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Display time out: You can select the length of time the display stays on. During standby, the phone goes to Sleep mode after a specified period of time, so very little power is being consumed. Choose from Never, 10 seconds, 20 seconds, 30 seconds, 40 seconds, 1 minute, 2 minutes, or 5 minutes. Display brightness: You can adjust the brightness for the display. Choose from Level 1- Level 5. Light sensor: Uses the light levels to adjust the screens brightness and contrast. Choose Off or On. Keypad backlight on: You can select when the keypad backlight is used. Choose from Any time or Custom time. If you selected Custom time, enter the time in the following fields. Start time End time 3. Press the Done soft key when you are finished. Checking the Memory You can check the memory in use for storing files and running programs in your phone or on a microSD memory card.
Storage: Shows the memory used when saving data on the phone. Storage Card: Shows the memory on the Storage Card when the
Storage Card is inserted in the phone. Accessibility You can change the font size and the time out settings in this menu option.
On the Home screen, select Start More More Settings More. More. Accessibility and press the key.
Select the Accessibility settings and press the Done soft key to save your changes.
System font size: choose the font size (Normal or Large) displayed. Confirmation time out: allows you to set the time out period, choose from None, 5 seconds, 10 seconds, or 20 seconds. Changing the Sound Profile Using Profiles, you can adjust and customize the phone tones for different events or environments and then apply the settings as a group. The currently selected profile displays on the Home screen.
On the Home screen, select Start More More Settings More. Memory Info and press the key.
The following memory information is displayed. Memory: Shows the memory used when running programs or applications.
To change profiles: On the Home screen, select Start More More Settings Profiles and press the key. The list of profiles opens.
Understanding Your Phone 21
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Select the profile you want. If you select Automatic, the profile automatically switches between Normal and Vibrate according to your calendar items.
Settings More. More. Owner Information and press the key. Fill in each input field. Press the Done soft key when you are finished.
Error Reporting Setting Your phone has the Error Reporting function which informs you of errors in a program that can give a crash to the phone system. You can enable or disable this function.

On the Home screen, select Start More More Settings More. More. Video Share and press the key. Move the Navigation key Left or Right to adjust settings in each field.
Enter a name for the shortcut key in the Name field. Select a location in the Keypad assignment field by moving the Navigation key Left or Right to select the numeric assignment and press the Done soft key.
To access the shortcut from the Home screen, press and hold the number that you assigned.
Note: Up to 99 locations are available. Locations 0 and 1 are reserved for the international call prefix + and the voicemail center number, respectively.
Service: allows you to turn the Video Share Service On or Off Alerts: allows you to turn On or Off the Video Share Alerts which displays a message and a tone. Auto record: allows you to turn On or Off the Auto Record which records the Video Share call. Recording Location: allows you to set the memory location. Choose from Phone Memory or Storage card if inserted. 2. Press the Done soft key to save the option.
Using an Optional microSD Memory Card
Your phone has an expansion slot compatible with microSDTM memory cards (up to 16 GB), which are primarily used to back up or transfer files and data.
Warning!: Use only compatible memory cards with your phone. Using incompatible memory cards, such as Secure Digital (SD) cards,
Accessing A Menu Using Its Shortcut
On the Home screen, use one of the following ways: For one-digit shortcut keys, press and hold the number key. For two-digit shortcut keys, press the first number key and then press and hold the last number key.
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may damage the card, as well as the phone, and data stored on the card.
Removing the microSD memory card To remove the microSD memory card, push it in and release so that it is disengaged from the slot. Then slide the card out.
Inserting the microSD memory card Push the microSD memory card into the slot, with the arrow pointing toward the handset and with the label side face up until it clicks into place. The card is secure when it is not protruding from the phone.

Correct

Adding and removing programs You can install any program created for your phone, as long as the phone has enough memory. The most popular place to find software for your phone is on the Microsoft web site at http://www.microsoft.com/windowsmobile.

Incorrect

Warning!: The following illustration is the incorrect method for inserting the microSD card. If attempted, damage to the accessory port occurs therefore voiding the phones warranty.
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Adding Programs Using Microsoft ActiveSync You can install programs downloaded from the Internet or included on the Getting Started CD included with your Samsung i637 by performing synchronization between your phone and your computer. First you need to determine what your phone and processor type is so that you know which version of the software to install.

