Loopback Testing Using A Maintenance Terminal; Loopback Testing Using Remote Unit Front-Panel Pushbuttons; Programmable Dsx-1 Test Jacks - ADC HiGain H4TU-C-388 List 5A User Manual

Testing
5 Once the test is complete, do one of the following:
•
If the system is to loopdown but remain armed, send the IR (Intelligent Repeater) LPDN code (universal
loopdown).
•
If all the equipment is to be looped down, disarmed and returned to normal operation, send the disarm
inband code 11100 or the ESF-DL code (FF24).
The Armed mode has an automatic time-out of 120 minutes, but this timer is reset to 120 for any
of the following events:
• Loopback terminates (manually or time-out)
• Query
• Alternate query
• Far End activate
• Another ARM command
This timer is inhibited while any of the valid command codes are being sent. Once the codes
are removed, the timer restarts at 120.

Loopback Testing Using a Maintenance Terminal

To activate a loopback session using a maintenance terminal:
1 Press ESC to clear the Config menu, then press
2 Press the SPACEBAR
loopback, then press
3 To manually terminate the loopback, press the
confirm.

Loopback Testing Using Remote Unit Front-Panel Pushbuttons

On the H4TU-R front panel, press the appropriate pushbutton for 5 or more seconds:
•
LLB - to activate a dual loopback at the H4TU-R (NREM + CLOC).
•
RLB - to activate a dual loopback at the H4TU-C (NLOC + CREM).
To loopdown any active loopback in the system, including SMJK and TLOS, press
the LLB or RLB pushbutton for 5 or more seconds. To activate a dual loopback after a
loopdown, again press the LLB or RLB pushbutton for 5 or more seconds.

Programmable DSX-1 Test Jacks

The H4TU-C front panel DSX-1 LINE jacks can be configured for intrusive test access of the signal to/from the
network or to/from the customer (default setting). The front panel DSX-1 MON jacks always provide
non-intrusive monitoring of the DSX-1 signal to and from the customer.
Use of the programmable DSX-1 LINE jacks will interrupt normal traffic flow.
When performing intrusive testing to the customer, configure the DS1 Test Jack direction for "CPE." Connect the
DS1 Test Equipment to the DSX-1 LINE jacks as shown in
disconnected and no DS1 signal is transmitted to the network.
When peforming intrusive testing to the network, configure the DS1 Test Jack direction for "NET." Connect the
DS1 Test Equipment to the DSX-1 LINE jacks as shown in
H4TU-C and an AIS or LOS is sent to the customer.
50
to select the NLOC, CREM, NDU1, CDU1, NDU2, CDU2, NREM, or CLOC
ENTER
to activate the loopback. Press
SPACEBAR
October 15, 2003
M to select the Monitor screen.
Y
to confirm.
to select LPDN, then press
Figure 29 on page 51. The signal from the network is
Figure 30 on page 51. An LLOS is reported at the
LTPH-UM-1252-01
ENTER Y
. Press to
H4TU-C-388 List 5AA