ATT System 25 Installation And Maintenance Manual

MAINTENANCE
Figure 4-13.Clearing Switched Loop Attendant Console Troubles (Sheet
1 of 5) 

MAINTENANCE
4-13.
Clearing Switched Loop
2 of 5)Console Troubles (Sheet
4-95 

MAINTENANCE
Figure 4-13.Clearing Switched
3 of 5)Loop Attendant Console Troubles (Sheet
4-96 

MAINTENANCE
4-13.
Clearing Switched
4 of 5)Console Troubles
4-97 

MAINTENANCE
NOTES :
1. (a) System defaults to a DTAC when first powered up.
(b) You have to remove the DTAC before you can administer the
SLAC .
(c) System 25 can support 1 or 2 DTAC or 1 or 2 SLAC but not a
combination of both.
2. ID names can be assigned for PDCs,Trunks, FPDCs, and DGC groups.
(a)
(b)
(c)
(d)
3. You
Under Menu =1 or 2 (Port/PDC)
Action =90 Assign/Remove IDs 11 characters
Under Menu =1 (Port-Trunk Administration)
Action= 90 Assign/Remove Trunk IDs 11 characters
Under Menu= 5 (FPDC)...

MAINTENANCE
Special Port Circuit Options for Stations and Trunks
Tables 4-E and 4-F provide the special port circuit options that are administered
in the system. System defaults and associated action codes applicable to the
various port CPS are also shown.Procedures are available in the Administration
Manual for logging onto the system and accessing the information shown in
Table 4-E. The administrable items shown in Table 4-E should not be changed
unless CO and maintenance personnel agree that an item...

MAINTENANCE
Table 4-F.Applicable Actions for Circuit Pack Options
ACTIONS FOR CIRCUIT PACK OPTIONS
(See Circuit Pack Options—Table 4-E)
CIRCUITCPACTIONS
PACKTYPE32
333435363738,
ZTN76GS Boardllll
ZTN77LS Trunklll
l
ZTN78Tip/Ring Linell
TN742Analog Linellll
TN753
DID Trunkllll
TN760BTie Trunklllll
TN763Aux Trunkll
TN767DS1 Interfacellll
Note: TN747 same as ZTN76 and ZTN77. TN746B same as TN742.
Data Line Troubles
Symptoms:
Data terminals connected through the Data Line CP (TN726) are dead
or are not...

6.
7.
8.
9.
10.
11.
12.
13.
14.
If +7 volts are not present, the ADU is not receiving enough power
from the data terminal and must be locally powered.
If the ADU is powered from a local transformer, make sure that a 3-
pair or 2-pair modular cord is connected between the transformer
and the ADU.
Using a 4-pair modular jack breakout
ac voltage between pins 7 and 8 is
about 28 volts for an open circuit.box, check to be sure that the
about 14 volts under load or
Even with alternate power, the data terminal...

MAINTENANCE
Multiple Troubles or Trouble That Cannot Be Diagnosed
Symptoms:
Red LED is lighted on all port CPs. SAT displays this message:
“FAIL:
CPU:ARCHANGELINSANE:CHECK ZTN85:
TERMINATOR?”.
Procedures:
1.
2.
3.
4.
5.
Check that the TDM bus terminator card(s) is installed in the rear pin
field(s).
Note:The CPU/Memory CP provides built-inbus
termination circuitry for one end of the bus, and the
TDM bus termination card is used to terminate the
other end.
Reseat the CPU/Memory and Service CPs (see...

MAINTENANCE
Symptoms:
Red LED is lighted cm several port CPs.
Procedures:
1.
2.
3.
4.
.
Check the power supply to be sure that it is providing correct
voltages (see “Power Supply Trouble’ ‘).
Check the frontplane connector and the CPU/Memory CP, and
replace any faulty unit(s).
Reseat any CPs where the red LED is still lighted. After reseating a
CP, if the red LED remains lighted, replace the CP.
If troubles persist, check the backplane for signs of shorts or other
troubles. A port CP with trouble may be...