150-409-115-05, Issue 5Alarms

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

Indicates synchronization is being attempted between the

per second

EDU-409 List 1 and the upstream (network) module.

Flashing Green more

Indicates synchronization is being attempted between the

than once per second

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

Indicates an HDSL Cyclic Redundancy Check (CRC) error has

second

occurred between the EDU-409 List 1 and the upstream module.

 

See "Technical Specifications" on page 21.

Flashing Red more

Indicates an HDSL CRC error has occurred between the

than once per second

EDU-409 List 1 and the downstream module. See "Technical

 

Specifications" on page 21.

Flashing Yellow once

Indicates an NDU (Network Doubler Unit) loopback is in effect in

per second

the EDU-409 List 1 towards the network. This tests the integrity of

 

the upstream span.

Flashing Yellow more

Indicates a CDU (EDU-409 List 1 to customer) loopback is in

than once per second

effect in the EDU-409 List 1 towards the customer. This tests the

 

integrity of the downstream span.

 

 

EDU-409 List 1

January 26, 2000

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