PS 260T DUAL CHANNEL AUDIO INTERFACE

USER MANUAL

Issue 2010 ASL Intercom BV
DESIGNED AND MANUFACTURED BY: ASL INTERCOM B.V. ZONNEBAAN EG UTRECHT THE NETHERLANDS PHONE: +31 (0)FAX: + 31 (0)E-MAIL: info@asl-inter.com WEB: www.asl-inter.com
CONTENT OF THIS USER MANUAL
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 GENERAL DESCRIPTION.. 3 UNPACKING.. 3 WARRANTY.. 3 MECHANICAL INSTALLATION. 3 FRONT PANEL CONTROLS. 4 REAR PANEL CONNECTORS.. 4 SUM OUTPUTS.. 5 TECHNICAL SPECIFICATIONS. 5 PARTY LINE, TECHNICAL CONCEPT. 6 CABLING.. 6 EARTHING CONCEPT.. 7 BLOCK DIAGRAM PS 260T. 8 POSSIBLE SYSTEM CONFIGURATION. 9
PAGE 2 User Manual PS 260T / Issue 2010 ASL Intercom BV.

GENERAL DESCRIPTION

The PS 260T is designed to interface the party lines of the ASL intercom system to external audio equipment or 4-wire communication systems. Applications may be: Temporarily extending a fixed installed 4-wire intercom system with a portable ASL intercom set for use on location, connecting an ASL intercom system to a (4-wire) camera CCU, injecting an external audio signal into an ASL intercom party line, monitoring the audio of an ASL intercom party line by external equipment such as recorders or paging systems, etc. The PS 260T includes two separate and identical interface modules. Each interface has its Intercom Line connectors and its Audio Line connectors (input and output), positioned on the rear of the PS 260T.
The electronic circuitry of each interface is powered by the 30V DC power supplied via the intercom party line. The unbalanced signal on the audio wire of the ASL party line appears on the PS 260T audio output connector after being converted to a balanced signal. The signals brought to the audio input connector are placed on the audio wire of the intercom line connector. Two-stage side tone trimmers avoid that audio input signals appear at the audio output connector. The input/output separation is better than 30 dB from 200 Hz to 20 kHz. The built-in test tone generator assists to adjust or check the side tone levels. The audio inputs and audio outputs of the PS 260T are transformer balanced.
UNPACKING After unpacking the unit please inspect for any physical damage to the unit, and retain the shipping carton and relevant packing materials for use should the unit need returning. If any damage has occurred, please notify your dealer so that a written claim can be initiated. Please also refer to the warranty section of this manual.
The shipping carton contains the parts listed below * The PS 260T * User manual If any are missing, contact your dealer. ASL has taken great care to ensure this product reaches you in flawless condition.
WARRANTY Faults arising from misuse, unauthorized modifications or accidents are not covered by this warranty. If the unit is faulty, it should be sent in its original packing to the supplier or your local ASL dealer, with shipping prepaid. A note must be included stating the faults found and a copy of the original suppliers invoice.
This unit is warranted by ASL Intercom to the original end-user purchaser against defects in workmanship and materials in its manufacture for a period of one year from the date of shipment to the end-user.

MECHANICAL INSTALLATION There are no separate power connections to install since the necessary DC voltages are derived from the ASL party line. The PS 260T is fully protected against wiring mistakes (reverse power) or short circuit in the interconnecting cables.
To connect the PS 260T to an ASL party line intercom system and to external audio equipment or a 4-wire intercom system, use professional flexible microphone cable with 2 wires and 1 shield only. The party line cables are to be connected to the INTERCOM LINE connectors on the rear of the PS 260T. The cables from/to external audio equipment or of a 4-wire intercom system are to be connected to the AUDIO LINE connectors (input & output), also on the rear of the PS 260T.
PAGE 3 User Manual PS 260T / Issue 2010 ASL Intercom BV.

