ATT System 25 Installation And Maintenance Manual

							4.Press the REWIND button, and wait for the unit to
tape. This step ensures that the tape is played from
Note:The systemautomatically compensates for
“leader” material at the beginning and end of the
Saving Translations
Follow these steps to save
1.
2.
3.
4.
5.
6.
7.
8.
translations on tape:
MAINTENANCE
fully rewind the
the beginning.
the clear
tape.
Complete the steps listed above under “Setting Up the DTU. ”
Press both the RECORD and PLAY buttons
unit should not yet begin to run.)
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 1.
The system responds with:
Save/Restore: Action= 1 Data=.
Enter D.
The system completes the word Data followed
Enter 1.
The system responds with:
Save/Restore: Action=1 Data=1
W24: YOU ARE ABOUT TO STARTsimultaneously.
by the = sign.
A TAPE SAVE
Keyboard input is blocked while doing tape operation
c to continue, any other key for abort
(The
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							MAINTENANCE
9.
10.Press c to continue, and the tape unit is automatically started by the
system. Saving translations on tape takes about 5 minutes and does
not affect switch performance.
When the save is complete, the unit stops automatically.
If the save is successful, the SAT displays:
SAVE COMPLETED SUCCESSFULLY.
Press the REWIND button and rewind the tape fully.
Verify the translations saved on the tape, followingthe steps in the
next procedure.
Verifying Translations
Always verify the translations saved to tape because of the possibility of
faults with cassettes or equipment. Successful completion of the Verify
function assures that saved translations match exactly the translations in the
system.
Note:Performing the Verify function takes about 5 minutes.
To verify translations saved to tape, follow these steps:
1.
2.
3.
4.
Complete the steps under “Setting Up the DTU” unless Verify is
being performed immediately after the Save function.
Press the PLAY button on the tape unit. (The unit should not yet
begin to run.)
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=.
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							MAINTENANCE
5.
6.
7.
.
8.
9.
10.
Enter 2.
The system responds with:
Save/Restore: Action=2 Data=.
Enter D.
The system completes the word Data followed by the = sign.
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
Press c to continue, and 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, time, task and feature release, and
customer’s name.Be sure the tape is stored in a safe place for
future access.
Note:Task and Feature release can be acquired by
pressing m on the SAT.
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.
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							MAINTENANCE
Restoring Translations
 Note: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.
2.
3.
4.
5.
6.
7.
Complete the steps under “Setting up the DTU,” using the cassette
on which translations were saved.
Press the PLAY button on the tape unit. (The unit will not run at this
time.)
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
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							MAINTENANCE
8.
9.
10.
11.Press c for continue, and 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”). If the
system has done a cold restart (which you can tell by reading the
restart message), the restoration was not successful.
If the restoration was not successful, repeat the restoration process
or escalate the problem to a higher support level.
Press the REWIND button to rewind the tape fully.
Be sure that the tape and the backup tape are labeled and dated
accurately and stored in a secure place for future access.
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							MAINTENANCE
ROUTINE MAINTENANCE
The following are general trouble-clearing techniques usually required to
resolve system-detected and/or user-detected troubles.
l Reseating and Replacing Circuit Packs
lRemoving and Restoring Power
lRestarting the System.
Reseating and Replacing Circuit Packs
Except for the CPU/Memory and Service CPs, power can be left on while a
CP is reseated or replaced.When possible, CPs should not be removed
when the amber LED is lighted.
Note:When a CP is removed from an unused slot (slot was being
used for storage), a“Port Board Out of Service” error
message is generated and the attendant Alarm LED flashes.
The error message must be removed from the Error Log.
To remove a CP:
1.
2.
3.
4.
5.
Remove cabinet front cover.
Make sure that 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.
Caution: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 degrees 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 CP.
Danger:The backplane contains hazardous voltages. Do
not touch the backplane during any maintenance
procedure. 
						

