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150-409-115-05, Issue 5 Alarms
EDU-409 List 1 January 26, 2000 9
ALARMS
The front panel of the EDU-409 List 1 contains a tri-color LED. The LED
color and activity provides information on system functionality (see Table 4).
Table 4. Front Panel Status Indicator
LED Description
Flashing Green once
per second
Indicates synchronization is being attempted between the
EDU-409 List 1 and the upstream (network) module.
Flashing Green more
than once per second
Indicates synchronization is being attempted between the
EDU-409 List 1 and the downstream (customer) module.
Steady Green Indicates HDSL frame synchronization has been achieved
between the EDU-409 List 1 and both the upstream and
downstream modules.
Flashing Red once per
second
Indicates an HDSL Cyclic Redundancy Check (CRC) error has
occurred between the EDU-409 List 1 and the upstream module.
See "Technical Specifications" on page 21.
Flashing Red more
than once per second
Indicates an HDSL CRC error has occurred between the
EDU-409 List 1 and the downstream module. See "Technical
Specifications" on page 21.
Flashing Yellow once
per second
Indicates an NDU (Network Doubler Unit) loopback is in effect in
the EDU-409 List 1 towards the network. This tests the integrity of
the upstream span.
Flashing Yellow more
than once per second
Indicates a CDU (EDU-409 List 1 to customer) loopback is in
effect in the EDU-409 List 1 towards the customer. This tests the
integrity of the downstream span.