FRONT PANEL CONTROLS

The PS 260T contains two identical interface modules. Each interface has the following front panel controls: 1 POWER LED indicator This LED illuminates if line power is supplied by an ASL separate power supply or an ASL master station, via the intercom party line 2 INPUT LEVEL control knob This knob controls the level of the audio input signal before it is placed on the intercom line 3 OUTPUT LEVEL control knob This knob controls the level of the intercom audio signal appearing at the output connector 4 SIDE TONE LEVEL trimmer This trimmer controls the input/output separation 5 SIDE TONE HI trimmer This trimmer controls the input/output separation in the high frequency range 6 SIDE TONE TEST knob This hidden push button activates a test tone generator which adds a 200 Hz tone to the audio input circuitry. This to assist adjusting or checking the side tone trimmer settings. The momentary push button can be reached with a pin or pen. Side tone adjustment procedure: Connect a monitor amplifier + speaker to the audio output Turn up output level of the PS 260T to approx. 50% Bring the side tone trimmers in start position: Level trimmer: turn fully clockwise Hi trimmer: turn fully anti clockwise Activate the test tone generator. Minimize test tone level by turning the level trimmer anti clock wise. Minimize the remaining high frequencies of the test tone by turning the hi trimmer clockwise. Repeat the two last mentioned procedures to obtain the lowest possible test tone levels. The test tone is also heard by the users of the party line intercom, which is rather disturbing. ASL advises to not activate the test tone when the party line intercom system is in use.

REAR PANEL CONNECTORS

The PS 260T contains two identical interface modules. Each interface has the following rear panel connectors: 7 AUDIO INPUT connector (XLR-3) The input is transformer balanced. Pin assignments : Pin 1: 0V / ground shield Pin 2: signal + Pin 3: signal 8 AUDIO OUTPUT connector (XLR-3) The output is transformer balanced and capable of driving a 600 ohms load. For pin assignments see #7: 9 INTERCOM IN connector (XLR-3) This connector is for connecting the intercom party line. Pin assignments : Pin 1: 0V / ground shield Pin 2: +30V power wire Pin 3: audio wire INTERCOM LINK connector (XLR-3) This connector is for extending the intercom party line to other user stations or interface units. For pin assignments, see #9.
PAGE 4 User Manual PS 260T / Issue 2010 ASL Intercom BV.

SUM OUTPUTS

Each intercom line can be monitored via the audio output of each interface module. This the factory setting. If required, one interface module can monitor both intercom lines: the intercom audio signals of both intercom lines appear on the audio output connector of that interface module. To achieve this, certain internal connections have to be made. Procedure: a. Unscrew the upper cover plate and slide it backwards b. Place the unit in front of you, facing the front panel c. Depending on which output connection is required, follow one of the procedures described below d. Screw the cover plate back in place
Connection scheme A Function: Output of interface 1 monitors intercom lines 1 + 2 Actions: Connect the right tag of interface 2 with the middle tag of interface 1. Connect the left tag of interface 2 to the left tag of interface 1.
Connection scheme B Function: Output of interface 2 monitors intercom lines 1 + 2. Actions: Connect the right tag of interface 1 with the middle tag of interface 2. Connect the left tag of interface 1 to the left tag of interface 2.
TECHNICAL SPECIFICATIONS Dimensions & Weight width 19" (483mm) height 1U (1,75 / 44.5mm) depth 126 mm weight 1565 grams Party Line Specifications supply voltage: +30V DC (12V to 32V DC) supply current: 33 mA quiescent / each audio line level: -18 dBu to 0 dBu signal-to-noise: 80dB station bridging impedance: > 150 kOhm
Intercom Line Driver Max. output current: 3 mA rms output impedance: > 150 Kohm Input Amplifier input impedance: 600 ohm (transformer balanced) input level: +30 dBu to -10 dBu frequency response: 150 Hz 20 kHz (-3 dB) Output Amplifier output impedance : 600 ohm (transformer balanced) maximum load: 600 ohms max. output level: +20 dBu to -20 dBu frequency response: 150 Hz - 20 kHz (-3 dB) Side Tone Trimming Rejection: better than 30 dB
0 dBu is defined as 775 mV into open circuit ASL reserves the right to alter specifications without prior notice

