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Testing LTPH-UM-1031-03, Issue 3
50 September 12, 2003 H4TU-C-319 List 1
Figure 29. Loopback Modes
All ones
All ones
All ones
SPAN 4 SPAN 3
SPAN 1
CDU1
4 in 6
111100
HDU-409
NDU2
SPAN 2
CDU1
4 in 6
111100
HDU-409
NDU1
H4D1
H4D2
All ones
All ones
HDSL4 SPAN
HLUHLUHLU
C742 ‡
All ones
HDSL4 SPAN
D3D3 ‡
HLUHLUHLU
CREM
HRU-412
5 IN 7
CLOC
HRU-412
HDSL4 SPAN
HLUHLUHLU
HRU-412
HRU-412
5 IN 7
CLOC
HRU-412
HRU-412
5 IN 7
CLOC
HRU-412
HRU-412
5 IN 7
CLOC
HRU-412
HRU-412
CLOC
All ones
HLUHLUHLUHLUHLUHLUHLUHLUHLUHLUHLUHLUHLUHLUHLU
D3D3 ‡
NLOC
HRU-412
HDSL4 SPAN
HLUHLUHLU
HRU-412
HRU-412
3 in 7
NREM
HRU-412
HRU-412
HRU-412
HRU-412
HDSL4 SPAN
HDSL4 SPAN
HLU
HLU
HLU
HLU
HLU
HLU
HRU-412
HRU-412
HRU-412
HRU-412
HRU-412
HRU-412
C742 ‡
11000
2-in-5
H4TU-C
H4TU-C
NREM*
SMJK*
TLOS*
LOGIC
LoopbacksToward Customer
CI-Customer Interface
DSX-1
LoopbacksToward Network
* Set the NLBP option to AIS to send AIS (indicated by an all ones pattern) for any network loopback.
SPAN 1 SPAN 2
CDU1
SPAN 3
H4D1
CDU2
H4D2
H4TU-R
H4TU-R
H4TU-R
H4TU-R
H4TU-R
H4TU-R
H4TU-R
All ones
H4TU-C
H4TU-C
H4TU-C
H4TU-C
H4TU-C
H4TU-R
H4TU-C
C741 ‡
C741 ‡
C754 ‡
C754 ‡
FF04 FF06
2-in-6
110000
3-in-6
111000
FF02
1110000 3-in-7
FF1E
1111000
3F04 3F06
3F1E
6-in-7
1111110
3F02
1111100
4-in-6
111100
5-in-6
111110
5-in-7
=
=
=
=
=
=
=
=
=
A3LB loopback codes.
‡ A5LB loopback codes.
4-in-7
GNLB loopback codes.
HLUHLUHLU
H4D1
D1LB
H4D2
D2LB
H4TU-C
H4TU-R
Bidirectional (Dual) Loopbacks
COLB
RULB