ATT System 25 Maintenance Manual

							OPERATING THE DIGITAL TAPE UNIT
7.
8.
9.
10.Enter 1. The system responds with the complete line:
Save/Restore: Action=2 Data=1
W25: YOU ARE ABOUT TO START A TAPE VERIFY
c for continue, any other key for abort
The tape unit is automatically started by the system. Verifying
translations takes about 5 minutes.
When verification is complete, the unit stops automatically.
If verification is successful, the SAT displays:
(feature code issue, date, time, size)
followed by:
VERIFY COMPLETED SUCCESSFULLY.
Press the REWIND button to rewind the tape fully.
Label the tape with the date and time. Be sure the tape is stored in a
safe place for future access.
Repeat both the Save and Verify procedures for a backup tape.
Label and date both tapes accurately and be sure they are stored in a
secure place for future access.
Restoring Translations
CAUTION: Restoring translations from tape removes the system from
operation for about 5 minutes.
When it is necessary to restore system translations from tape, follow these
steps:
1.Complete the steps in the Setting up the DTU section, using the
cassette on which translations were saved.
2.Press the PLAY button on the tape unit. (The unit will not run at this
time.)
7-4 
						

							OPERATING THE DIGITAL TAPE UNIT
3.
4.
5.
6.
7.
8.
9.Log on to the SAT, if not already logged on.
The system displays the main menu prompt:
Make one selection from menu ->.
Enter 9 for the SAVE/RESTORE selection.
The system responds with:
Action=, Enter 3.
The system responds with:
Save/Restore: Action=3 Data=.
Enter D. The system completes the word Data followed by the =
sign.
Enter 1. The system responds with:
Save/Restore: Action=3 Data=1
W26: YOU ARE ABOUT TO START A TAPE RESTORE
c for continue, any other key for abort
The tape unit is automatically started by the system. Restoring
translations takes about 5 minutes.
When restoration is complete, the unit stops automatically.
If restoration is successful, the SAT displays:
(feature code issue, date, time, size)
followed by:
RESTORE COMPLETED SUCCESSFULLY
Initiated warm start
If above message is not displayed on the SAT, restoration was
probably not successful. Force a warm start of the system and check
the restart message (see Restarting the System in Section 8). If
the system has done a cold restart (which you can tell by reading the
restart message), the restoration was not successful.
7-5 
						

							OPERATING THE DIGITAL TAPE UNIT
10.
11.
12.In the event of an unsuccessful restoration, repeat the restoration
process. Otherwise, escalate the problem to a higher support level.
Press the REWIND button to rewind the tape fully.
Be sure the tape and the backup tape are labeled and dated
accurately and stored in a secure place for future access.
7-6 
						

							CLEARING SYSTEM-DETECTED TROUBLES
Most troubles are detected and reported via the Alarm light-emitting diode
(LED) located on the Attendant Console, the error log, and, in some cases,
the LEDs on the circuit packs (CPs). The following covers general trouble-
clearing techniques and recommends procedures for identifying and clearing
a variety of specific system troubles:
General Trouble-Clearing Techniques
l Consulting Error Log
l Reseating and Replacing Circuit Packs
l Removing and Restoring Power
l Restarting the System
l Interpreting Circuit Pack LEDs.
Consulting Error Log
Consulting the error log should be the first step in diagnosing system-related
troubles (refer to Section 6 Error Log for instructions on accessing error
log records).
Reseating and Replacing Circuit Packs
Except for the Memory, Call Processor, and Service CPs, power can be left
on while a CP is reseated or replaced. When possible, CPs should not be
removed when the yellow LED is On.
CAUTION: Removing a CP that is in use may cause users to be
disconnected.
8-1 
						

