AT&T System 25 - Manual (Page 269)

MAINTENANCE
8.
9.
10.
11.
12.
If the problem does not move, replace the Ground Start CP.
If the problem moves, the fault is with the CO. Notify CO personnel
through the proper channels.
If “Ringing no ground” is displayed, the T and R leads may be
reversed in the trunk access wiring. The T lead should have ground,
and the R lead should have –48 volts. These can be verified by
reversing the ground and ring leads and checking with either a
voltmeter or a test set (with a polarity switch). A voltmeter should
indicate the presence
when the Ring lead is
“Ringing no ground”
on the Ground Start
necessary.
"Ringing no ground”
of 48 volts. A test set should provide dial tone
temporarily grounded.
may also mean that the ground detect circuit
CP is faulty. Check and replace this CP if
may also mean that the CO is unable to send
ground. If this is the problem, notify the CO through the proper
channels.
DID Trunks Troubles
Symptoms:
User complaints that DID trunks are not operating properly (for
example, callers hear ringing, but users do not hear ringing at voice
terminals).
P r o c e d u r e s :
1. Check the trunk translations via the SAT to be sure that trunks have
been properly translated. (See the
Administration Manual.)
2. Check the Error Log for messages such as:
●
Rotary dial
●
Rotary dial
●
Rotary dial
before wink
pulse too early
pulse during wink
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