PAGE 5 User Manual PS 260T / Issue 2010 ASL Intercom BV.
PARTY LINE, TECHNICAL CONCEPT This principle has three advantages: the use of a single audio line allows several stations to talk and listen simultaneously due to the high bridging impedance offered by each station, the number of stations on the party line has no influence on the level of the communications signal power and audio to the intercom stations use the same cable The Call signal is also sent as a current on the audio line. It develops a DC potential over the line impedance which will be sensed by each station and interpreted as a Call signal.
User stations in an ASL intercom system are connected via one or several 'party lines'. A party line offers two way (full duplex) communication and consists of standard microphone (multi-pair) cable. One wire is used as an audio line, one as a power line and the screen of the cable functions as earth/return. Current drive is used for signal transfer. Each station utilizes a current amplifier to amplify the microphone signal and place it on the common audio line where, due to the constant line impedance (situated in the power supply between XLR pin 3 and 1), a signal voltage is developed which can be further amplified and sent to the headphones or loudspeakers. 10.0 CABLING
The intercom lines (the party lines) are of the shielded two-conductor microphone cable type. The intercom line connectors are of the XLR-3 type. Audio and Call signals are on XLR pin 3, DC power is on XLR pin 2. XLR pin 1 is connected to the shield of the cable which functions as the common return for audio and power. The audio signal is transferred in an unbalanced way (see Party Line, Technical Concept). To avoid earth loops (hum), the possible effect of electromagnetic fields and to minimize power loss, certain rules have to be obeyed when installing the cabling of an intercom system : Use high quality cable Use high quality microphone cable (shielded two conductor cable, minimum 2x 0.30 mm2). In case multi-pair microphone cable is used, it should be of high quality and each pair should consist of two conductors (minimum 2x 0.15 mm2) with separate shield and an overall shield. Use flexible cable Use flexible single and multi-pair microphone cable instead of cable with solid cores, especially when the cable is subjected to bending during operation or installation. Cable screens to XLR pin 1 The screen of each separate microphone cable and/or the screen of each single pair in a multi-pair cable, should be connected to pin 1 of each XLR-3 connector. Do not connect these screens to the metal housing of ASL unitst or XLR-3 wall boxes. See section Earthing Concept. Connect metal cable trunks, wall boxes and overall multi-pair cable screens to clean earth Metal cable trunks, metal wall boxes and overall multi-pair cable screens should be interconnected and, at the 'central earth point' in the intercom network only, be connected to a clean earth or a safety earth. (see section Earthing Concept). Keep metal connection boxes and cable trunks or pipes isolated from other metal parts Metal trunks or pipes for intercom cables and metal connection boxes should be mounted in such a way that they are isolated from any other metal housing or construction part. Keep cables parallel as much as possible When two (multi channel) units in a network are connected by more than one cable, make sure that these cables are parallel to each other over the whole distance between those units. When using multi-pair cable, parallelism is ensured in the best possible way. Avoid closed loops Always avoid that intercom cables are making a closed loop. So-called 'ring intercom' should not physically be cabled as a ring. Keep cables away from electromagnetic sources Keep intercom cables away from high energy cables, e.g. 115/230/400V mains power or dimmer controlled feeds for spotlights. Intercom cables should cross high energy cables at an angle of 90 only. Intercom cables should never be in the same trunks as energy cables. Place power supply in a central position In case of a system powered by a separate power supply: In order to diminish power losses, place the power supply as close as possible to where most power consumption occurs, in other words most user stations are placed. ASL powered units to a 'clean' mains outlet Master stations or power supplies should be connected to a mains outlet with a clean earth. Other audio equipment may be connected to this mains outlet, but avoid using an outlet which also powers dimmer controlled lighting systems. In case of more complex installations, don't hesitate to contact us for advice.

BS 286 DUAL CHANNEL POWER SUPPLY

USER MANUAL

February 2011 ASL Intercom BV
DESIGNED & MANUFACTURED BY: ASL Intercom B.V. Zonnebaan EG Utrecht The Netherlands Tel: +31 (0)Fax: +31 (0)Email: info@asl-inter.com Web: www.asl-inter.com
CONTENT OF THIS USER MANUAL
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0
SAFETY INSTRUCTIONS... 3 UNPACKING.... 4 WARRANTY.... 4 MECHANICAL INSTALLATION... 4 MAINS POWER & SAFETY EARTH... 4 GENERAL DESCRIPTION... 4 FRONT PANEL CONTROLS & CONNECTOR.. 5 REAR PANEL CONTROLS & CONNECTORS.. 5 TECHNICAL SPECIFICATIONS... 5 PARTY LINE, TECHNICAL CONCEPT.. 6 CABLING.... 6 EARTHING CONCEPT... 7 BS 286 BLOCK DIAGRAM.. 8 POSSIBLE SYSTEM CONFIGURATION... 9
PAGE 2 User Manual BS 286 / February 2011 ASL Intercom BV

