Clear-Com HX System Frames - Manual (Page 123)

• Two IVC-32 Cards and one IVC-32 Redundant Card - you can either set the
redundant card to provide redundancy backup for both IVC-32 Cards in event of
failure, or specify that it is only backing up a particular card.
• Two IVC-32 Cards and two IVCF-32 Redundant Cards - you must specify which
redundant card is providing redundancy for which IVC-32 card. It is not possible to
have two redundant cards providing backup for the same IVC-32 Card.
• Three IVC-32 Cards and one redundant card - you can either set the redundant
card to provide redundancy backup for both IVC-32 Cards in event of failure, or
specify that it is only backing up a particular card.
An IVC-32 Card will fail-over to the IVC-32 Redundant Card under the following conditions:
• All configured VoIP ports are unconnected for longer than 90 seconds.
• The IVC-32 Card is detected as absent from the VME backplane.
• It is requested via the EHX Event Log.
When a failover is detected, the following steps occur:
1) The Config card checks to see if there is a redundant card configured to take over
from the failed card. If not then the card is placed into an error state and nothing
else happens.
2) If a redundant card is configured then the failed card is placed into an error state.
3) All port numbers and timeslots are turned over to the redundant card.
4) The failed card has its IP details cleared. The IP address is changed to
169.254.0.
and resets.
5) The redundant card takes on the failed card’s pervious IP address and resets.
6) On start-up the redundant card is placed into the Initialising state and finally into
the Running States.
7) The failed card stays in the Error state.
8) The redundant card now establishes all VoIP calls that were previously configured
on the failed card.
Once the switch over process has started the redundant card starts accepting and making
VoIP connections within 40 seconds.
5.41.1 Switch-back
A switch back from a redundant card back to a failed card only occurs under the following
condition:
1) The redundant card has failed. If the original card is still in error, then it will switch
back and forward until corrective action is taken.
123 Eclipse EHX Software User Guide