Loopback Operation; Addressable Repeater Loopback Commands: A1Lb, A2Lb, A5Lb - ADC HiGain H2TU-C-231 List 3F User Manual

LTPH-UM-1149-01
L O
OOPBACK PERATION
HiGain HDSL2 has a family of loopback options for analyzing circuit functionality. The loopback signal is
transmitted and returned to the sending device for comparison. This allows you to verify the integrity of the
HDSL2 channels to the H2TU-C, the H2TU-C DSX-1 interface and the DS1 channels to the customer. Loopback
options include:
• Generic Loopback (GNLB) options, including the SmartJack (SMJK) option and double loopbacks (see
Table 22 on page
•
Special Loopback (SPLB) options (see
command tables:
–
Addressable Repeater Loopback commands: A1LB, A2LB, A5LB (see
–
Addressable Repeater Loopback commands: A3LB, A4LB (see
Loopback commands can be initiated by:
•
Selecting the loopback type using the MODE and LBK pushbuttons on the H2TU-C front panel or the manual
loopback (LBK) pushbutton on the H2TU-R
•
Selecting the loopback type from the Monitor menu when connected to the craft port of the H2TU-C or H2TU-R
•
Entering the loopback code (except for COLB and RULB) into the test equipment connected to the H2TU-C
or H2TU-R.
HiGain supports multiple loopbacks, but a single loopback is the preferred method.
Activate loopback using
one of the following:
• MODE/LBK
pushbuttons
• Maintenance terminal
• Test set
Network
H2TU-C-231 List 3F
52)
"Special Loopback Commands" on page
DSX-1
NLOC CREM
H2TU-C
Downstream
* When enabled, TLOS is an automatic loopback
that occurs with an LOS at the remote DS1 input.
Figure 31. Loopback Summary
June 12, 2002
53) and the following
Table 23 on page
Table 24 on page
DS1
Activate loopback using
one of the following:
• LBK pushbutton
NREM
• Maintenance terminal
SMJK CLOC
• Test set
TLOS*
H2TU-R
Upstream
Customer
Premises
Testing
58)
59)
51