Generic Loopback Commands - ADC HIGAIN HDSL2 Manual

Testing
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) towards the network. In addition, these inband codes loop up CREM (6-in-7) or CLOC
(5-in-7) towards 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 system responds.
Figure 30 on page 49
generic loopback commands. See
using the GNLB mode.
Table 20. Summary of HiGain 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) loopback testing of the HiGain 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-231 List 1F system setting is normally enabled to recognize all inband SmartJack
loopback commands.
50
C
OMMANDS
summarizes the available loopbacks in the system, and
"GNLB Test Procedures" on page 53
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 DS1 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 DS1 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 towards network.
SmartJack Loopup or NID (ESF-DL) code. Invokes
H2TU-R loopback towards network.
SmartJack Loopdown or NID payload (PL) code. Removes
SMJK, NLOC, NREM, CLOC, CREM, CRGx, and NRGx.
SmartJack Loopdown or NID (ESF-DL) code. Removes
SMJK, NLOC, NREM, CLOC, CREM, CRGx, and NRGx.
October 2, 2000
152-231-116-01, Revision 01
Table 20 summarizes the HiGain
for the test procedures that apply when
Method of Activation
Test Set Craft Port
X X
X X
X X
X X
X
X
X
X
H2TU-C-231 List 1F
MODE/LBK
X
X
X
X
X
X