Loopback Operation; Addressable Repeater Loopback Commands: A2Lb - ADC HiGain H2TU-C-388 Technical Practice

LTPH-TP-1001-02, Issue 2
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) commands (see
• Special Loopback (SPLB) commands (see
command tables:
–
Addressable Repeater Loopback commands: A2LB (see
–
Addressable Repeater Loopback commands: A3LB, A4LB (see
•
SmartJack (SMJK) Loopback commands (see
Loopback commands can be initiated by:
•
Selecting the loopback type using the MODE and SEL buttons 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 into the test equipment connected to the H2TU-C or H2TU-R
Activate loopback using
one of the following:
• MODE/SEL pushbuttons
• Maintenance Terminal
• Test set
HiGain supports multiple loopbacks, but a single loopback is the preferred method.
H2TU-C-388 List 3E
Table 22 on page
"Special Loopback Commands" on page
NLOC CREM
H2TU-C
Network
Figure 28. Loopback Summary
February 28, 2001
50)
Table 23 on page
Table 24 on page
Table 25 on page 56)
NREM
SMJK CLOC
TLOS
H2TU-R
Customer
Premises
50) and the following
54)
56)
Activate loopback using
one of the following:
• LBK pushbutton
• Maintenance Terminal
• Test Set
Testing
49