Loopback Operation - ADC HiGain H2TU-C-388 List 7F Manual

LTPH-UM-1214-02
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 (see
•
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-388 List 7F
52)
"Special Loopback Commands" on page
Figure
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 34. Loopback Summary
Table 24 on page
34):
NREM
SMJK
TLOS*
H2TU-R
Upstream
July 21, 2003
53) and the following
Table 23 on page 58)
59)
DS1
Activate loopback using
one of the following:
• LBK pushbutton
• Maintenance terminal
CLOC
• Test set
H0430-A
Customer
Premises
Testing
51