							MAINTENANCE
6.Inspect the cabinet backplane and 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. However, if any
connectors are damaged or corroded the CP should be replaced.
7.Rest the CP on a firm nonconducting surface, and press in all
socketed devices on the CP to be sure that they are firmly
connected. Ensure that all straps (if there are any) are firmly seated.
To Replace or Reseat a CP:
1.
2.
3.
4.
To reseat a CP, slide it back firmly in its slot. When it is almost back
in place, you’ll feel resistance and the removal lever will start to
return to its vertical position, flush with the edge of the CP.
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 the CP LEDs.Red LEDs should be dark.The
CPU/Memory CP green LED should flash. Green LEDs on all
translated port and trunk CPs should be lighted; amber LEDs may be
lighted or dark. The Service Circuit amber LED should be lighted or
flashing.
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Removing andRestoring Power
When the following procedures are performed, the system must be
unplugged from the ac power source:
l
l
l
lReseating or replacing the Service Circuit or CPU/Memory CPs
Replacing the frontplaneribbon connector between the Call
Processor and Memory CPs (Release 1 only)
Replacing the power supply
Replacing the fan assembly.
Danger: The System 25 cabinet(s)
This equipment must be
technicians..
Before removing power from one or
tape backup. To save translations,
Digital Tape Unit” in this section.
morecontain hazardous voltages.
serviced only by qualifiedcabinets, save translations on
follow the procedures under “Usingthe
the
To remove power from a cabinet, set the power switch on the rear panel of
the cabinet to the OFF (0) position. Unplug the cabinet power cord. When the
repair or replacement has been completed, restore power by plugging in the
cabinet power cord and setting the power switch to the ON (1) position. Note
that when power is removed from the first cabinet (contains the common
control circuits), the Emergency Transfer Unit automatically activates.
CAUTION: Removing a CP that is in use will cause users to be
disconnected. 
						

							MAINTENANCE
Restarting the System
The system automatically warm starts after power is restored. (The system’s
maintenance software may restart the system under certain self-detected
error conditions. ) There are two types of restart: cold and warm.
A Cold Start and limited 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. Current translations are
not retained. This means that all calls in progress are dropped.
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, but 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 CPU/Memory CP, lists all CPs in the system, by cabinet, and indicates
any invalid types/versions detected. When the Cold or Warm Start is
complete, the green LED on all CPs (except the CPU/Memory and Auxiliary
Trunk) should be lighted and the amber LED on the Service Circuit should be
flashing or steady. All red LEDs should be dark.
The system can also be restarted by entering commands at the SAT. Follow
these steps to manually restart the system from the SAT:
1.Confirm that the SAT is properly connected to the CPU/Memory CP
administration port.
2. If the SAT has a selectable baud rate, set it to 1200 baud.
3. Be sure that transmission parity is set to none and the parity bit is
set to space (0).
4. Turn the terminal on, and press the carriage return key once or
twice. On most terminals, this key is  or .
prompt is displayed:
Enter Password ->
5. Obtain the password from the System Administrator. Enter the
password, and press .The main menu and the
following prompt is displayed:
Make one selection from menu ->
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6.
7.
8.
9.Enter 9 (for the SAVE/RESTORE selection) and press .
The system responds with:
Action=
Enter 10 for a warm restart.
The system responds with:
Save/Restore: Action=10 Data=.
Enter D.
The system responds with:
Data=
10.Enter 1.
The system responds with:
Save/Restore: Action=10 Data=1
YOU ARE ABOUT TO FORCE A WARM START
c to continue, any other key for abort.
11.
Enter 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 ,
initiates a “full default” cold start; Data=2 initiates a limited cold start. See
the Administration Manual, 555-540-500, for a listing of default translations
provided by the system.
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.
Enter c to initiate the cold restart.
If you make any typing errors while entering information, press the
backspace key.Each time you press , one character is
erased.
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