Follow the instructions on the screen for installing Microsoft ActiveSync. When installation completes, the Synchronization Setup Wizard helps you to connect your phone to your desktop computer, to set up a partnership.
Follow the instructions on the screen.
Note: For more information on connecting the phone and a computer, see Connecting with a PC data cable on page 31.
Your first synchronization process will automatically begin when your phone is connected to the computer. After the first synchronization, take a look at Contacts, Calendar, and Tasks on
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your phone. You will notice that your information was copied to the phone.

Click the OK button.

Customizing Connection Settings
To establish a connection between your computer and the phone, you must enable the connections you want to use in the ActiveSync program. By default, all connections are enabled.
Connecting Your Phone to a Computer
To connect the phone to your computer, you can choose one of the following ways: Using a PC data cable Using a Bluetooth connection
From the ActiveSync window on your computer, select File Connection Settings. Change the connection settings.
Connecting with a PC data cable
Connect one end of the PC data cable (included with the i637 handset) to the jack on the right side of the phone and the other end to the USB port on your computer.
Note: USB mode of your phone must be set for Microsoft ActiveSync. Select Start More More Settings Connections USB. Then change the mode to ActiveSync.
Note: If your phone is not connected to the computer, click this button to establish a connection.
If your phone is not connected to the computer, click this button to establish a connection.
The connection is established and the Microsoft ActiveSync window displays. The synchronization automatically begins.
Tip: When an error occurs in a USB connection, activate the DHCP Client service, or deactivate the firewall or VPN environment. USB hubs and laptop docking stations have not exhibited consistent stability with Windows Mobile powered devices and ActiveSync. You can connect the device to the PC USB ports if you experience connection drops or inability to connect through a USB hub or docking station.

Synchronization

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Press the Answer soft key or call and put the first on hold.

to answer the second

To switch back and forth between the two callers, press the Swap soft key. To end the second call and go back to the first, press the key.
Turn Hands-free On/Off: switches the current call to the connected hands-free car kit or headset, or switches it back to the phone. Contacts: opens the contact list. Save to Contacts: saves the phone number of the person with whom you are speaking. Select the <New Item> and enter the applicable information. View Calendar: opens the calendar. Call History: opens the call history list. In Call options during a multi party call: Hold: places one of the current calls on hold. Video Share: allows you to share live or recorded video while on the call. During a multi-party call, this item is inactivated. Mute/Unmute: turns off the microphone so that the person with whom you are speaking cannot hear you, or turns it back on. Turn Speakerphone On/Off: turns on/off the speakerphone mode to talk and listen to the phone a short distance away. Conference/Private: separates the conference call into the two or multiparty calls. Turn Hands-free On/Off: switches the current call to the connected hands-free car kit or headset, or switches it back to the phone. Contacts: opens the contact list. Save to Contacts: saves the phone number of the person with whom you are speaking. Select the <New Item> and enter the applicable information. View Calendar: opens the calendar. Call Functions 39
Using In-call options During a call, you can access various options by pressing the Menu soft key. For a voice call, the following options are available: Hold/Unhold: places the call on hold to place another call or to answer another incoming call. Video Share: allows you to share video, both live and pre-recorded, with another phone that has the video share option.
Note: Before using Video Share, make sure you turn off Wi-Fi if it has been enabled. For more information, refer to Disconnecting Wi-Fi on page 88.
Mute/Unmute: turns off the microphone so that the person with whom you are speaking cannot hear you, or turns it back on. Turn Speakerphone On/Off: turns on/off the speakerphone mode to talk and listen to the phone a short distance away. Conference: joins the two or multiparty call into a conference call.
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Call History: opens the call history list.

To open Call History

Call-related features
Checking your voicemail The first speed dial location is assigned to your voicemail box by default. When you insert your SIM card into the phone, it automatically detects and sets as default the voicemail center number of your mobile service provider. To check your voicemail, press and hold screen. from the Dialing

Call Functions 43

On the Home screen, select Start More More Voice Command and press the key. Select the Voice Enabled field to enable/disable the Voice Command feature. Set it to Yes to enable Voice Command. Select the other fields that you want to enable Voice Command on and move the Navigation key Left or Right to make your selection. Choose from the following: Availability Announcement Routing Announcements Call Confirmations
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Messaging Phone Start Menu Status
Once the call is answered, if you're both capable of Video Share, a Video Share Ready icon displays on the screen Select Menu Video Share.

