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SS7 Redundancy: Disabling, Reconfiguring and Querying
Overview
This procedure describes how to disable, reconfigure and query SS7 redundancy. If you need to alter redundancy on a live system, follow the procedure, In-Service Upgrades.
Before you begin
Before you disable SS7 redundancy using the CCS Redundancy Configure message, you must be prepared to allow both SS7 cards to reset and for all call processing to stop.
Redundancy can be disabled either automatically by the CSP or by the host with the CCS Redundancy Configure message. When redundancy is disabled, one of the following values is sent to the host in the CCS Redundancy Report message:
0x20 |
Primary card is out of service |
0x21 |
Secondary card is out of service |
0x22 |
Redundant I/O card is removed |
0x24 |
Redundancy disabled by the host |
0x25 |
Primary card reset during synchronization |
0x26 |
Secondary card reset during synchronization |
0x27 |
Primary card detected link failure to mate during synchronization state (1 or 2) |
0x28 |
Secondary card detected link failure to mate during synchronization state (1 or 2) |
0x29 |
Primary card detected link failure to mate while in stable state (3 or 4) |
0x30 |
Secondary card detected link failure to mate while in stable state (3 or 4) |
Redundancy is automatically disabled by the CSP under the following conditions:
• Either SS7 card is removed or taken out of service.
• The I/O card is removed.
• A Matrix Controller switchover occurs while the SS7 cards are synchronizing.
See SS7 Card Switchover.
Host Disabling of Redundancy
You can disable the redundancy configuration from the host by sending the CCS Redundancy Configure message and setting the Secondary Slot field to 0xFF. Both SS7 cards reset and come back in service as independent cards with the default configuration. You must resend non-default SS7 configuration to both cards.
To disable redundancy without resetting both SS7 cards, remove one of the cards or take it out of service with the Service State Configure message.
Disabling redundancy with the CCS Redundancy Configure message resets both SS7 cards and stops all SS7 call processing.
To activate redundancy after replacing an SS7 card, send the CCS Redundancy Configure message using the same primary and secondary assignments for the SS7 cards as when redundancy was originally configured.
You must reconfigure signaling links and PPL configuration (PPL Assign, PPL Configure, and PPL Timer Configure messages) for link-related components. Link components are documented in the Chapter 7, SS7 PPL Information of this developer’s guide.
You can query the redundancy information by sending the CCS Redundancy Query message. The CSP returns the state of the redundant pair and identifies the slots of the Primary, Secondary, and Active cards.
The following values are reported to the host in the CCS Redundancy Query message to indicate the redundancy status:
0x01 |
Primary Active, Secondary Synchronizing |
0x02 |
Secondary Active, Primary Synchronizing |
0x03 |
Both Cards Active (Primary) |
0x04 |
Both Cards Active (Primary) |
0x05 |
Redundancy is being disabled |
Making a Non-redundant System Redundant
To make a non-redundant system redundant, perform the following steps:
Step |
Action |
---|---|
1 |
Install a second SS7 card or an SS7 card and I/O card pair as shown in the CSP Hardware Installation and Maintenance Guide. |
2 |
Wait for system to send the Card Status Report message for each inserted card. |
3 |
Configure SS7 redundancy. |
4 |
Wait for synchronization to complete (Redundancy Status field value of 0x03 or 0x04 in the CCS Redundancy Report message). |
To replace an SS7 card, perform the following steps:
Step |
Action |
---|---|
1 |
Press the STOP button on the SS7 card. |
2 |
Remove the appropriate SS7 card and replace it with a functional SS7 card. |
3 |
Wait for system to send the Card Status Report message for the inserted card. |
4 |
Configure SS7 redundancy. Configuring SS7 Card Redundancy |
5 |
Wait for synchronization to complete (Redundancy Status field value of 0x03 or 0x04 in the CCS Redundancy Report message). |
To replace an I/O card, perform the following steps:
Step |
Action |
---|---|
1 |
Press the STOP button of the SS7 card in front of the I/O cards. |
2 |
Remove the appropriate I/O card and replace it with a functional I/O card. |
3 |
Wait for system to send two Card Status Report messages, one for each of the I/O cards. |
4 |
Configure SS7 redundancy. |
5 |
Wait for synchronization to complete (Redundancy Status field value of 0x03 or 0x04 in the CCS Redundancy Report message). |