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LTPH-UM-1031-03, Issue 3 Installation
H4TU-C-319 List 1 September 12, 2003 9
VERIFICATION
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 Table 2 on page 5)
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
Table 2 on page 5 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:
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:
• 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.
• 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.
3 If there is more than one span, verify that each subsequent span synchronizes normally by monitoring the
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.
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.
• 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.