Changing Level 2 Timers

This procedure is used to change the values of a level 2 timer set using the chg-l2t command.

The l2tset parameter specifies the level 2 timer set that is being changed. The EAGLE contains 35 level 2 timer sets that signaling links can be assigned to. Level 2 timer sets are assigned to different types of signaling links as shown in Table 3-16.

Table 3-16 Level 2 Timer Sets

Level 2 Timer Set (l2tset Parameter Value)	Default Level 2 Timer Set Value for Signaling Links	Type of Signaling Link
1 - 10	1	Low-speed ANSI signaling links
11 - 20	11	Low-speed ITU signaling links
21 - 25	21	ITU-N high-speed signaling links for China
26 - 30	26	ITU-N high-speed signaling links for areas other than China
31 - 35	31	Unchannelized T1 high-speed signaling links

Each level 2 timer set contains seven timers. These tables define the timers and their values.

Table 3-17 Level 2 Timer Values - Low-Speed ANSI Signaling Links

Level 2 Timers	Level 2 Timer Sets 1 - 10 (in milliseconds)
Timer 1 – Aligned ready (`t1` parameter)	5000 - 20000 System Default - 13000
Timer 2 – Not aligned (`t2` parameter)	5000 - 30000 System Default - 11500
Timer 3 – Aligned (`t3` parameter)	5000 - 20000 System Default - 11500
Timer 4 – Normal proving period (`t4npp` parameter)	500 - 5000 System Default - 2300
Timer 4 – Emergency proving period (`t4epp` parameter)	200 - 1000 System Default - 600
Timer 5 – Sending SIB (`t5` parameter)	40 - 500 System Default - 100
Timer 6 – Remote congestion (`t6` parameter )	1000 - 10000 System Default - 4000
Timer 7 – Excessive delay of acknowledgment (`t7` parameter)	200 - 3000 System Default - 1500
NODATA - See the Notes.	100 - 500 System Default - 100
Notes: The NODATA timer specifies the amount of time that must pass with no transmissions on a signaling link before the EAGLE interprets the condition as a signaling link failure or a terminal equipment failure and initiates changeover procedures. Note: The NODATA timer is configurable only for low speed SS7 links running BASIC Error Correction Method (ECM). The NODATA timer is not configurable for low speed SS7 links running PCR ECM. The NODATA timer value is calculated as T2 (L2 timer 2 value)/3 for low speed SS7 links running PCR ECM.

Table 3-18 Level 2 Timer Values - Low-Speed ITU Signaling Links

Level 2 Timers	Level 2 Timer Sets 11 - 20 (in milliseconds)
Timer 1 – Aligned ready (`t1` parameter)	40000 - 50000 System Default - 40000
Timer 2 – Not aligned (`t2` parameter)	5000 - 150000 System Default - 30000
Timer 3 – Aligned (`t3` parameter)	1000 - 2000 System Default - 2000
Timer 4 – Normal proving period (`t4npp` parameter)	7500 - 9500 System Default - 8200
Timer 4 – Emergency proving period (`t4epp` parameter)	400 - 600 System Default - 500
Timer 5 – Sending SIB (`t5` parameter)	80 - 120 System Default - 100
Timer 6 – Remote congestion (`t6` parameter )	3000 - 6000 System Default - 4000
Timer 7 – Excessive delay of acknowledgment (`t7` parameter)	500 - 2000 System Default - 1500
NODATA - See the Notes.	100 - 500 System Default - 100
Notes: The NODATA timer specifies the amount of time that must pass with no transmissions on a signaling link before the EAGLE interprets the condition as a signaling link failure or a terminal equipment failure and initiates changeover procedures. Note: The NODATA timer is configurable only for low speed SS7 links running BASIC Error Correction Method (ECM). The NODATA timer is not configurable for low speed SS7 links running PCR ECM. The NODATA timer value is calculated as T2 (L2 timer 2 value)/3 for low speed SS7 links running PCR ECM.

Table 3-19 Level 2 Timer Values - ITU-N High-Speed Signaling Links for China

Level 2 Timers	Level 2 Timer Sets 21 - 25 (in milliseconds)
Timer 1 – Aligned ready (`t1` parameter)	25000 - 350000 System Default - 150000
Timer 2 – Not aligned (`t2` parameter)	5000 - 150000 System Default - 130000
Timer 3 – Aligned (`t3` parameter)	1000 - 2000 System Default - 1000
Timer 4 – Normal proving period (`t4npp` parameter)	3000 - 70000 System Default - 30000
Timer 4 – Emergency proving period (`t4epp` parameter)	400 - 600 System Default - 500
Timer 5 – Sending SIB (`t5` parameter)	80 - 120 System Default - 100
Timer 6 – Remote congestion (`t6` parameter )	3000 - 6000 System Default - 5000
Timer 7 – Excessive delay of acknowledgment (`t7` parameter)	500 - 2000 System Default - 800

