AT&T MERLIN LEGEND Release 3.1 System Planning Manual page 227

Assigning Lines/Trunks to Data and Video Stations
When you choose the mode of operation (Key, Behind Switch, or Hybrid/PBX),
Intercom (ICOM) or System Access (SA) buttons are assigned automatically to
every extension connected to the control unit. However, you can customize the
system by changing the factory-set assignments and reassigning line buttons.
The number and types of buttons assigned depends on the mode chosen and
the type of extension jack you are using.
For detailed information and telephone programming requirements for
lines/trunks, see the Equipment and Operations Reference .
NOTE:
Trunks cannot be independently assigned to analog voice and modem data
stations. The line/trunk assignment for the telephone also includes the modem
extension; therefore, these instructions are not used for these types of data
stations.
Forms Needed
Data Form 1a, Modem Data Stations
Data Form 1b, Data Stations
Form 4e, MFM Adjunct: MLX Telephone
Form 5c, MFM Adjunct: DLC
Planning Form Instructions
You should have already filled out preliminary information on Forms 4e and 5c
when you planned voice communications. The lines/trunks for MLX telephones
have already been assigned.
There are two different forms for data stations:
Data Form 1a. Use this form for modem data-only stations and for
modems used to communicate with the local host computer and to
communicate with a workstation on a LAN.
Data Form 1b. Use this form for ISDN terminal adapters and ISDN
terminal adapter data stations used to communicate with the local host
computer and to communicate with a workstation on a LAN.
Data Communications
5–29