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Loopback C Codirectional DCM circuits
Loopback C for the Codirectional DCM is a bidirectional loopback that loops back
at the DX (see Figure 27-14).
Procedure 27-5 To set a DCM circuit loopback
where pp is 1 or 9, and c is 1 or 2
27.5
Primary rate circuit loopbacks
The 2902 MainStreet system supports two types of primary rate circuit
loopbacks—Loopback A and Loopback C. Both types can be performed on a LIM at
the same time.
2902 MainStreet Technical Practices
May 2002
90-2906-01
Figure 27-14 Loopback C for the Codirectional DCM
Data
interface
ON_CIRCUIT
<pp-c> ↵
LOOPBACK_B
2902 MainStreet
Codirectional
Control
DCM
card
Line
DX
interface
DX
Loopback C
MAINT
UNDO_MAINT
LOOPBACK_C
UNDO_LPK
27 — Loopbacks
8858
SK000543
27-13
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