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LTPH-UM-1031-03, Issue 3
GNLB Test Procedures
Figure 29 on page 50
GNLB commands shown. Refer to
Loopback
Code
NLOC
1111000
4-in-7
NREM
1110000
3-in-7
NDU1
110000
2-in-6
CDU1
111100
4-in-6
NDU2
111000
3-in-6
CDU2
111110
5-in-6
D1LB
D2LB
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)
H4TU-C-319 List 1
is a graphical representation of the various loopback configurations with the associated
Table 16
for a description of these commands.
Table 16. Summary of HDSL4 Loopback and Activation Codes
Description
DSX-1 signal is looped back to the network at
the H4TU-C.
DSX-1 signal is looped back to the network at
the H4TU-R.
Signal is looped back to the network at H4D1.
DS1 signal from customer is looped back to the
customer at H4D1.
Signal is looped back to the network at H4D2.
DS1 signal from customer is looped back tot he
customer at H4D2.
Dual loopback at H4D1.
Dual loopback at H4D2.
DS1 signal from the customer is looped back to
the customer at the H4TU-R.
DS1 signal from the customer is looped back to
the customer at the H4TU-C.
Dual loopback at the H4TU-C. DSX-1 signal is
looped back to the network at the H4TU-C and
DS1 signal from the customer is looped back to
the customer at the H4TU-C.
Dual loopback at the H4TU-R. DSX-1 signal is
looped back to the network at the H4TU-R and
DS1 signal from the customer is looped back to
the customer at the H4TU-R.
SmartJack Loopup or NID payload (PL) code.
Invokes H4TU-R loopback towards network.
SmartJack Loopup or NID (ESF-DL) code.
Invokes H4TU-R loopback towards 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.
September 12, 2003
Method of Activation
Test Set
Craft Port
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Testing
MODE/SEL
X
X
X
X
X
X
X
X
X
X
X
X
51
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