Video Share

The Video Share features allows you to place a call and share live or recorded video while on the call. You can initiate or receive video by using the following steps.
A pop-up message displays. Select Live or Recorded Video. If you selected Recorded Video, you can view the files in My Stuff My Documents My Videos. Select the file you want to share. If the number is already listed as a contact, the device displays the name corresponding with the number. A message <Name/Number> wants to share video with you. Accept the connection? In case of unknown number, <Number> wants to share video with you. Accept the connection? displays.
To enable or disable Video Share, use the following steps:
From the Home screen select Start More More Settings More. More. Video Share and press the key.
In the Service field enter On or Off.
Press the Yes soft key to continue or the No soft key cancel. When the recipient accepts the video share, Establishing a Video Connection displays to both the sender and the recipient. A Recording Started pop-up displays showing the memory available for the video.
Initiating and Receiving a Video Share Session To initiate and receive a Video Share session use the following steps:
Dial the number and press the
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During a Video Share session, the following display above the soft key options: Stop: press this key to stop the video share feature. Brightness: press this key to adjust the brightness for the video (appears when sending video). Fullscreen: press this key to see the video on a full screen (appears when receiving video). Mute: press this key to turn the audio off. Spkr Off: the Left soft key displays Speaker On or Speaker Off.

From the counter list, press the Menu soft key and select Edit category. Scroll to the category you want. Press the Menu soft key and select Rename. Enter a new name and press the Done soft key. Move the Navigation key Left or Right to change the category icon. Press the Done soft key to save changes.

2. 3. 4. 5.

On the Home screen, select Start More Organizer D-Day and press the key.

Creating a D-Day counter

Press the New soft key. Set options in each field. Time: Enter the date of the day you want to count to or from. Title: Enter the counter title.

Deleting a D-Day counter

Scroll to the counter you want. Press the Menu soft key and select Delete.

Organizer 49

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Search

Your phone provides a search program, Search, to allow you to search for data or media files in your phone with ease and quickly access them.
1. On the Home screen, press the Start More Organizer Search. 2. Enter the first few letters of the item name in the Search field and select an item type in the Category
2. Select the item type you want and set each option.

field.

3. Select Match case and/or Match whole word to let
Choose from the following options to define your search options: Contact Appointment Task Text/Multimedia Message E-mail Phone Call File Name
3. Press the Done soft key when you are finished.
the phone to search for the matching items more quickly.
4. Press the Go soft key. The phone searches its file

Smart Converter

In Smart Converter, you can perform unit conversions.
directory or programs and lists all matching items.
5. Scroll to the one you want and press the Open soft key. Setting Up The Search Options
On the Home screen, select Start More Organizer Smart Converter and press the key. Select a converter type. Select an original unit and enter the value to be converted in the upper unit field. Press to add a decimal point. Your phone only can to change the display up to 6 digits after the decimal point. In the temperature converter, press temperature to below or above zero.
You can change the search options for each item type to provide the phone with more specific information to narrow the search items.

Creating and sending an e-mail message
On the Messaging main screen, select the e-mail account with which you want to send. Press the Menu soft key and select New. In the To, Cc, or Bcc field, enter the recipients e-mail addresses, separating them with a semicolon.
Press the Send soft key when you finish composing the message. Press the Menu soft key and select Send/Receive to connect to the network and send the message.

Viewing E-mail Messages

You can also view messages you received, sent, composed but not sent by accessing the message folders. To open the message folders:
Note: The Cc and Bcc fields are above the To field.
You can retrieve addresses from the contact list by pressing the Menu soft key and selecting Add Recipient.
On the Messaging main screen, access the e-mail account you want, press the Menu soft key, and select Folders. The following default folders display:
Move the Navigation key Down to move to the Subject field and enter the e-mail subject.
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Deleted Items: contains messages that were deleted on your phone. Drafts: stores unsent draft messages. Inbox: contains received messages. Outbox: is a temporary storage place for messages waiting to be sent. Sent Items: stores the messages that were sent. To view an e-mail message:
Mark as Unread/Mark as Read: allows you to mark the message as
unread or read. Unread messages are boldfaced on the message list.
Move: allows you to move the message to other folders. Folders: allows you to access other folders. Tools: allows you to access the following options: Switch Accounts: allows you to switch to another message account. Empty Deleted Items: removes all deleted messages permanently from the phone. Options: allows you to change the options for the Messaging. Select Messages: allows you to select All, All Below, or Several. Send/Receive: sends or receives the e-mail messages. Setting downloading options
On the Messaging main screen, select the e-mail account from which you want to receive e-mail messages. Press the Menu soft key and select Send/Receive. The phone connects to your e-mail server and receives incoming e-mail messages or sends e-mail messages in Outbox.
Select the message you want to view.

