IPSV-CTL (Ipserver Interface Control)
Issue 1 May 2002
8-951555-233-143
■ Active IPSI has a faulty Archangel.
1. PKT-INT detects dead EAL and reports it to software.
2. Software interchanges PKT-INT.
3. Software interchanges Archangel.
4. Software interchanges Tone-Clock.
■ Both IPSIs are healthy (planned interchange sequence).
1. Software interchanges Tone-Clock.
2. Software interchanges PKT-INT.
3. Software interchanges Archangel.
If both of an PN’s IPSIs have faulty Tone-Clock, then the PN is out of service.
If both of an PN’s IPSIs have faulty components (but at least one has a good
Tone-Clock circuit), then the PN “falls back” to EI-EAL mode of operation, where:
■ The PN’s EI provides Archangel functionality
■ Another PN’s IPSI provides PKT-INT functionality
For details, see ‘‘EXP-INTF (Expansion Interface Circuit Pack)’’ on page 8-762.
The following tables show the only valid combinations of IPSIs and EIs providing
Tone-Clock, PKT-INT, and Archangel functions. Any combination not shown here
is invalid.
Table 8-370. IPSI A is Active
Function IPSI A IPSI B EI
IPSI in
Another PN
Tone-Clock X
PKT-INT X
Archangel X
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