the switch priority is provisioned as Forced. When Forced (default) is
selected, a forced switch is not preempted by a failure of the
protection line in 1+1 applications.
Table 4-3
Protection switching priorities (1+1 switch priority
= forced)
Switch Priorities
(Descending Order)
Source of Request
Reset
WaveStar
®
CIT or OS (clears any
user-initiated switch request)
Lockout of Protection
WaveStar
®
CIT or OS prevents any
switch request (automatic or
user-initiated)
Forced Switch
WaveStar
®
CIT or OS
Signal Failure
Automatic
Signal Degrade
Automatic
Manual Switch
WaveStar
®
CIT or OS
The following table lists the 1+1 line protection switch priorities (in
descending order of priority) used by Metropolis
®
DMXplore when
the switch priority is provisioned as Signal Failure. When Signal
Failure is selected, a signal failure on the protection side preempts a
forced switch in 1+1 applications.
Table 4-4
Protection switching priorities (1+1 switch priority
= signal failure)
Switch Priorities
(Descending Order)
Source of Request
Reset
WaveStar
®
CIT or OS (clears any
user-initiated switch request)
Lockout of Protection
WaveStar
®
CIT or OS prevents any
switch request (automatic or
user-initiated)
Signal Failure
(Protection)
Automatic
Forced Switch
WaveStar
®
CIT or OS
Signal Failure (Working)
Automatic
1+1 line protection switching
Maintenance overview
....................................................................................................................................................................................................................................
365-372-333 R2.1
Issue 4, June 2005
Lucent Technologies
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