change system-parameters maintenance
Issue 4 May 2002
A-21 555-233-123
System Clocks
Interchange
For High and Critical Reliability systems, this option initiates a Tone-Clock
interchange in each port network possessing duplicated Tone-Clock circuit
packs. Each port network interchanges into the standby Tone-Clock for 20
seconds and then back to the originally-active Tone-Clock. This field indicates
the days that interchanges occur. (daily, days of the week, or no). “No” prevents
interchanges. (no)
The system performs a Tone-Clock interchange, activating the stand by
Tone-Clock. After the newly-active Tone-Clock circuit pack is tested, it
provides system clocks for its native port network. Then the system
interchanges to the originally active Tone-Clock circuit pack.
SPE
Interchange
This field indicates the days SPE interchanges execute during scheduled
maintenance, for duplicated SPE systems. (daily, days of the week, or no). No
prevents scheduled interchanges. (no)
EXP-LINK
Interchange
This field indicates if expansion links between port-networks
interchange as part of scheduled maintenance. The value daily means
that EXP-LINK interchanges automatically occur everyday. The value
no means that EXP-LINK interchanges do not automatically occur as
part of scheduled maintenance. Values represented by the days of the
week mean that EXP-LINK interchanges automatically occur
automatically on specified days. Since EXP-LINK interchanges apply to
duplicated systems, simplex systems do not display this field. (no)
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