Removing an SS7 Signaling Link

This procedure is used to remove an SS7 low-speed, ATM, E1, E1 high-speed, or T1 signaling link from the database using the dlt-slk command. To remove other types of signaling links from the database, go to one of these procedures.

The link to be removed must exist in the database. This can be verified in 1 .

The dlt-slk command uses these parameters.

:loc – The card location of the LIM that the SS7 signaling link is assigned to.

:link – The signaling link on the card specified in the loc parameter.

:force – This parameter must be used to remove the last link in a linkset without having to remove all of the routes that referenced the linkset.

The tfatcabmlq parameter (TFA/TCA Broadcast Minimum Link Quantity), assigned to linksets, shows the minimum number of links in the given linkset (or in the combined link set in which it resides) that must be available for traffic. When the number of signaling links in the specified linkset is equal to or greater than the value of the tfatcabmlq parameter, the status of the routes that use the specified linkset is set to allowed and can carry traffic. Otherwise, these routes are restricted. The value of the tfatcabmlq parameter cannot exceed the total number of signaling links contained in the linkset.

If the linkset type of the linkset that contains the signaling link that is being removed is either A, B, D, E, or PRX, the signaling link can be removed regardless of the tfatcabmlq parameter value of the linkset and regardless of the LSRESTRICT option value. When a signaling link in one of these types of linksets is removed, the tfatcabmlq parameter value of the linkset is decreased automatically.

If the linkset type of the linkset that contains the signaling link that is being removed is C, the signaling link can be removed only:

If the LSRESTRICT option is off. The LSRESTRICT option value is shown in the rtrv-ss7opts output.
If the LSRESTRICT option is on and the number of signaling links assigned to the linkset will be equal to or greater than the value of the tfatcabmlq parameter value of the linkset after the signaling link is removed.
The tfatcabmlq parameter value of the linkset is shown in the TFATCABMLQ column of the rtrv-ls:lsn=<linkset name> output. The tfatcabmlq parameter value can be a fixed value (1 to 16) or 0. If the tfatcabmlq parameter value of the linkset is a fixed value, the number of signaling links that are in the linkset after the signaling link is removed must be equal to or greater than the tfatcabmlq parameter value of the linkset.

If the tfatcabmlq parameter value is 0, the signaling link can be removed. When the tfatcabmlq parameter value is 0, the value displayed in the TFATCABMLQ column of the rtrv-ls output is 1/2 of the number of signaling links contained in the linkset. If the number of signaling links in the linkset is an odd number, the tfatcabmlq parameter value is rounded up to the next whole number. As the signaling links are removed, the tfatcabmlq parameter value of the linkset is decreased automatically.

The signaling link cannot be removed from the database if link fault sectionalization (LFS) tests are being performed on it. This can be verified using the rept-stat-lfs command.

Canceling the RTRV-SLK Command

Because the rtrv-slk command used in this procedure can output information for a long period of time, the rtrv-slk command can be canceled and the output to the terminal stopped. There are three ways that the rtrv-slk command can be canceled.

Press the F9 function key on the keyboard at the terminal where the rtrv-slk command was entered.
Enter the canc-cmd without the trm parameter at the terminal where the rtrv-slk command was entered.
Enter the canc-cmd:trm=<xx>, where <xx> is the terminal where the rtrv-slk command was entered, from another terminal other that the terminal where the rtrv-slk command was entered. To enter the canc-cmd:trm=<xx> command, the terminal must allow Security Administration commands to be entered from it and the user must be allowed to enter Security Administration commands. The terminal’s permissions can be verified with the rtrv-secu-trm command. The user’s permissions can be verified with the rtrv-user or rtrv-secu-user commands.

For more information about the canc-cmd command, go to the Commands Manual.

Display the current link configuration using the rtrv-slk command. This is an example of the possible output.