SAFETY INSTRUCTIONS

Please always follow these instructions to help ensure against injury to yourself and/or damage to the system
1. Read all safety and operating instructions before you operate the apparatus. 2. Retain all safety and operating instructions for future reference. 3. Heed all warnings on the apparatus and in the safety and operating instructions and follow all installation and use instructions. 4. Follow all installation, operating and use instructions. 5. Unplug the apparatus from the AC power outlet before cleaning. Use only a damp cloth for cleaning the exterior of the apparatus. 6. Do not use accessories or attachments not recommended by the manufacturer, as they may cause hazards and void the warranty. 7. Do not operate this apparatus in high humidity areas or expose it to water or moisture. 8. Do not place the apparatus on an unstable cart, stand, tripod, bracket or table. The apparatus may fall, causing serious personal injury and damage to the apparatus. 9. Do not block or cover any openings in the apparatus. These are provided for ventilation and protection from overheating. Never place the apparatus near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. Do not place the apparatus in an enclosure such as a cabinet without proper ventilation. 10. Operate the apparatus using only the type of power source indicated on the marking label. Unplug the apparatus power cord by gripping the power plug, not the cord.
11. Insert the plug properly. Do not defeat the safety purpose of the polarized or grounding-type plug. An American polarized AC line plug has two blades with one wider than the other. This plug will fit only one way into the power outlet. This is a safety feature. If you are unable to insert the plug fully into the outlet, try reversing the plug. If the plug still fails to fit, contact an electrician to replace the obsolete outlet. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician to replace the obsolete outlet. 12. Route power supply cords so that they are not likely to be walked on or pinched by items placed upon or against them. Pay particular attention to cords at plugs, convenience receptacles, and the point where they exit from the apparatus. 13. Do not overload wall outlets or extension cords, as this can result in a risk of fire or electrical shock. 14. Unplug this apparatus during lightning storms or when unused for long periods of time. 15. Never insert objects of any kind into the apparatus through openings, as the objects may touch Dangerous voltage points or short out parts. This could cause fire or electrical shock. 16. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as when the power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
PAGE 3 User Manual BS 286 / February 2011 ASL Intercom BV
UNPACKING ASL has taken great care to ensure that this product reaches you in flawless condition. After unpacking the unit please inspect for any physical damage to the unit, and retain the shipping carton and relevant packing materials for use should the unit need returning. If any damage has occurred, please notify your dealer immediately so that a written claim can be initiated. Please also refer to the warranty section of this manual.
The shipping carton contains the parts listed below * The BS 286 * Mains power cable * Spare fuses * User manual If any are missing, contact your dealer.
WARRANTY or accidents are not covered by this warranty. If the unit is faulty it should be sent in its original packing, to the supplier or your local ASL dealer, with shipping prepaid. A note must be included stating the faults found and a copy of the original suppliers invoice.

