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.

Disabling Redundancy

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:

Redundancy Disabled Values

CSP Disabling of Redundancy

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.

Reconfiguring Redundancy

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.

Querying Redundancy

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:

Synchronization States

Stable States

Redundancy Disabled

In-Service Upgrades

Making a Non-redundant System Redundant

To make a non-redundant system redundant, perform the following steps:

Replacing an SS7 Card

To replace an SS7 card, perform the following steps:

Replacing an I/O Card

To replace an I/O card, perform the following steps: