ADC HDSL4 用户手册
LTPH-UM-1031-03, Issue 3
Installation
H4TU-C-319 List 1
September 12, 2003
9
V
ERIFICATION
Once the H4TU-C is installed, verify that it is operating properly. To do this, monitor the following:
•
Status LED
•
Status messages reported by the front-panel display (see
Verification without a Downstream Device
If there is no downstream device installed:
1
Verify that the H4TU-C powers up. The front-panel display illuminates and reports status messages. (See
for a list of messages.)
2
Verify that the H4TU-C attempts to communicate with downstream devices (status LED flashes red). Even
if a downstream device is not present, the following events should occur:
if a downstream device is not present, the following events should occur:
a
The front-panel display reports various four-character status messages.
b
The H4TU-C again attempts communication until a downstream device is detected.
Verification with a Downstream Device
If a downstream device has been installed:
1
Verify that the H4TU-C powers up. (The front-panel display illuminates and reports various status messages.)
2
Verify that the H4TU-C attempts to communicate with downstream devices (status LED flashes red). One of
the following occurs:
the following occurs:
•
If downstream devices are successfully identified and the HDSL4 loop synchronizes, the H4TU-C status
LED lights steady green. The H4TU-C reports normal margin and loop attenuation messages on the
front-panel display.
LED lights steady green. The H4TU-C reports normal margin and loop attenuation messages on the
front-panel display.
•
If downstream devices are not successfully identified, the H4TU-C reports four-character status
messages. The H4TU-C attempts communication again and reports four-character status messages. The
H4TU-C repeats this cycle until a downstream device is detected.
messages. The H4TU-C attempts communication again and reports four-character status messages. The
H4TU-C repeats this cycle until a downstream device is detected.
3
If there is more than one span, verify that each subsequent span synchronizes normally by monitoring the
front-panel display messages.
front-panel display messages.
4
If a remote unit is installed, verify that the last span synchronizes normally. The H4TU-C status LED should
light a steady green and the front-panel display should report normal margin messages.
light a steady green and the front-panel display should report normal margin messages.
5
Verify that a valid DS1 signal has been applied to the H4TU-C and the H4TU-R.
•
If no DS1 signal is being applied to either the H4TU-C or the H4TU-R inputs, then the appropriate DS1
alarms (LLOS or RLOS) display on the front panel and the status LED flashes red.
alarms (LLOS or RLOS) display on the front panel and the status LED flashes red.
•
If a valid DS1 signal is being supplied to the H4TU-C and H4TU-R, then DS1 alarm indications should
be absent and the status LED should be steady green.
be absent and the status LED should be steady green.