On the Home screen, select Start More Applications Mobile Banking and press the key. Follow the onscreen instructions.
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Note: This service is dependent upon your banking institutions rules and regulations. Standard data charges apply.

MobiTV

MobiTV is a subscription service that allows you to watch your favorite TV shows using your handset.
Important!: MobiTV requires a significant amount of data streaming. You must have a data plan and a Bluetooth GPS Receiver to use this feature.
Select the channel you would like to watch. To exit MobiTV, press the Options soft key, and select the Exit option.
On the Home screen, select Start More Applications MobiTV and press the key. Follow the directions on the screen to accept the End User License Agreement and to purchase the feature.

My-Cast Weather

My-Cast is a user-friendly application which runs on your mobile phone giving you access to all the weather information you need. You can check current and predicted National Weather Service data for your immediate location, your travel destination, or virtually anywhere else in the continental U.S. The application is a separately licensed product that requires you to download the feature to your handset, and accept the license agreement before using. A trial period is provided for you to test it for your own use.
Note: Before purchasing MobiTV, make sure you turn off Wi-Fi if it has been enabled. For more information, refer to Disconnecting Wi-Fi on page 88.
The MobiTV initialization screen displays, showing the progress of the application. Once the initialization is complete, the on-screen TV guide for the channels available displays.
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Note: Before using My-Cast Weather, make sure you turn off Wi-Fi if it has been enabled. For more information, refer to Disconnecting Wi-Fi on page 88.
On the Home screen, select Start More Applications More Photo Slides and press the thumbnails of the photos. key. All of your folders that contain photos will be displayed with

To Start My-Cast Weather

On the Home screen, select Start More Applications More My-Cast Weather and press the key. The MyCast Weather screen will appear followed by an option screen.
Highlight a folder and press the Slide show soft key to see a slide show of all of your photos in that folder. Press the key to display a tool bar that allows you to pause, stop, rewind, fast forward, rotate photos, or play music.
To access folder options, highlight a folder and press the Menu soft key. The following options are displayed:

Note: If you are not sure about the information to enter, ask your network administrator.
Enter the requested information: Description: Enter a name for the connection. Connects from: Select the type of network from which you will connect. Connects to: Select the type of network to which you will connect. Proxy (name:port): Enter the proxy server name and port number in the form. Type: Select a network type for which the proxy connection is used. User name: Enter your user name for the network to which you will connect. Password: Enter your password.
Press the Done soft key when you are finished.
Note: If you are not sure about the information to enter, ask your service provider.
Creating a proxy connection You can use a proxy connection to gain access to the Internet over an existing connection to your corporate network.
Creating a VPN connection
If your company has set up a virtual private network (VPN), you can create a VPN connection to gain access to your corporate network over an Internet connection.
On the Home screen, select Start More More Settings Connections Proxy and press the key. Highlight New in the Proxy menu list. -Or-
On the Home screen, select Start More More Settings Connections More. VPN and press the key.
Press the Menu soft key and select Add.
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Highlight New in the menu list. -OrPress the Menu soft key and select Add.
Setting up data connections After creating connection profiles, you can assign a profile to each network type.
On the Connections screen, press the Menu soft key and select Advanced. Select a connection profile in each network. Press the Done soft key when you are finished.
Enter the requested information: Description: Enter a name for the connection. VPN type: Select the type of VPN. Server: Enter the VPN server name. Connects from: Select the type of network from which you will connect to VPN (typically The Internet). Connects to: Select the type of network to which you will connect (typically Work). User name: Enter your user name for the VPN. Password: Enter your password. Domain: Enter the domain name, if required. IPSec authentication: If you selected IPSec/L2TP for VPN type, select the type of authentication. IPSec Pre-shared key: If you selected Pre-Shared Key for IPSec authentication, enter the shared key.
Adding a URL exception Some URL addresses for web pages on your company intranet may use periods, for example: intranet.companyname.com. To view these pages in Internet Explorer, you must create a URL exception.
Note: You do not need to create URL exceptions for Internet URL addresses.