This unit is warranted by ASL Intercom to the original end-user purchaser against defects in workmanship and materials in it's manufacture for a period of one year from date of shipment to the end-user. Faults arising from misuse, unauthorized modifications 4.0 MECHANICAL INSTALLATION
For the BS 286 a vertical rack space of 1U (1.75, 44mm) is required. It is not necessary to provide rear support by extra bracing or shelving. Adequate ventilation must be provided by allowing sufficient space around the sides and rear of the unit to ensure free circulation of air. 5.0 MAINS POWER & SAFETY EARTH
Forced cooling is not required. The power supply regulator is mounted on the rear of the unit; after a period of time it will feel hot to the touch. This is quite normal, and should be no cause for alarm.
Connecting to mains power The BS 286 may be connected to a mains power outlet which provides V AC, 50-60 Hz and at least 60 watts. The outlet should have a clean earth. Avoid using mains power outlets which also power dimmer controlled lighting equipment. The wires in the mains lead are color coded: green/yellow: Earth / safety ground blue: Neutral brown: Live In case the wires in the mains lead do not correspond with the colored markings identifying the terminals in your mains plug, proceed as follows: The wire which is colored green/yellow must be connected to the terminal in the plug which is marked with the letter E, or by the ground symbol, or is colored green. 6.0 GENERAL DESCRIPTION Should one of these conditions occur, the unit shuts down. Once the fault condition has been removed, the BS 286 resets automatically and full power is restored. An Aux input at the rear panel allows injecting external audio signals of line or mic level into the intercom lines. When mic level is selected, +30V phantom power is available at the Aux input connector. The wire which is colored blue must be connected to the terminal which is marked with the letter N or colored black. The wire which is colored brown must be connected to the terminal which is marked with the letter L or colored red. Safety Earth The green/yellow wire of the mains lead must always be connected to the electrical installation safety earth or ground. This is essential for personal safety as well as for proper operation of the BS 286 and the other connected stations. The green/yellow wire is in the BS 216 connected to all exposed metal surfaces. Any rack framework into which this unit might be mounted is assumed to be connected to the same grounding circuit.

The BS 286 is a dual channel power supply and can be used in an ASL intercom system. The unit is ideal for use in applications where standard microphone cable is available and ease of setup is of paramount importance. The unit can drive at least 10 beltpacks operating at full power. The dual channel power supply is fully protected against wiring mistakes (reverse power), short circuit or dangerous thermal condition.
PAGE 4 User Manual BS 286 / February 2011 ASL Intercom BV
FRONT PANEL CONTROLS & CONNECTOR
POWER ON/OFF switch Mains power push button for switching ON and OFF the internal power supply.
MAINS POWER LED This LED illuminates if the unit is switched on. AUX VOLUME control knobs These knobs adjust the level of the AUX input to each of the two intercom lines.
REAR PANEL CONTROLS & CONNECTORS
A & B LINE connectors These XLR-3 type connectors are for connecting remote stations, using standard microphone cable. There are 2 connectors for channel A and 2 connectors for channel B. Pin assignments: Pin 1: 0V / ground shield Pin 2: +30V DC power wire Pin 3: audio wire AUX INPUT connector This XLR-3 input is electronically balanced and accepts audio levels between 18 dBu to +22 dBu on line level, and 38 dBu to +2 dBu on mic level. Pin assignments : Pin 1. 0V / ground Pin 2: signal + Pin 3: signal TECHNICAL SPECIFICATIONS
Next to the AUX input is an INPUT LEVEL switch for selecting either line level or mic level. When mic level is selected, +30V DC phantom power is supplied to pin 2 and 3 of the AUX input connector. With the MIC GAIN trimmer one can adjust the input sensitivity when mic level is selected. 6 FUSE Holder The fuse protects the BS 286 against severe internal damage, in case of malfunction in the power section. Before replacing a fuse the mains cord must be disconnected from the mains outlet. MAINS Inlet IEC Mains connector
System Dynamic range: 80 dB (1kHz, THD <1%) Call signal (send): +2.8 mA Call signal threshold (receive): +2.4 V DC Supply voltage: +30 V DC (12 V to 32 V) Intercom line Impedance: 350 (1 kHz), 2.2 k (DC) Audio level: nom. -18 dBu, max. +4 dBu Switch Mode Power Supply Mains voltage: 100 - 240 V AC, 50/60 Hz Output voltage: +30 V DC (+/- 5%) Max output power: 45 W Max power consumption BS 286: 60 watts
Aux Input Input Impedance: 30 kOhms (line level) 4.6 kOhms (mic level) Nominal Input Level: -18 to +6 dBu (line level) -38 to -14 dBu (mic level) Max. Input Level: +22 dBu (line level) +2 dBu (mic level) Phantom Power: +30 V DC (when mic level is selected) 0 dBu defined as 775 mV rms into open circuit.
ASL reserves the right to change specifications without prior notice

