Mike's PBX Cookbook

Daily Routines

The Meridian 1 can be set to run diagnostic overlay programs at a specified time, normally in a quiet traffic period (eg, at midnight). The automatic daily running of diagnostic overlays helps to identify and correct faults before users become aware of them.

When the Meridian 1 detects a fault during daily routines, it will automatically run a diagnostic program, overlay program 45, to identify and report the fault condition. A Data Save/Dump (LD 43) is also be performed during the daily routines.

Which Overlays are run

You can check which overlays are set to run on your system, and at what time, by printing the Configuration Record (CFN) in LD 22. This provides a lot of information, but the part pertaining to background and daily routine tasks is shown in the "OVLY" section. You may also print just the overlay data, by entering OVLY at the TYPE prompt.

For example:

>LD 22
REQ  prt
TYPE ovly

  SID  0                       System ID number
  BKGD 044                     Background Overlay task (44: Software Audit)
  FR44 1                       Frequency control of Overlay 44 in background
  PBXH X                       Hour to perform Message Waiting lamp maintenance, X to disable
  TODR 00                      Time of Daily Routines (Midnight)
  DROL 043 045 060 135 137     Daily Routine Overlays
  MID_SCPU NO                  Midnight Switch CPU Allow or deny (CPP systems only)
  CY45 00                      Cycles LD 45 can be run whenever a fault is detected
  MULTI_USER ON                Multi-User Log In

Adding Overlays to the Daily Routines

This is done in LD 17.

REQ  chg
TYPE ovly
DROL 30 34                     Add overlays separated by space, X to remove

Valid Background overlays:   30, 33, 34, 35, 36, 37, 38, 40, 41, 43, 44, 45, 46, 53, 135
Valid Daily Routine overlays: 30, 32, 33, 34, 35, 36, 37, 38, 40, 41, 43, 44, 45, 46, 51, 53, 60, 61, 135

To remove an overlay, type X before the overlay number.

It is good practice to always perform a data dump after making any programming changes.

>LD 43
. edd                        Perform an Equipment Datadump (data save)

Midnight CPU Switchovers

As the newer Pentium Call Processors are more 'robust', an automatic daily core swap is no longer required and has been removed from the default daily routine. However, it's still possible to perform a daily core switchover during the midnight routine if desired:

>LD 17
REQ chg
TYPE ovly
DROL 135                     Add 135 to Daily Routine Overlays
MID_SCPU yes                 Midnight Switch CPU: Allow (NO will test 3PE only, with LD 135)

Avaya recommends:

These recommendations apply to all dual processor systems.

Manual core switch test: In LD 135, ensure the system is redundant with STAT CPU, and enter SCPU to manually switch cores.
A graceful switchover causes a 6 to 10 second service interruption, an ungraceful switchover takes a little longer (excess of 1 min).

Generally, established basic calls survive both the graceful and ungraceful switchovers. Basic calls that are in a transient state (for example, calls that are in the dialing state) survive a graceful switchover but do not survive an ungraceful switchover.

Checking the Daily Routine output

There are two ways you can do this. The simplest way is to leave the maintenance terminal or printer on/connected overnight, and check the output in the morning. PuTTY is useful due to its "scroll-back buffer" which should be set to the maximum size.

Alternatively, you can read the System Event List (SEL) with LD 117. This is also useful for checking other system event messages.

For example:

>LD 117
=> prt sel 20                printout length maybe 0-(20)-SELSIZE
Printing [4%] (20 of 500) most recent events
TDS   LD34  BEGIN  13:42   8/8/2001

This will print the most recent records in system event list. SELSIZE is usually 500 (PRT SELSIZE to find the setting), meaning the system event log will hold 500 events. The SEL is also searchable using the BROWSE SEL FIND XXXX command.

You can also manually invoke the routines, and watch the output.

>ld 135
.****                        exit the overlay to start DAILY ROUTINES
TDS   LD34  BEGIN  13:42   8/8/2001  

The MIDN command (in LD 135) will run the routines after LD 135 is exited.

Typical results

Normally, no problems should occur. A typical printout will show each overlay in the DROL list starting and exiting normally. Any problems will be shown by the relavent system message, SCH, ERR, etc. Again, these messages will be stored in the system event log.

DTIM  LD60  BEGIN  00:04   8/8/2001

DTIM  LD60  END  00:04   8/8/2001

CCED  LD135  BEGIN  00:04   8/8/2001

CCED  LD135  END  00:04   8/8/2001


The 'AUD0000' is the output from LD 44 (Software Audit) and indicates that an error free audit pass was made. No errors detected. System software OK. No action to be taken. Happy, happy!

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