Loopback Modes - ADC HiGain H2TU-C-231 Manual

LTPH-TP-1034-01, Issue 1
3 If step 2 fails, have the CO tester transmit the 3-in-5 in-band loopdown code.
4 Have the CO tester send the NLOC (4-in-7) in-band 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 ‡
1111000
4-in-7
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
* Set the NLBP option to AIS to send AIS (indicated by an all ones pattern) for any network loopback.
=
A3LB and A4LB loopback codes.
‡ A2LB loopback code.
GNLB loopback codes.
H2TU-C-231 List 4E
Loopbacks Toward Network
HDSL2 SPAN
HDSL2 SPAN
HDSL2 SPAN
=
HDSL2 SPAN
=
Loopbacks Toward Customer
HDSL2 SPAN
HDSL2 SPAN
Figure 28. Loopback Modes
September 28, 2001
TLOS*
HRU-412 HRU-412
LOGIC All ones
HRU-412
H2TU-R
SMJK*
1-in-6
1000000
HRU-412 HRU-412
HRU-412 All ones
2-in-5
11000
H2TU-R
=
FF02
NREM* NREM
C742 ‡
1110000 HRU-412 HRU-412 HRU-412 HRU-412 3-in-7
HRU-412 HRU-412 3 in 7 All ones
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
Testing
51