AT&T 75 Wiring Manual page 410

110-TYPE HARDWARE
PDM, Trunk Data Module, or 212-Type Modem Switch Settings
PDM or Trunk Data Module
The following switch settings are recommended:
212-Type Modem
The following switch settings are recommended:
Installing Information System Network Interface
The Information System Network (ISN) interconnects computers and terminals on a
customer's premises. When an ISN and System 75 or System 75 XE are collocated, voice and
data can be shared at the same information outlet as shown in Figure 3-141.
The voice pair that connects to a TN742 or TN769 Analog Line circuit pack port occupies the
first pair of the information outlet. The data pairs that connect to the ISN occupy the
second and third pairs of the information outlet. The voice and data pairs can be separated
as shown in Figure 3-141. The data pairs either connect to an Asunchronous Interface
Module (AIM) located in an ISN concentrator or the ISN packet controller.
The Z3A1 Asynchronous Data Unit (ADU) at the user room contains two 8-pin modular
jacks to accept the plugs on the line cords that connect to the information outlet and an
analog voice terminal. Normally, this ADU is powered from the connected data terminal.
The ADU can also be remotely or locally powered using a 2012D transformer equipped with
a 248B adapter. ADUs connected to receive-only printers always require external power.
The need for external power must be determined experimentally for ADUs connected to
other devices. For details on ADU installation, refer to the Z3A Asynchronous Data Unit
User's Manual, (555-401-701).
3-194
Switch
SELF TEST
LOC LOOP/REM LOOP
1200
AANS (PDM Only)
SIGLS
PRTY
1/0D
All Others
Switch Setting
AL OFF
OFF
ST
RDL OFF
DL OFF
HS ON
Setting
OFF
OFF
ON
ON
ON
ON
ON
OFF