							CLEARING SYSTEM-DETECTED TROUBLES
Note:When you remove a CP from an unused slot (slot was being used
for storage), a Port Board Out of Service error message is
generated by the missing CP and the attendant Alarm LED flashes.
You must remove the error message from the Error Log.
To remove a CP:
1.
2.
3.
4.
5.
6.
7.
Remove cabinet front cover.
Make sure your hands are clean and dry. Put on a wrist grounding
strap and attach it to the metal grounding block on the back of the
cabinet to discharge static electricity.
WARNING: Static electricity can damage a CP.
With your thumb, pull up on the latch of the removal lever.
When the latch is up, pull the removal lever down until it stops, at an
angle of about 30° to the floor.
Pull the CP out a few inches, tugging hard, then slide the CP the rest
of the way out of the carrier. Use both hands when removing a circuit
pack.
DANGER:Do not touch the backplane when performing any
maintenance procedure. The backplane contains
hazardous voltages.
Inspect the cabinet backplane and also inspect the connectors at the
back of the CP. It may be possible to clean dirty connectors per
prescribed procedures and return the CP to service. If any
connectors are damaged or corroded, however, replace the CP.
Rest the CP on a firm non-conducting surface and press in all
socketed devices on the CP to be sure they are firmly connected.
Insure that all straps (if there are any) are firmly seated.
8-2 
						

							CLEARING SYSTEM-DETECTED TROUBLES
8.
9.
10.
11.
To reseat a CP, slide it back firmly in its slot. When it is almost back
in place, youll feel resistance and the removal lever will start to return
to its vertical position, flush with the edge of the circuit pack.
Push the lever all the way to vertical, until it catches on the latch.
The red LED on the CP lights for up to 4 seconds during self-testing
and then goes dark when the self-test is okay. If the CP has already
been translated, the green LED lights.
Recheck CP LEDs. Red LEDs should be dark. The Call Processor
green LED should flash. Green LEDs on all translated port and trunk
CPs should be lighted; yellow LEDs may be lighted or dark. The
Service Circuit yellow LED should be lighted or flashing.
Removing and Restoring Power
The following procedures require the system to be unplugged from the ac
power source:
lReseating or replacing Service Circuit, Call Processor, or Memory CPs
lReplacing frontplane ribbon connector between the Call Processor and
Memory CPs
lReplacing power supply
lReplacing fan assembly.
DANGER:The System 25 cabinet contents are not user serviceable.
Some voltages inside the cabinets are hazardous. This
equipment is to be serviced only by qualified technicians.
Before removing power from one or more cabinets, save translations on the
tape backup unit, following the steps in Section 7 Operating the Digital Tape
Unit. 
To remove power from a cabinet, set the power switch on the rear panel of
the cabinet to the OFF (0) position and unplug the cabinets power cord.
Once the repair or replacement has been completed, restore power by
plugging the cabinet back in and setting the power switch back to the ON (1)
position. Note that whenever power is removed from the first cabinet
(contains the common control circuits), the Emergency Transfer Unit is
automatically activated.
8-3 
						

							CLEARING SYSTEM-DETECTED TROUBLES
Restarting the System
The system automatically warm starts after power is restored. (The systems
maintenance software may restart the system under certain self-detected
error conditions.) There are two types of restart: cold and warm.
A Cold Start (which takes about 4 to 5 minutes) causes the system to check
all slots for valid CP types and assign default translations to all ports, except
auxiliary trunk ports.
A Warm Start (which takes about 3 minutes) causes the system to check all
slots for valid CP types but does not assign default translations. Current
translations are retained, though all call status information is cleared. This
means that all calls in progress are dropped.
During a Cold or Warm Start, the SAT lists the version of the firmware loaded
in the Call Processor and Memory CPs and lists all CPs in the system, by
cabinet, and indicates any invalid types/versions detected. When the Cold or
Warm Start is complete, every CP (except the Memory and Auxiliary Trunk)
should show a green LED; in addition, the yellow LED on the Service Circuit
should be flashing or steady. No red LEDs should be on.
The system can also be restarted by entering commands at the SAT. Follow
these steps to manually restart the system from the SAT:
1.
2.
3.
4.
5.
Confirm that the SAT is properly connected to the processor CP
administration port.
If the SAT has a selectable baud rate, set it to 1200 baud.
Be sure transmission parity is set to none, with the parity bit set to
space (0).
Turn on the terminal and press the carriage return character once or
twice. On most terminals, this key is  or .
After communication with the system is established, a prompt is
displayed:
Enter Password ->.
Obtain the password from the system administrator. Enter the
password and press . The main menu is displayed along
with the prompt:
Make one selection from menu ->.
8-4 
						