PAGE 5 User Manual BS 286 / February 2011 ASL Intercom BV
PARTY LINE, TECHNICAL CONCEPT This principle has three advantages: the use of a single audio line allows several stations to talk and listen simultaneously due to the high bridging impedance offered by each station, the number of stations on the party line has no influence on the level of the communications signal power and audio to the intercom stations use the same cable The Call signal is also sent as a current on the audio line. It develops a DC potential over the line impedance which will be sensed by each station and interpreted as a Call signal.
User stations in an ASL intercom system are connected via one or several 'party lines'. A party line offers two way (full duplex) communication and consists of standard microphone (multi-pair) cable. One wire is used as an audio line, one as a power line and the screen of the cable functions as earth/return. Current drive is used for signal transfer. Each station utilizes a current amplifier to amplify the microphone signal and place it on the common audio line where, due to the constant line impedance (situated in the power supply between XLR pin 3 and 1), a signal voltage is developed which can be further amplified and sent to the headphones or loudspeakers. 11.0 CABLING
The intercom lines (the party lines) are of the shielded two-conductor microphone cable type. The intercom line connectors are of the XLR-3 type. Audio and Call signals are on XLR pin 3, DC power is on XLR pin 2. XLR pin 1 is connected to the shield of the cable which functions as the common return for audio and power. The audio signal is transferred in an unbalanced way (see Party Line, Technical Concept). To avoid earth loops (hum), the possible effect of electromagnetic fields and to minimize power loss, certain rules have to be obeyed when installing the cabling of an intercom system : Use high quality cable Use high quality microphone cable (shielded two conductor cable, minimum 2x 0.30 mm2). In case multi-pair microphone cable is used, it should be of high quality and each pair should consist of two conductors (minimum 2x 0.15 mm2) with separate shield and an overall shield. Use flexible cable Use flexible single and multi-pair microphone cable instead of cable with solid cores, especially when the cable is subjected to bending during operation or installation. Cable screens to XLR pin 1 The screen of each separate microphone cable and/or the screen of each single pair in a multi-pair cable, should be connected to pin 1 of each XLR-3 connector. Do not connect these screens to the metal housing of ASL unitst or XLR-3 wall boxes. See section Earthing Concept. Connect metal cable trunks, wall boxes and overall multi-pair cable screens to clean earth Metal cable trunks, metal wall boxes and overall multi-pair cable screens should be interconnected and, at the 'central earth point' in the intercom network only, be connected to a clean earth or a safety earth. (see section Earthing Concept). Keep metal connection boxes and cable trunks or pipes isolated from other metal parts Metal trunks or pipes for intercom cables and metal connection boxes should be mounted in such a way that they are isolated from any other metal housing or construction part.

Keep cables parallel as much as possible When two (multi channel) units in a network are connected by more than one cable, make sure that these cables are parallel to each other over the whole distance between those units. When using multi-pair cable, parallelism is ensured in the best possible way. Avoid closed loops Always avoid that intercom cables are making a closed loop. So-called 'ring intercom' should not physically be cabled as a ring. Keep cables away from electromagnetic sources Keep intercom cables away from high energy cables, e.g. 115/230/400V mains power or dimmer controlled feeds for spotlights. Intercom cables should cross high energy cables at an angle of 90 only. Intercom cables should never be in the same trunks as energy cables. Place power supply in a central position In case of a system powered by a separate power supply: In order to diminish power losses, place the power supply as close as possible to where most power consumption occurs, in other words most user stations are placed. ASL powered units to a 'clean' mains outlet Master stations or power supplies should be connected to a mains outlet with a clean earth. Other audio equipment may be connected to this mains outlet, but avoid using an outlet which also powers dimmer controlled lighting systems.
In case of more complex installations, don't hesitate to contact us. Please send us a block diagram of the planned network with a list of all user stations and their positions, and we are happy to advise you on cabling lay out.
PAGE 6 User Manual BS 286 / February 2011 ASL Intercom BV

EARTHING CONCEPT

PAGE 7 User Manual BS 286 / February 2011 ASL Intercom BV

BS 286 BLOCK DIAGRAM

PAGE 8 User Manual BS 286 / February 2011 ASL Intercom BV
POSSIBLE SYSTEM CONFIGURATION
PAGE 9 User Manual BS 286 / February 2011 ASL Intercom BV