Alarms, Front panel status indicator, Larms – ADC EDU-409 User Manual
Page 15
150-409-115-05, Issue 5
Alarms
EDU-409 List 1
January 26, 2000
9
A
LARMS
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.
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
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.