System
Clocks/IPSI
Interchange
For high-reliability configurations, there are duplicate IPSIs on IPSI-controlled
port networks. For critical-reliability configurations, there are both duplicate
Tone-Clock circuit packs on non-IPSI controlled port networks and duplicate
IPSIs on IPSI-controlled port networks. When this option is turned on a system
clock or IPSI interchange is automatically initiated on each port network
possessing duplicated Tone-Clock circuit packs or IPSIs. Each port network
interchanges in the standby system clock or IPSI for 20 seconds. During this
time the newly-active circuit pack is tested and system health is monitored.
Then an interchange is made back to the originally-active circuit pack. This field
indicates the days that interchanges occur (daily, days of the week, or no). “No”
prevents interchanges. (no)
The information above was taken from the G3 Maintanence Book. If you look up the command "ch sys main" you will see a field that indicates if the tone clocks should interchange or not. As you can see if the clocks are set to auto interchange it's a temp. swap. This is normal. Use the "stat sys 1" command to check the health of the tone clocks. The SPE and tone clocks work independly of each other.
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shoreguy
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