ATT System 25 Installation And Maintenance Manual

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

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4-13.
Clearing Switched Loop
2 of 5)Console Troubles (Sheet
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Figure 4-13.Clearing Switched
3 of 5)Loop Attendant Console Troubles (Sheet
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4-13.
Clearing Switched
4 of 5)Console Troubles
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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)
Action =5 Assign/Remove FPDC IDs 11 characters
Under Menu= 6 (DGC)
Action =14 Assign/Remove DGC
Access Code IDs 11 characters
(Only 9 characters are displayed).
either have automatic hold or automatic release. If automatic
hold is set, you do not have automatic release.
4. (a) Back-up recommended to be an ATL set.
(b) Cannot remove back-up station until POS-Busy button is removed
from SLAC.
(c) Back-up station will be removed automatically when second SLAC
is administered.
Figure 4-13.Clearing Switched Loop Attendant Console Troubles (Sheet
5 of 5)
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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 needs changing.
Table 4-E.Station/Trunk/Special Port Circuit Pack Options
CIRCUIT PACK-OPTIONS
(See Applicable Actions-Table 4-F)
DEFAULT
ACTIONDESCRIPTIONDATA
[500]
CO Disconnect Time (in 20-msec
increments)(0-2540) Msecs32
End-to-End Signaling Tone Timing
(in 20-msec increments)
33
FOR TN742 AND ZTN78 ONLY:
FOR ALL OTHER BOARDS:(20-2540) Msecs
(0-2540) Msecs[340]
[60]
End-to-End Signaling Pause Timing
(in 20-msec increments)
34
[60]
[  ]
FOR TN742 AND ZTN78 ONLY:
FOR ALL OTHER BOARDS:(20-2540) Msecs
(0-2540) Msecs[100]
Hybrid Balance1- Resistor
0 - Resistor/Capacitor
35
 * 
1- Gain = 3db
0- Gain = 0db[0]36Gain
0 - Type I Compatible
1- Type V
2- Type I[2]
37E&M Signaling Type
[300]
Answer Supervision Delay Timing(0-51 00) Msecs
38
* Default depends on CP type. Trunk ports are defaulted to 0 (RC termination)
while station ports are defaulted to 1 (R termination).
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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 functioning properly.
Procedures:
1.Check that the RS-232C connector on the Asynchronous Data Unit
(ADU) is properly connected to the RS-232C connector on the data
terminal. Always tighten connector screws and fasteners.
2. Check the terminal ac power connection.
3. Make sure that the connection to the ADU is a 4-pair modular plug.
4. Check the ADU ac power connection (see Steps 5, 6, and 7). An ADU
connected to a port on the CPU/Memory CP must have a local ac power
source. Briefly disconnect the ADU’s power cord.
5. If the ADU is not externally powered, check pin 20 (DTR signal on the
RS-232C connector) for presence of at least +7 volts relative to pin 7
(ground).
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							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 needs to deliver at least
3 volts on pin 20 (DTR signal).
Check the data terminal settings that have been administered at the
SAT to be sure that the administered settings match those of the
data terminal. Settings should be for 8 bits, no parity with O in the
parity bit.Check the baud rate settings. Even if the terminal
accommodates autobaud rate, the administered settings must
include the baud rate.
If the data port is administered for“long break” disconnects, check
to be sure that breaks from the terminal are at least 2 seconds. If
they are not, or if the break length cannot be determined, insert a
device with a disconnect button in the line and enter 2-second
breaks.
Check wiring.
If none of the preceding procedures correct the terminal troubles,
change the ADU.
If the problems persist, replace the Data Line CP.
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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 “Reseating and
Replacing Circuit Packs” under “Routine Maintenance” in this
section).
If troubles persist, replace units in this order: TDM bus terminator
card; Service Circuit CP; CPU/Memory CP. Recheck the system
after each unit has been replaced to see if the trouble is clear.
If troubles still persist, check the intercabinet cabling.
If troubles cannot be cleared, escalate to higher level maintenance.
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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 providing a logic “1” or “O”
onto the backplane causing other port CPs to experience trouble
also. In multiple-cabinet systems, move CPs that are suspected of
being faulty to another cabinet to help identify 
CP or backplane
trouble (see “Backplane and Cabinet Trouble”).
Symptoms:
Troubles cannot be fixed or diagnosed.
Procedures:
1.
2.
3.
4.
Force a cold restart of the system from the SAT (see “Restarting the
System” under “Routine Maintenance” in this section).
Read in the latest tape containing system translations (see “Using
the Digital Tape Unit” in this section).
Check the LEDs on the CPU/Memory CP. Check the Error Log for
relevant messages.
If troubles persist, follow established escalation procedures.