Protection switching
....................................................................................................................................................................................................................................
Overview
Metropolis
®
DMXplore provides different types of protection
switching, described in the subsequent sections of this chapter:
•
“Unidirectional path-switched ring switching” (4-13)
•
“1+1 line protection switching” (4-16)
•
“Synchronization reference protection switching” (4-19)
Metropolis
®
DMXplore also supports 1+1 equipment protection
switching. Main circuit pack protection switching is executable from
the WaveStar
®
CIT System View menu by selecting
Fault
→
Timing/Sync Protection Switch
→
Main Circuit Pack Timing
Switch
.
Application modes
There are three types of protection modes applicable to the optical
interfaces (line pairs) as shown below:
•
UPSR: The UPSR application mode provides unidirectional
STS-N/VT1.5 ring path protection switching on high-speed OC-N
interfaces. This option is user-provisionable on a per-port basis
and supports single- and dual-homed ring-on-ring topologies.
•
1+1: The 1+1 application mode provides SONET 1+1 protection
for high-speed OC-N line pairs. This option is user-provisionable
on a per-port basis.
From the WaveStar
®
CIT System View menu, select
Configuration
→
Equipment
to set the protection modes.
Provisioning protection
switching
From the WaveStar
®
CIT System View menu, select
Fault
→
Protection Switch
to execute a protection switch.
A popup window then appears offering a choice of the protected
devices on the shelf. The type of protection switching provisioned for
each device is shown next to the device location.
Double-clicking on one of the protection groups calls up the elements
of the group or a second popup display offering a choice of
user-defined protection switch modes.
The choices are as follows:
•
1+1 Line Protection (Port): Lockout, Manual, Forced, or Reset.
•
Path Protection: Manual, Forced, Lockout, or Reset.
Maintenance overview
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365-372-333 R2.1
Issue 4, June 2005
Lucent Technologies
4 - 1 1
