ADC H2TU-C-231 Network Card User Manual


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Testing LTPH-UM-1109-01, Issue 1
44 January 9, 2002 H2TU-C-231 List 2
Table 16. Summary of HiGain HDSL2 Loopback Codes and Activation Methods
Method of Activation
Loopback Code Description Test Set Craft Port MODE/SEL
NLOC 1111000
4-in-7
DSX-1 signal is looped back to the network at the H2TU-C. X X X
NREM 1110000
3-in-7
DSX-1 signal is looped back to the network at the H2TU-R. X X X
CLOC 1111100
5-in-7
DS1 signal from the customer is looped back to the
customer at the H2TU-R.
X X X
CREM 1111110
6-in-7
DS1 signal from the customer is looped back to the
customer at the H2TU-C.
X X X
COLB 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.
X X
RULB 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.
X X
SMJK LpUp
(PL)
11000
2-in-5
SmartJack Loopup or NID payload (PL) code. Invokes
H2TU-R loopback towards network.
X
SMJK LpUp
(ESF-DL)
1111-1111-
0100-1000
SmartJack Loopup or NID (ESF-DL) code. Invokes
H2TU-R loopback towards network.
X
SMJK LpDn
(PL)
11100
3-in-5
SmartJack Loopdown or NID payload (PL) code. Removes
SMJK, NLOC, NREM, CLOC, and CREM.
X
SMJK LpDn
(ESF-DL)
1111-1111-
0010-0100
SmartJack Loopdown or NID (ESF-DL) code. Removes
SMJK, NLOC, NREM, CLOC, and CREM.
X
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 or the MODE and SEL pushbuttons.
Use the inband commands to enable or disable the SMJK loopback options.
The H2TU-C-231 List 2 system setting is normally enabled to recognize all inband SmartJack
loopback commands.
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