Instruction manual

TECHNICAL SPECIFICATIONS
Port Specifications
The following tables provide interface specifications for System 25 line and trunk port
circuits:
DATA TERMINAL PORTS (Note)
STATION TYPE
CIRCUIT PACK DATA TERMINAL SPECIFICATIONS
EIA RS-232 Device Via
Data Line
RS-232 device must furnish
ADU
(TN726)
signals on ADU pins 2 (TD)
and 20 (DTR) and ground on
either pin 1 or 7. The ADU
furnishes signals on pins 3
(RD) and 8 (CD). The CD
signal is also tied to pins 5
(CTS) and 6 (DSR). Some
data terminals may require
auxiliary power when used
with a Z3A1, Z3A2, or Z3A4
ADU (the Z3A5 always
requires local power). ADUs
require 7 volts on pin 20 (DTR)
to operate properly. The
following table lists data
terminals that have been
tested and are known to
operate properly without
auxiliary power.
Note:
Refer to Cable Distance Limitations for supported data rates.
5-12