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

152-202-115-04, Revision 04

Generic Loopback Commands

The HiGain HDSL2 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 loop-down code. All inband codes must be present for at least 5 seconds before the HiGain HDSL2 system
responds. HiGain HDSL2 also supports NRGx regenerator loopbacks to the network and CRGx regenerator
loopbacks towards the customer. TLOS is a logic loopback caused by loss of the T1 input from the CI.
Figure 26 on page 43 summarizes the available loopbacks in the system, and
HiGain HDSL2 generic loopback commands. See
that apply when using the GNLB mode.
H2TU-C-202 List 1E
"GNLB Test Procedures" on page 47
Figure 26. Loopback Summary
April 21, 2000
Table 21 on page 44 summarizes the
for the test procedures
Testing
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