rlghncxa03w 09-07-19 21:16:37 GMT EAGLE5 41.1.0

                                   L2T               PCR  PCR
LOC  LINK LSN         SLC TYPE     SET  BPS    ECM   N1   N2
1201 A    ls01         0  LIMDS0   1    56000  BASIC ---  -----
1201 B    lsa1         0  LIMDS0   1    56000  BASIC ---  -----
1202 B    ls02         0  LIMDS0   2    56000  BASIC ---  -----
1203 A    ls03         0  LIMDS0   3    56000  BASIC ---  -----
1203 B    lsa2         0  LIMDS0   1    56000  BASIC ---  -----
1204 B    ls01         1  LIMDS0   1    56000  BASIC ---  -----
1205 A    lsa3         0  LIMDS0   4    56000  BASIC ---  -----
1206 A    ls02         1  LIMDS0   2    56000  BASIC ---  -----
1207 A    lsn1207a     0  LIMDS0   1    56000  BASIC ---  -----
1207 B    lsn1207b     0  LIMDS0   1    56000  BASIC ---  -----
1208 B    ls03         1  LIMDS0   3    56000  BASIC ---  -----
1212 A    ls04         0  LIMDS0   4    56000  BASIC ---  -----
1213 B    ls05         0  LIMDS0   5    56000  BASIC ---  -----
1214 A    lsn1214a     0  LIMDS0   2    56000  BASIC ---  -----
1214 B    lsa3         1  LIMDS0   4    56000  BASIC ---  -----
1215 A    ls05         1  LIMDS0   5    56000  BASIC ---  -----
1301 B    ls06         0  LIMDS0   6    56000  BASIC ---  -----
1304 B    ls06         1  LIMDS0   6    56000  BASIC ---  -----
1308 A    ls06         2  LIMDS0   6    56000  BASIC ---  -----
1311 A    ls01         2  LIMDS0   1    56000  BASIC ---  -----
1311 A1   ls05         2  LIMDS0   5    56000  BASIC ---  -----
1311 B    ls03         2  LIMDS0   3    56000  BASIC ---  -----
1311 B1   ls07         1  LIMDS0   7    56000  BASIC ---  -----
1313 A    ls07         0  LIMDS0   7    56000  BASIC ---  -----
1315 A    lsn5         0  LIMDS0   11   56000  BASIC ---  -----
1317 A    lsi7         0  LIMDS0   11   56000  BASIC ---  -----

                                   LP            ATM
LOC  LINK LSN         SLC TYPE     SET  BPS      TSEL      VCI    VPI   LL
1302 A    atmansi0     0  LIMATM   3    1544000  EXTERNAL  35     15    0
1305 A    atmansi1     0  LIMATM   4    1544000  INTERNAL  100    20    2
1318 A    atmansi0     1  LIMATM   9    1544000  LINE      150    25    4

                                   LP         ATM                    E1ATM
LOC  LINK LSN         SLC TYPE     SET BPS    TSEL     VCI   VPI  CRC4 SI SN
2101 A    atmitu1      0  LIME1ATM 5   2.048M LINE     150   2    ON   1  20
2105 A    atmitu1      1  LIME1ATM 5   2.048M LINE     35    15   ON   2  15

SLK table is (31 of 1200) 3% full

Display the linkset that contains the signaling link that is being removed by entering the rtrv-ls command with the name of the linkset shown in the LSN column of the rtrv-slk output.

For this example, enter this command.

rtrv-ls:lsn=ls04

This is an example of the possible output.

rlghncxa03w 10-07-17 11:43:04 GMT EAGLE5 42.0.0

                                 L3T SLT              GWS GWS GWS
LSN           APCA   (SS7)  SCRN SET SET BEI LST LNKS ACT MES DIS SLSCI NIS
ls04          002-009-003   scr2 1   1   no  a   1    on  off on  no    off

              SPCA          CLLI         TFATCABMLQ MTPRSE ASL8
           ---------------- -----------  1          no     no
       
           RANDSLS
           off

           ISLSRSB RSLS8
           1       no

           IPSG  IPGWAPC  GTTMODE           CGGTMOD
           no    no       CdPA               no

                                  L2T               PCR  PCR
           LOC  LINK SLC TYPE     SET  BPS    ECM   N1   N2
           1212 A    0   LIMDS0   1    56000  BASIC ---- ------

Link set table is ( 20 of 1024)  2% full

If the linkset type of the linkset is A, B, D, E, or PRX, continue the procedure with 5.

If the linkset type of the linkset is C, continue the procedure with 3.

Display the LSRESTRICT option value by entering the rtrv-ss7opts command.
This is an example of the possible output.
```
rlghncxa03w 10-07-30 15:09:00 GMT  42.0.0

SS7 OPTIONS
-----------------------
LSRESTRICT     on
```
Note:
The rtrv-feat command output contains other fields that are not used by this procedure. If you wish to see all the fields displayed by the rtrv-feat command, refer to the rtrv-feat command description in the Commands Manual.

