Synchronization reference protection switching
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Overview
Metropolis
®
DMXplore provides protection for all system
synchronization references. Synchronization reference protection
switching occurs in response to automatically detected faults and
external commands from an WaveStar
®
CIT or operations system
(OS).
Protection switching
priorities
The following table shows the synchronization reference protection
switch priorities (in descending order of priority) used by Metropolis
®
DMXplore.
Table 4-5
Synchronization reference protection switch
priorities
Switch Types
Source of Request
Clear Reference Switch
(Reset)
WaveStar
®
CIT or OS
(
opr-syncnsw
)
Reference Failure
Automatic
Manual Switch
WaveStar
®
CIT or OS
(
opr-syncnsw
)
Operation
In the line timing mode, synchronization reference protection
switching may be provisioned the following:
•
Revertive-1: When provisioned Revertive-1, main-1-1 is
designated the primary reference.
•
Revertive-2: When provisioned Revertive-2, main-2-1 is
designated the primary reference.
•
Nonrevertive (default): When a reference is selected, it will
remain active even after the other reference recovers from the
degradation that caused the protection switch, unless line timing
and Sync Autoreconfiguration (auto) is enabled and the other
reference has changed to a higher quality.
If neither reference is available, the system automatically switches to
holdover timing mode.
When Metropolis
®
DMXplore is provisioned for synchronization
messaging, the system can determine the quality of the line timing
Maintenance overview
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365-372-333 R2.1
Issue 4, June 2005
Lucent Technologies
4 - 1 9