, track assignment selection. Single tracks, pairs of tracks or groups of four or eight can be selected. When using Da1-Da4 track enables from the editor the AI-2 automatically maps these to A1-A4 Map To. Used to select the track or groups of tracks that are mapped to the editor record enables. The track allocation method is determined by the mapping option selection. Record Source. If the track select mapping control is set to local then the record source selection determines the editor track enable for issuing the record command to the ADATs. This allows a single track enable to put multiple tracks selected on the front panel of the ADAT transports into record.
Chapter seven contains information on a number of features or procedures that are not covered in other sections of the manual. Some of the information in the chapter has been included for completeness and should not be considered an advanced feature.

7.0 ADAT DIGITAL INPUT

The AI-2 ADAT menu digital input option is used to select the transports input audio source. When set to on all the ADAT transports are set to digital input and the ADAT transport will use the fiber optic digital input. Do not select the digital input if it is not connected. When digital input is selected the ADAT speed reference is derived from the optical digital bus which must be locked to the AI-2 for correct operation. See the AI-2 Applications section for information on digital audio transfer, also refer to the AI-1 Reference manual.
7.1 AI-2 DISPLAY INFORMATION
In some special cases the AI-2 time code display shows a different time code value or is calculated from different time code registers. These special cases are covered below.

EXTERNAL MIDI INTERFACING

AI2017A

MIDI Commands 1. MIDI Machine Control (MMC) 2. Feed through to BRC 3. AI-2 Commands
MIDI Responses 1. MIDI Machine Control (MMC) Responses 2. BRC Responses 3. AI-2 Responses 4. MIDI Time Code (MTC)
Note: Will operate simultaneously with RS422 or Lynx-2 control.

7.3C MIDI SysEx

The AI-2 can be interfaced to external MIDI storage devices, the BRC, or another AI-2, for transferring setup information. This MIDI data can be used to set up the AI-2 menus. The read and save data transfer options are set in the commands menu and when saving selected data is specified in the MIDI menu. The AI-2 also has an Auto SysEx read mode command that can be used to automatically overwrite the AI-2 header information,
whenever SysEx information is transmitted to the AI-2 MIDI IN connector.
7.4 REAR PANEL CONFIGURATION DIP SWITCHES
Switch 1. Is used to configure the AI-2 so that after a memory clear the default settings will initialize for 25 frame operation. Once the AI-2 is configured the selected options will be retained in battery ram and used each time the unit is powered up. Switch 2. Is used to remove internal tape length limit checking. The AI-2 assumes that the length of an ADAT tape will be less than one hour. If tapes become available that have extended play times that exceed one hour, use this switch to disable limit checking. Switch 3. When the AI-2 powers up the display steps through a configuration information sequence. Use this switch to defeat the sign on information and jump straight to the normal time code display. Switch 4. Use this switch if it is necessary to prevent an operator from making inadvertent changes to the AI-2 setup. The switch makes Setup mode read only, by inhibiting the DOWN and UP editing keys. If this option is used, consideration should be given to the fact that submenu options that are set to auto will change when operating conditions change. To prevent this from occurring menu options set to auto should be set to specific modes of operation. Switches 5 & 6. Are used to determine the device numbers for the MIDI machine control interface. The default MIDI address is 00, if this is being used by another device in the MIDI system then an alternative MIDI assignment can be selected as follows.

SW 5 OFF ON OFF ON

SW 6 OFF OFF ON ON
MIDI Device ID 00 hex 29 hex 49 hex 69 hex
Switches 7 and 8. Are not currently implemented and have been reserved for future use.

7.5 EXT WORD CLOCK

The AI-2 will measure the frequency of an external word clock reference and display the measurement in the status menu. The AI-2 measurement has an accuracy of 5 Hz and is intended for information and troubleshooting purposes only.
7.6 INTERNAL VARI REFERENCE

When the AI-2 is selected as master in a synchronizer system. the AI-2 internal variable reference can be used to run ADAT transports off speed. Select Int Var in the reference menu and then use the Var option to set the speed variation. The speed variation range is nominally -300 to +100 cents at 48.000 KHz, which is the same as the ADAT pitch range. The AI-2 display shows the pitch variation and the equivalent speed variation percentage. This range will be different when other sample rates are selected. To indicate when the ADATS are not running at normal play speed, the AI-2 will turn one of the pitch control LEDS on the front panel of the ADAT on.