1. 2. 3. 4.

On the Connections screen, press Menu Advanced. Press the Menu soft key and select Work URL Exceptions. Press the Menu soft key and select Add. Enter the URL Pattern and press the Done soft key. Separate multiple URL patterns with a semicolon.

Wi-Fi allows you to:

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3. 4. 5.

Highlight the network name and press the Press the Next soft key. Press the Finish soft key.
Enter a name in the Network name: field and press the Down Navigation key to highlight the next field. Highlight the Network type: field and select Internet if the network connects to the Internet (does not use proxy settings) or Private/Work Network (uses proxy settings).
You are then connected to the network. The Wi-Fi connected icon ( main display. ) displays on the Title Bar of the Home
screen. Wi-Fi: [Wi-Fi Network Name] will appear on your
If the network is hidden (that is, does not broadcast its SSID), highlight the This is a hidden network field and press the key to make a checkmark.
Manually Entering Network Settings
A wireless network can be added when a network is detected (the Wi-Fi icon displays in the Title Bar), or you can add the network manually by entering setting information.
Select the Next soft key to continue onto the Authentication and Data Encryption information. Use the information provided by your Network administrator to complete this section.
10. Highlight The key is automatically provided field and press

the key. key.

key to make a checkmark if the key is provided.
Otherwise, highlight the Network key: field and enter the
Press the Menu soft key. Highlight Wi-Fi Settings and press the The Wi-Fi screen displays.
11. Highlight the Key index: field and use the Left or Right
Navigation keys to select the key index. key.
12. Press the Finish soft key.
Highlight New. and press the

Getting Connected

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The Wi-Fi Always On screen displays. Press the key to remove the checkmark from the
Wi-Fi always on checkbox.
Setting Wi-Fi to Always On
To set Wi-Fi to always be on, follow these steps:
Changing Connection Information
To change the connection information for the Wi-Fi network you are connected to, follow these steps:
On the Home screen, select Start More More Settings Connections More. Wi-Fi Always On and press the key. The Wi-Fi Always On screen displays.
key to make a checkmark in the Wi-Fi
Press the Menu soft key. Highlight Wi-Fi Settings and press the The Wi-Fi screen displays. key.

always on checkbox.

Note: Power consumption will be increased when using this option.

absorption of RF energy in the head because the phone, which is the source of the RF emissions, will not be placed against the head. On the other hand, if the phone is mounted against the waist or other part of the body during use, then that part of the body will absorb more RF energy. Wireless phones marketed in the U.S. are required to meet safety requirements regardless of whether they are used against the head or against the body. Either configuration should result in compliance with the safety limit. Do wireless phone accessories that claim to shield the head from RF radiation work? Since there are no known risks from exposure to RF emissions from wireless phones, there is no reason to believe that accessories that claim to shield the head from those emissions reduce risks. Some products that claim to shield the user from RF absorption use special phone cases, while others involve nothing more than a metallic accessory attached to the phone. Studies have shown that these products generally do not work as advertised. Unlike "hand-free" kits, these so-called "shields" may interfere with proper operation of the phone. The phone may be forced to boost its power to compensate, leading to an increase in RF absorption. In February 2002, the Federal trade Commission (FTC) charged two companies that sold devices that claimed to protect wireless phone users from radiation with making false and unsubstantiated claims.
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According to FTC, these defendants lacked a reasonable basis to substantiate their claim. What about wireless phone interference with medical equipment? Radio frequency energy (RF) from wireless phones can interact with some electronic devices. For this reason, FDA helped develop a detailed test method to measure electromagnetic interference (EMI) of implanted cardiac pacemakers and defibrillators from wireless telephones. This test method is now part of a standard sponsored by the Association for the Advancement of Medical instrumentation (AAMI). The final draft, a joint effort by FDA, medical device manufacturers, and many other groups, was completed in late 2000. This standard will allow manufacturers to ensure that cardiac pacemakers and defibrillators are safe from wireless phone EMI. FDA has tested wireless phones and helped develop a voluntary standard sponsored by the Institute of Electrical and Electronic Engineers (IEEE). This standard specifies test methods and performance requirements for hearing aids and wireless phones so that no interference occurs when a person uses a compatible phone and a compatible hearing aid at the same time. This standard was approved by the IEEE in 2000. FDA continues to monitor the use of wireless phones for possible interactions with other medical devices. Should harmful

