AT&T System 25 - Manual (Page 258)

MAINTENANCE
CLEARING USER-DETECTED TROUBLES
User-reported troubles are usually associated with voice or data terminal
equipment or trunks. They can result from system-detected errors and are
often solved by clearing system error conditions or alarms.
This section presents trouble-clearing techniques and procedures for user-
reported troubles.
Maintenance routines for data terminals and Asynchronous Data Units (ADUs)
are not contained in this section (although some basic routines for clearing
administration equipment troubles are included). Manuals covering data
terminals and data modules are listed in Section 5, “References.”
Maintenance for auxiliary devices that are customer provided is the
responsibility of the user.
Administration Equipment Troubles
Administration equipment that is connected to the system on a dedicated
basis includes the System Administration Terminal (SAT), Station Message
Detail Recording (SMDR), and Digital Tape Unit.
Symptoms: .
Terminal dead or functioning intermittently. Messages contain
“garbage” characters.
Procedures:
1.
2.
3.
4.
Check ac power connection.
Check cabling to cabinet.
Check administered settings for SAT (see the Administration Manual).
Settings should be for 8-bit word length, no parity, space (0) for bit
8;baud rate 1200.
Check pin 20 of
steady at greater
( g r o u n d ) . EIA connector for DTR signal. Signal should be
than or equal to +3.0 volts with respect to pin 7
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