							CLEARING SYSTEM-DETECTED TROUBLES
6.Enter 9 (for the SAVE/RESTORE selection) and press .
7.The system responds with:
Action=, Enter 10 for a warm restart.
The system responds with:
Save/Restore: Action=10 Data=.
8.Enter D. The system completes the word Data followed by the =
sign.
9.Enter 1. The system responds with:
Save/Restore: Action=10 Data=1
You are about to initiate a warm start
c to continue, any other key to abort.
10.
Press the character c to initiate the warm restart.
To perform a cold restart, follow the preceding steps for Restarting the
System, except enter 20 after Action=. Enter 1 or 2 after Data=. Data=1 will
initiate a full default cold start; Data=2 (V2 only) initiates a limited cold
start. See the Administration Manual for R1V2 (555-520-500) for a listing of
default translations provided in Version 2 systems. The system responds
with:
Save/Restore: Action=20 Data=1 (or Data=2)
You are about to initiate a cold start
c to continue, any other key to abort.
Press the character c to initiate the cold restart.
If you make any typing errors while entering information, press the
backspace key. Each time you press this key, one character is erased.
Messages displayed on the SAT indicate which restart is being performed.
Cold and warm restarts both display the same type of information. This is a
listing of the version of the firmware loaded in the Call Processor and
Memory CPs, followed by a configuration listing of all CPs recognized by the
system. Note that the Memory and Call Processor CPs are not listed in the
configuration listing. They should be located in slots 1 and 2, respectively, of
Cabinet 1.
8-5 
						

							CLEARING SYSTEM-DETECTED TROUBLES
Table 8-A provides a listing of SAT messages that may be displayed during a
cold or warm restart. The displayed message is a result of CP occupancy,
type, and port translations.
Table 8-A. Displayed SAT Messages During Cold or Warm Restart
CIRCUIT PACK (CP)PORTDISPLAYED
IN SLOTTRANSLATEDMESSAGE
NoYesMissing
Yes
NoCP Type Listed *
YesYesCP Type Listed
YesYes (doesnt matchMismatch
physical CP)
Yes (UnsupportedYes or No
Illegal
CP Type)
* Mark indicating that the CP is unused.
8-6 
						

							CLEARING SYSTEM-DETECTED TROUBLES
The SAT message for a cold restart appears after the system has performed
all self-tests and reading of its configuration. The time required for a cold
start is a function of the number of CPs in the system but is generally several
minutes. A typical Version 1 cold restart SAT message is as follows:
Note:A Version 1 message lists five MEM ROM pairs while a Version 2
message lists eight MEM ROM pairs.
RESTART
CPU ROM pair
MEM ROM pair
MEM ROM pair
MEM ROM pair
MEM ROM pair
MEM ROM pair
COLD START
SLOT
1
2
3
4
5
6
7
8
9
10
11
12
1: version 1.24 *
1: version 1.46.1 *
2: version 1.46.1 *
3: version 1.46.1 *
4: version 1.46.1 *
5: version 1.46.1 *
CABINET 1CABINET 2    CABINET 3
TN735
TN742
ZTN85TN753
ZTN79TN760B
ZTN79TN760B
ZTN79TN760B
ZTN78
ZTN78
ZTN78
TN747
TN747
TN748
* This is important information that should be noted in trouble reports.
Enter . The system responds with the administration prompt:
SYSTEM 25 ADMINISTRATION
(CPU and Memory release information)
Enter password -->
The SAT message for a warm restart appears more quickly. The warm restart
message is identical to the cold restart message except that WARM
START appears between the firmware version listing and the configuration
listing.
8-7