Table 3-20 Level 2 Timer Values - ITU-N High-Speed Signaling Links for Areas other than China

Level 2 Timers	Level 2 Timer Sets 26 - 30 (in milliseconds)
Timer 1 – Aligned ready (`t1` parameter)	25000 - 350000 System Default - 300000
Timer 2 – Not aligned (`t2` parameter)	5000 - 150000 System Default - 130000
Timer 3 – Aligned (`t3` parameter)	1000 - 2000 System Default - 1000
Timer 4 – Normal proving period (`t4npp` parameter)	3000 - 70000 System Default - 30000
Timer 4 – Emergency proving period (`t4epp` parameter)	400 - 600 System Default - 500
Timer 5 – Sending SIB (`t5` parameter)	80 - 120 System Default - 100
Timer 6 – Remote congestion (`t6` parameter )	3000 - 6000 System Default - 5000
Timer 7 – Excessive delay of acknowledgment (`t7` parameter)	500 - 2000 System Default - 800

Table 3-21 Level 2 Timer Values - Unchannelized T1 High-Speed Signaling Links

Level 2 Timers	Level 2 Timer Sets 31- 35 (in milliseconds)
Timer 1 – Aligned ready (`t1` parameter)	16000 - 151000 System Default - 151000
Timer 2 – Not aligned (`t2` parameter)	5000 - 14000 System Default - 14000
Timer 3 – Aligned (`t3` parameter)	5000 - 14000 System Default - 14000
Timer 4 – Normal proving period (`t4npp` parameter)	3000 - 30000 System Default - 30000
Timer 4 – Emergency proving period (`t4epp` parameter)	3000 - 10000 System Default - 3000
Timer 5 – Sending SIB (`t5` parameter)	80 - 120 System Default - 80
Timer 6 – Remote congestion (`t6` parameter )	3000 - 6000 System Default - 3000
Timer 7 – Excessive delay of acknowledgment (`t7` parameter)	500 - 2000 System Default - 500

The examples in this procedure are used to change the values of the level 2 timer set number 2.

Display the values of the level 2 timer set you wish to change.
Use the rtrv-l2t command, specifying the level 2 timer set to be changed. For this example, enter this command.

rtrv-l2t:l2tset=2

Note:
Timer sets are individual sets of timer configurations; each link is assigned one of these timer sets. This allows different links to have different level 2 timer settings. This is an example of the possible output.
```
rlghncxa03w 06-10-07 08:39:46 GMT  EAGLE5 39.0.0 
L2T TIMERS (IN SECONDS) 
L2TSET T1    T2    T3    T4NPP  T4EPP  T5   T6    T7    NODATA 
2      10.0  20.0  20.0  5.0    1.00   0.50 10.0  3.0   0.10
```
Change the values of the level 2 timer in this set using the chg-l2t command.
Refer to these tables for the values that can be used with the chg-l2t command. For this example, the values of the level 2 timer set number 2 that are being changed are T2 and T6. To change these two values, enter this command.
chg-l2t:l2tset=2:t2=15000:t6=5000:nodata=200

When this command has successfully completed, this message should appear.
```
rlghncxa03w 06-10-07 08:39:36 GMT  EAGLE5 36.0.0
CHG-L2T: MASP A - COMPLTD
```
Caution:
If the nodata parameter value is greater than 200 milliseconds, this message appears.
WARNING: If NODATA timer value is greater than 200 ms, links could go into congestion before link failure is declared.
Verify the changes using the rtrv-l2t command, specifying the level 2 timer set that has been changed.
For this example, enter this command.

rtrv-l2t:l2tset=2

This is an example of the possible output.
```
rlghncxa03w 06-10-07 08:39:46 GMT  EAGLE5 39.0.0
L2T TIMERS (IN SECONDS)
 L2TSET T1    T2    T3    T4NPP  T4EPP  T5   T6   T7    NODATA
 2      10.0  15.0  20.0  5.0    1.00   0.50 5.0  3.0   0.20
```

Back up the new changes using the chg-db:action=backup:dest=fixed command.

These messages should appear, the active Maintenance and Administration Subsystem Processor (MASP) appears first.

BACKUP (FIXED) : MASP A - Backup starts on active MASP.
BACKUP (FIXED) : MASP A - Backup on active MASP to fixed disk complete.
BACKUP (FIXED) : MASP A - Backup starts on standby MASP.
BACKUP (FIXED) : MASP A - Backup on standby MASP to fixed disk complete.

Figure 3-23 Changing Level 2 Timers