The signaling link cannot be removed, if the LSRESTRICT option is on and the number of signaling links assigned to the linkset will be less than the value of the tfatcabmlq parameter value of the linkset if the signaling link is removed.

If the LSRESTRICT option is on and the number of signaling links assigned to the linkset will be equal to or greater than the value of the tfatcabmlq parameter value of the linkset if the signaling link is removed, continue the procedure with 5.

If the LSRESTRICT option is on and the number of signaling links assigned to the linkset will be less than the value of the tfatcabmlq parameter value of the linkset if the signaling link is removed, the signaling link cannot be removed unless the tfatcabmlq parameter value of the linkset is changed to 0. Continue the procedure with 4..

If the LSRESTRICT value is off, continue the procedure with 5.
Change the tfatcabmlq parameter value of the linkset to 0 by entering the chg-ls command with the name of the linkset that contains the signaling link that is being removed and the tfatcabmlq parameters. For this example, enter this command.
chg-ls:lsn=ls17:tfatcabmlq=0

When this command has successfully completed, this message should appear.
```
rlghncxa03w 10-07-07 08:41:12 GMT  EAGLE5 42.0.0

Link set table is (20 of 1024) 2% full.

CHG-LS: MASP A - COMPLTD
```

Enter the rept-stat-lfs command to verify whether or not a link fault sectionalization test is being performed on the signaling link to be removed from the database. This is an example of the possible output.

rlghncxa03w 06-10-07 08:41:12 GMT  EAGLE5 36.0.0
SLK      LBP  PATTERN    MAX-ERRORS  BIT_ERRORS  MAX-TIME TEST-TIME
1201,A     5  B0247              56          30  01:00:00 00:00:50
1202,A     3  B511               56          27  01:00:00 00:01:05
1203,A     1  OCTET              56          12  01:00:00 00:02:07
1204,A     6  ALTERNATE          56          28  01:00:00 00:04:08
1205,A     2  B0247              56          36  01:00:00 00:03:05
1206,A     1  B0247              56          15  01:00:00 00:06:06
1207,A     3  B0247              56          19  01:00:00 00:02:04
1208,A     5  B0247              56          23  01:00:00 00:04:01
1208,B1    4  B0247              56          23  01:00:00 00:08:01

Note:

If the rept-stat-lfs command output in 5 shows that no LFS tests are being performed on the signaling link to be removed from the database, continue the procedure with 7.

Deactivate the LFS test being performed on the signaling link using the dact-lbp command, specifying the location signaling link being removed.

For this example, enter this command.

dact-lbp:loc=1212:link=a
When this command has successfully completed, this message should appear.
```
rlghncxa03w 06-10-07 08:41:12 GMT  EAGLE5 36.0.0
LOC = 1212  LINK = A

CLEAR STATUS = PASS, loop-back was cleared.
```
Deactivate the link to be removed using the dact-slk command, using the output from 1 to obtain the card location and signaling link information of the signaling link to be removed.
For this example, enter this command.

dact-slk:loc=1212:link=a

When this command has successfully completed, this message should appear.
```
rlghncxa03w 06-10-07 08:41:12 GMT  EAGLE5 36.0.0
Deactivate Link message sent to card
```

Verify that the link is out of service - maintenance disabled (OOS-MT-DSBLD) using the rept-stat-slk command with the card location and signaling link.

For this example, enter this command.

rept-stat-slk:loc=1212:link=a

This is an example of the possible output.

rlghncxa03w 06-10-23 13:06:25 GMT EAGLE5 36.0.0
SLK      LSN       CLLI        PST          SST       AST
1212,A   ls04      ls04clli    OOS-MT       Unavail   ----
  ALARM STATUS       = *   0235 REPT-LNK-MGTINH: local inhibited
  UNAVAIL REASON     = LI

If the signaling link to be removed is the last signaling link on a card, the card must be inhibited before the signaling link is removed. Before entering the dlt-slk command, enter the rmv-card command and specify the location of the card to be inhibited. The card location is shown in the output of rept-stat-slk command executed in 8 . If the signaling link to be removed is not the last signaling link on the card, continue the procedure with 10.

In the example used for this procedure, the signaling link is the last signaling link on the card and must be inhibited. Enter this command.

rmv-card:loc=1212
When this command has successfully completed, this message should appear.
```
rlghncxa03w 06-10-07 08:41:12 GMT  EAGLE5 36.0.0
Card has been inhibited.
```
Remove the signaling link from the EAGLE 5 ISS using the dlt-slk command. If there is only one signaling link in the linkset, the force=yes parameter must be specified to remove the signaling link.

