363-206-285
Circuit Pack Descriptions
Issue 3 June 2001
7-41
■ Protection switching for MXRVO/STS1E circuit pack protection
■ VT path overhead processing
■ Internal fault detection
■ Inventory information (
CLEI
code, date of manufacture, etc.)
■ Monitors a DS1 signal with SF or ESF frame format and generates PM
data.
Maintenance Signal Functions 7
The major maintenance signal functions are as follows:
■ Monitors DS1 signal for near-end and far-end performance
■ Detects VT path AIS
■ Inserts DS1 AIS toward fiber and toward DSX-1
■ Inserts and detects VT path yellow signal.
177A Retainer Card Description 7
Purpose of Card 7
To ensure proper operation of DS1/DS1PM circuit pack protection switching, the
177A Retainer card (Figure 7-15) must be installed in all unused slots within a
low-speed group that is partially equipped with DS1/DS1PM circuit packs.
!
CAUTION:
Unused low-speed interface slots within a partially equipped group must be
equipped with 177A Retainer cards if DS1 protection is used. Failure to do
so may result in corrupted transmission.
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