Loopback Modes - ADC HiGain H2TU-C-231 User Manual

Testing
4 Have the CO tester send the NLOC (4-in-7) inband loopup for 5 seconds. You should be able to observe the
NLOC message on the front-panel display. (The Status LED on the front panel should be yellow, and the
loopback mode should also be identified on the Monitor screen.)
5 Repeat Step 2. If the test passes, the problem is in the downstream direction. If it fails, the problem is in the
upstream direction.
H2TU-C HLU HLU HLU
H2TU-C HLU HLU HLU
H2TU-C
HLU HLU HLU
FF1E
NLOC D3D3 ‡
4-in-7 1111000
HLU HLU HLU
H2TU-C
3F1E
CREM
D3D3 ‡
1111110
6-in-7
All ones HLU HLU HLU
H2TU-C
HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU HLU
All ones H2TU-C
H2TU-C
HLU HLU HLU
COLB
* Set the NLBP option to AIS to send AIS (indicated by an all ones pattern) for any network loopback.
=
A3LB and A4LB loopback codes.
‡ A1LB, A2LB, and A5LB loopback codes.
GNLB loopback codes.
48
Loopbacks Toward Network
HDSL2 SPAN
HDSL2 SPAN
HDSL2 SPAN
=
HDSL2 SPAN
=
Loopbacks Toward Customer
HDSL2 SPAN
HDSL2 SPAN
Figure 28. Loopback Modes
January 9, 2002
LTPH-UM-1109-01, Issue 1
TLOS*
HRU-412 HRU-412
LOGIC HRU-412 All ones
H2TU-R
SMJK*
HRU-412 HRU-412
2-in-5 All ones
11000 HRU-412
H2TU-R
=
FF02
NREM NREM*
C742 ‡
1110000 3-in-7
HRU-412 HRU-412 HRU-412 HRU-412
3 in 7 All ones
HRU-412 HRU-412
HRU-412 H2TU-R
CLOC
HRU-412 HRU-412
H2TU-R
5 IN 7
All ones
HRU-412
H2TU-R
=
3F02
CLOC CLOC CLOC CLOC
C742 ‡
1111100 5-in-7
HRU-412 HRU-412 HRU-412 HRU-412
5 IN 7 5 IN 7 5 IN 7
HRU-412 HRU-412 HRU-412 H2TU-R
H2TU-R
RULB
H2TU-C-231 List 2