Testing; Loopback Operation; Generic Loopback Commands - ADC HiGain H2TU-C-202 User Manual

Testing

3 Type Y to clear all screens.
T
ESTING
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 (see
•
Special Loopback (SPLB) options (see
command tables:
–
Addressable Repeater Loopback commands: A1LB, A2LB, A5LB (see
– Addressable Repeater Loopback commands: A3LB, A4LB
The H2TU-C is configured for generic (GNLB) or special loopback modes (A1LB, A2LB, A3LB, A4LB, or
A5LB) by setting the loopback mode from the Config menu> PairGain Options.
Loopback commands can be initiated by:
•
Selecting the loopback command from the Monitor menu when connected to the craft port of the H2TU-C or
H2TU-R. (See "Using the Monitor Screen to View System Activity" on page
•
Entering the inband loopback command code into the test equipment connected to the H2TU-C or H2TU-R.
(See "A1LB, A2LB, and A5LB Test Procedures" on page 46
page 48.)
•
Pressing the loopback pushbutton on the front panel for at least 5 seconds to activate a dual loopback (NLOC
and CREM) at the H2TU-C.
Loopback timeouts are set with the Config screen Loopback Timeout option (see
Table 5 on page 14). Loopbacks can be terminated by issuing a loopdown command or by selecting LPDN from
the Monitor screen (see
G L
ENERIC OOPBACK
The HiGain 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 DS1 input from the CI.
40
"Special Loopback Commands" on page 43
Figure 12 on page 26).
C
OMMANDS
March 14, 2000
Table 18 on page
and the following
Table 19 on page
(Table 20 on page 48)
26.)
and "A3LB and A4LB Test Procedures" on
Figure 7 on page 13
152-202-116-02, Issue 2
42)
46)
and
H2TU-C-202 List 1F