7.7 GENERAL INFORMATION

7.7A Tape Header Information
The AI-2 can read and save setup and cue information to the ADAT data header. When saving information the AI-2 writes to all ADAT tapes, so it will not matter which machine the tapes are put in at a future session. When reading information the AI-2 reads from the master ADAT transport, machine number one only.

7.7B Offline

The OFFLINE key is used to release all ADAT transports from AI-2 control. The master ADAT will automatically assume control of the slave ADATs. Individual machines in an ADAT chain can be taken "offline" by ejecting the ADAT tape. The AI-2 will detect when a tape is ejected and if necessary automatically reassign the master transport. Do not power down transports in the ADAT chain to take them offline, this will prevent communication with ADAT transports further down the chain.

7.7C Assemble mode

When controlling ADAT transports from a video editor or synchronizer controller in assemble edit mode the AI-2 will automatically put the ADATs in to format extend as each edit is assembled.
8.0 APPENDIX 1: SPECIFICATIONS

8.0A Operating Codes

SMPTE (30 fps NDF) SMPTE (29.97 fps NDF) SMPTE Drop Frame (30 fps DF) SMPTE Drop Frame (29.97 fps DF) EBU (25 fps) Film Code (24 fps) Generator Output Signal Output Level Output Impedance Signal Rise Time Time Code Stability Unbalanced 1 Vpp fixed 330 ohms 4 microseconds 2 microseconds max.

8.1D External Word Clock

The AI-2 will accept a 48k 5V TTL external word clock signal. The word clock should ideally be supplied by a high quality digital reference generator. A constant stable word clock reference is required for communication between the AI-2 and the ADAT transports. If word clock is selected as the AI-2 reference source and the reference is not connected, stops or is interrupted then the ADATs will drop off line. For correct operation the word clock must be synchronous with the system frame rate or the ADATs will drift out of sync. The AI-2 word clock frequency range is restricted to the operational range of the ADAT transport, from 40.363 KHz to 50.854 KHz. It is strongly recommended that the word clock signal has a 50% duty cycle. If the input does not have a 50% duty cycle then the word clock must be high for a period that is greater than 2 usecs and less than 14 usecs. If the external word clock exceeds the ADAT transport control limits, then the AI-2 will display a "S/R Out of Range" warning message.

8.1E Internal Word Clock

The AI-2 has a word clock generator that is used to control the speed of the ADAT transports except when using an external word clock reference. The internal generator has been specifically designed for use with ADAT transports and the BRC. The AI-2 word clock output was not intended for use as a studio reference generator and in some circumstances may be unsuitable as a word clock source.
8.2 APPENDIX 3: MAINTENANCE/ SERVICE INFORMATION

8.2A Cleaning

First, turn the unit off and disconnect the AI-2 wall mounting power supply. Use a damp cloth, with a mild detergent to clean the front panel of the AI-2. Under no circumstances use an abrasive cleaner or chemical solvent, this will damage the front panel finish.

8.2B Maintenance

The AI-2 is a solid state device that will give a life time of service with no maintenance. To keep the AI-2 looking as good as new, periodically clean the front panel.

8.2C Servicing

If problems occur, check the cables between the AI-2, controller and ADAT transports, also refer to the Troubleshooting Guide and Error Messages listed in Appendix Four. There are no fuses inside the AI-2, if the unit fails to power up, try replacing the wall mounting power supply with a similar 9-12 volt AC supply. DO NOT ATTEMPT REPAIRS YOURSELF. THERE ARE NO USER SERVICEABLE PARTS INSIDE THE AI-2. REFER ALL SERVICING TO TIMELINE. YOU MUST FIRST CONTACT TIMELINE CUSTOMER SERVICE TO OBTAIN AN RMA NUMBER (Return Authorization Number) BEFORE THE UNIT IS RETURNED TO TIMELINE. UNITS RETURNED TO THE FACTORY WITHOUT RMA NUMBERS WILL BE SUBJECT TO UNNECESSARY DELAYS. For International service contact your local Alesis distributor. For service in the USA, contact: TimeLine Vista Inc. 2401 Dogwood Way Vista, CA 92083 3620

8.5 FCC NOTICE

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide a reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. In order to maintain compliance with FCC regulations, shielded cables must be used with this equipment. Operation with nonapproved equipment or unshielded cables is likely to result in interference to radio and TV reception. Any changes or modifications not expressly approved by the manufacturer could void the user's authority to operate the equipment.