Oct55 Test Pattern With Ami Line Code; Loopback Operation - ADC HiGain H2TU-C-202 User Manual

Testing
OCT55 T P
EST
The OCT55 test pattern can be used in unframed mode to stress the system and verify data integrity. In an SF or
ESF framing mode, excessive zero anomalies may occur, which causes the H2TU-C to report ES, SES, and UAS
errors according to ANSI T1.231-1997.
L O
OOPBACK PERATION
HiGain HDSL2 has a variety 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 commands can be initiated by (refer to
• Entering the loopback code into the test equipment connected to the H2TU-C or H2TU-R.
• Selecting the loopback type from the Monitor menu when connected to the H2TU-C or H2TU-R (see
"Loopback Testing Using a Maintenance Terminal" on page
• Using the loopback pushbuttons (LLB and RLB) on the H2TU-R (see
Front-Panel Pushbuttons" on page
•
Special loopback modes:
–
Generic Mode Loopback (GNLB) commands, including the SmartJack (SMJK) option (see
Mode Loopback Commands" on page
–
A3LB Mode Addressable Repeater Loopback commands (see
page 43).
HiGain supports multiple loopbacks, but a single loopback is the preferred method.
Activate loopback using
one of the following:
• Maintenance terminal
• Test set
Network
42
AMI L
ATTERN WITH
47).
43).
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 28. Loopback Summary
C
INE ODE
Figure 28):
47).
"Loopback Testing Using Remote Unit
"A3LB Mode Loopback Commands" on
NREM
SMJK CLOC
TLOS*
H2TU-R
Upstream
June 6, 2003
LTPH-UM-1208-01
"GNLB
DS1
Activate loopback using
one of the following:
• Loopback pushbuttons
• Maintenance terminal
• Test set
H0031-A
Customer
Premises
H2TU-C-202 List 7G