Front Panel Status Indicator Led - ADC 2 User Manual

LTPH-UM-1234-01
LED
Flashing Red about
once per second
Flashing Red rapidly
Flashing Yellow about
once per second
Flashing Yellow
rapidly
Flashing Green about
once per second
Flashing Green rapidly Indicates synchronization is being attempted between the
Steady Yellow
Steady Green
HDU-409 Lists 1, 2, and 3
Table 2. Front Panel Status Indicator LED
Description
Indicates an HDSL Cyclic Redundancy Check (CRC) error has
occurred between the HDU-409 and the upstream module.
Indicates an HDSL CRC error has occurred between the
HDU-409 and the downstream module.
Indicates a Network Doubler Unit (NDU) loopback is in effect in
the HDU-409 towards the network. This tests the integrity of the
upstream span.
Indicates a Customer Doubler Unit (CDU) loopback is in effect in
the HDU-409 towards the customer. This tests the integrity of the
downstream span.
Indicates synchronization is being attempted between the
HDU-409 and the upstream (network) module.
HDU-409 and the downstream (customer) module.
Indicates the HDSL margin is less than the margin threshold
provisioned for the circuit.
Indicates HDSL frame synchronization has been achieved
between the HDU-409 and both the upstream and downstream
modules.
April 30, 2003
Product Description
5