AT&T System 25 - Manual (Page 260)

6.
7.
8.
9.
Voice
Check CP translations from the SAT to be sure that this CP has
Check LEDs on CP. The red LED will be lighted if a fault on the CP
affects all ports. Also, the red LED may be lighted if one or a few
ports are faulty.
Check Error Log for relevant messages.
Reseat the CP even if the red LED is dark. (See “Reseating and
Replacing Circuit Packs” under “Routine Maintenance” in this
section.) Replace the faulty CP.
Transmission Troubles
Symptoms:
Voice terminals not receiving tones.
Procedures:
1. Check
2 . C h e c k
S y m p t o m s :
that green LED on power supply is lighted.
power supply for voltages.
Many single-line sets or multibutton electronic telephone (MET) sets
are not able to dial correctly even though they are able to receive
c a l l s .
Procedures: Using a single-line voice terminal, test the touch-tone registers
as follows:
1. Go off-hook, and dial *3 and the 2-digit number (01 through 12) of
the touch-tone receiver to be tested. Receivers 01 through 04 are
on the ZTN85 or ZTN131 (R3) CP. Receivers 05 through 12 are
present only if the system has TN748B CP(s).
You will hear busy tone if the receiver is in use. You will
hear reorder tone if you misdialed or addressed a receiver
not in the system (for example, you dialed *305 and the
system does not have a TN748B CP). Try again.
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