Generic Loopback Commands - ADC H2TU-C-202 User Manual

LTPH-UM-1072-03
G L
ENERIC OOPBACK
The HiGain Generic Loopback (GNLB) commands allow you to use inband codes to loop up either NLOC
(4-in-7) or NREM (3-in-7) toward the network. In addition, these inband codes loop up CREM (6-in-7) or CLOC
(5-in-7) toward the customer. Either loopup condition can be terminated (looped down) with the 3-in-5, SMJK
loopdown code. All inband codes must be present for at least 5 seconds before the HiGain HDSL2 system
responds. TLOS is a logic loopback caused by loss of the DS1 input from the CI.
Figure 33 on page 57
the HiGain HDSL2 generic loopback commands. See
that apply when using the GNLB mode.
Table 22. Summary of HiGain HDSL2 Loopback Codes and Activation Methods
Loopback Code
NLOC 1111000
4-in-7
NREM 1110000
3-in-7
CLOC 1111100
5-in-7
CREM 1111110
6-in-7
COLB
RULB
SMJK LpUp 11000
(PL) 2-in-5
SMJK LpUp 1111-1111-
0100-1000
(ESF-DL)
SMJK LpDn 11100
(PL) 3-in-5
SMJK LpDn 1111-1111-
0010-0100
(ESF-DL)
HiGain systems feature the SmartJack option which can emulate a Network Interface Device
(NID) for loopback testing of the HiGain HDSL2 circuit. SMJK and NREM loopbacks perform the
same functions, but their initiation differs. SMJK indicates that the loopback was initiated by the
2-in-5 inband command. NREM, on the other hand, is initiated by the 3-in-7 inband command, or
by a command issued from the maintenance terminal.
Use the inband commands to enable or disable the SMJK loopback options. The H2TU-C-202
system setting is normally enabled to recognize all inband SmartJack loopback commands.
H2TU-C-202 List 2F
C
OMMANDS
summarizes the available loopbacks in the system, and
Description
DSX-1 signal is looped back to the network at the H2TU-C.
DSX-1 signal is looped back to the network at the H2TU-R.
DS1 signal from the customer is looped back to the
customer at the H2TU-R.
DS1 signal from the customer is looped back to the
customer at the H2TU-C.
Dual loopback at the H2TU-C. DSX-1 signal is looped back
to the network at the H2TU-C and signal from the customer
is looped back to the customer at the H2TU-C.
Dual loopback at the H2TU-R. DSX-1 signal is looped back
to the network at the H2TU-R and signal from the customer
is looped back to the customer at the H2TU-R.
SmartJack Loopup or NID payload (PL) code. Invokes
H2TU-R loopback toward network.
SmartJack Loopup or NID (ESF-DL) code. Invokes
H2TU-R loopback toward network.
SmartJack Loopdown or NID payload (PL) code. Removes
SMJK, NLOC, NREM, CLOC, and CREM.
SmartJack Loopdown or NID (ESF-DL) code. Removes
SMJK, NLOC, NREM, CLOC, and CREM.
October 25, 2002
Table 22
"GNLB Test Procedures" on page 56
Test Set
X
X
X
X
X
X
X
X
Testing
on this page summarizes
for the test procedures
Method of Activation
Craft Port MODE/LBK
X X
X X
X X
X X
X X
X X
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