Health and Safety Information 133
Provided by the Cellular Telecommunications & Internet Association.
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Set the volume in a quiet environment and select the lowest volume at
which you can hear adequately.
When using headphones, turn the volume down if you cannot hear the
American Academy of Audiology 11730 Plaza American Drive, Suite 300 Reston, VA 20190 Voice: (800) 222-2336 Email: info@audiology.org Internet: http://www.audiology.org National Institute on Deafness and Other Communication Disorders National Institutes of Health 31 Center Drive, MSC 2320 Bethesda, MD 20892-2320 Email: nidcdinfo@nih.gov Internet: http://www.nidcd.nih.gov/
people speaking near you or if the person sitting next to you can hear what you are listening to. Do not turn the volume up to block out noisy surroundings. If you choose to listen to your portable device in a noisy environment, use noise-cancelling headphones to block out background environmental noise. By blocking background environment noise, noise cancelling headphones should allow you to hear the music at lower volumes than when using earbuds. Limit the amount of time you listen. As the volume increases, less time is required before you hearing could be affected. Avoid using headphones after exposure to extremely loud noises, such as rock concerts, that might cause temporary hearing loss. Temporary hearing loss might cause unsafe volumes to sound normal. Do not listen at any volume that causes you discomfort. If you experience ringing in your ears, hear muffled speech or experience any temporary hearing difficulty after listening to your portable audio device, discontinue use and consult your doctor. You can obtain additional information on this subject from the following sources:
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National Institute for Occupational Safety and Health (NIOSH) 395 E Street, S.W. Suite 9200 Patriots Plaza Building Washington, DC 20201 Voice: 1-800-35-NIOSH (1-800-356-4647) 1-800-CDC-INFO (1-800-232-4636) Outside the U.S. 513-533-8328 Email: cdcinfo@cdc.gov Internet: http://www.cdc.gov 1-888-232-6348 TTY Internet: http://www.cdc.gov/niosh/topics/noise/ default.html

FCC Hearing-Aid Compatibility (HAC) Regulations for Wireless Devices
On July 10, 2003, the U.S. Federal Communications Commission (FCC) Report and Order in WT Docket 01-309 modified the exception of wireless phones under the Hearing Aid Compatibility Act of 1988 (HAC Act) to require digital wireless phones be compatible with hearing-aids. The intent of the HAC Act is to ensure reasonable access to telecommunications services for persons with hearing disabilities. While some wireless phones are used near some hearing devices (hearing aids and cochlear implants), users may detect a buzzing, humming, or whining noise. Some hearing devices are
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relatively immune to interference noise. The hearing aid and wireless phone rating values are then added together. A sum of 5 is considered acceptable for normal use. A sum of 6 is considered for best use.
The HAC rating and measurement procedure are described in the American National Standards Institute (ANSI) C63.19 standard.

HAC/Wi-Fi Language

This phone has been tested and rated for use with hearing aids for some of the wireless technologies that it uses. However, there may be some newer wireless technologies used in this phone that have not been tested yet for use with hearing aids. It is important to try the different features of this phone thoroughly and in different locations, using your hearing aid or cochlear implant, to determine if you hear any interfering noise. Consult your service provider about its return and exchange policies and for information on hearing aid compatibility. Other Medical Devices If you use any other personal medical devices, consult the manufacturer of your device to determine if it is adequately shielded from external RF energy. Your physician may be able to assist you in obtaining this information. Switch your phone off in health care facilities when any regulations posted in these areas instruct you to do so. Hospitals or health care facilities may be using equipment that could be sensitive to external RF energy. Vehicles RF signals may affect improperly installed or inadequately shielded electronic systems in motor vehicles. Check with the
Health and Safety Information 137
In the above example, if a hearing aid meets the M2 level rating and the wireless phone meets the M3 level rating, the sum of the two values equal M5. This is synonymous for T ratings. This should provide the hearing aid user with "normal usage" while using their hearing aid with the particular wireless phone. "Normal usage" in this context is defined as a signal quality that is acceptable for normal operation. The M mark is intended to be synonymous with the U mark. The T mark is intended to be synonymous with the UT mark. The M and T marks are recommended by the Alliance for Telecommunications Industries Solutions (ATIS). The U and UT marks are referenced in Section 20.19 of the FCC Rules.