363-206-305
Circuit Pack Descriptions
Issue 3 June 2000
7-29
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 7-12) 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.
Figure 7-12. 177A Retainer Card
x
x
S1:1
x
x
x
177A
RTNR
tpa 789738/01
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