In the example used in this procedure, the signaling link is the last signaling link in the linkset. Enter this command.

dlt-slk:loc=1212:link=a:force=yes
When this command has successfully completed, this message should appear.
```
rlghncxa03w 06-10-07 08:41:17 GMT  EAGLE5 36.0.0
DLT-SLK: MASP A - COMPLTD
```
Note:
If removing the signaling link will result in 700 or less signaling links in the database and the OAMHCMEAS value in the rtrv-measopts output is on, the scheduled UI measurement reports will be enabled.

Verify the changes using the rtrv-slk command. This is an example of the possible output.

rlghncxa03w 09-05-19 21:16:37 GMT EAGLE5 41.0.0

                                   L2T         L1               PCR  PCR
LOC  LINK LSN         SLC TYPE     SET  BPS    MODE TSET  ECM   N1   N2
1201 A    ls01         0  LIMDS0   1    56000  ---  ---   BASIC ---  -----
1201 B    lsa1         0  LIMDS0   1    56000  ---  ---   BASIC ---  -----
1202 B    ls02         0  LIMDS0   2    56000  ---  ---   BASIC ---  -----
1203 A    ls03         0  LIMDS0   3    56000  ---  ---   BASIC ---  -----
1203 B    lsa2         0  LIMDS0   1    56000  ---  ---   BASIC ---  -----
1204 B    ls01         1  LIMDS0   1    56000  ---  ---   BASIC ---  -----
1205 A    lsa3         0  LIMDS0   4    56000  ---  ---   BASIC ---  -----
1206 A    ls02         1  LIMDS0   2    56000  ---  ---   BASIC ---  -----
1207 A    lsn1207a     0  LIMDS0   1    56000  ---  ---   BASIC ---  -----
1207 B    lsn1207b     0  LIMDS0   1    56000  ---  ---   BASIC ---  -----
1208 B    ls03         1  LIMDS0   3    56000  ---  ---   BASIC ---  -----
1213 B    ls05         0  LIMDS0   5    56000  ---  ---   BASIC ---  -----
1214 A    lsn1214a     0  LIMDS0   2    56000  ---  ---   BASIC ---  -----
1214 B    lsa3         1  LIMDS0   4    56000  ---  ---   BASIC ---  -----
1215 A    ls05         1  LIMDS0   5    56000  ---  ---   BASIC ---  -----
1301 B    ls06         0  LIMDS0   6    56000  ---  ---   BASIC ---  -----
1304 B    ls06         1  LIMDS0   6    56000  ---  ---   BASIC ---  -----
1308 A    ls06         2  LIMDS0   6    56000  ---  ---   BASIC ---  -----
1311 A    ls01         2  LIMDS0   1    56000  ---  ---   BASIC ---  -----
1311 A1   ls05         2  LIMDS0   5    56000  ---  ---   BASIC ---  -----
1311 B    ls03         2  LIMDS0   3    56000  ---  ---   BASIC ---  -----
1311 B1   ls07         1  LIMDS0   7    56000  ---  ---   BASIC ---  -----
1313 A    ls07         0  LIMDS0   7    56000  ---  ---   BASIC ---  -----
1315 A    lsn5         0  LIMDS0   11   56000  ---  ---   BASIC ---  -----
1317 A    lsi7         0  LIMDS0   11   56000  ---  ---   BASIC ---  -----

                                   LP            ATM
LOC  LINK LSN         SLC TYPE     SET  BPS      TSEL      VCI    VPI   LL
1302 A    atmansi0     0  LIMATM   3    1544000  EXTERNAL  35     15    0
1305 A    atmansi1     0  LIMATM   4    1544000  INTERNAL  100    20    2
1318 A    atmansi0     1  LIMATM   9    1544000  LINE      150    25    4

                                   LP         ATM                    E1ATM
LOC  LINK LSN         SLC TYPE     SET BPS    TSEL     VCI   VPI  CRC4 SI SN
2101 A    atmitu1      0  LIME1ATM 5   2.048M LINE     150   2    ON   1  20
2105 A    atmitu1      1  LIME1ATM 5   2.048M LINE     35    15   ON   2  15

SLK table is (31 of 1200) 3% full

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 3-17 Removing an SS7 Signaling Link

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