Avaya 03-300430 User Manual

The yellow LED is used to indicate the state of the fiber interface, the fiber channel, and the 
DS1 channel as listed in 

on page 262 in order of 

priority.

Below the three standard LEDs on the DS1C circuit pack are four green LEDs that indicate 
whether a receive signal is present for each of the four DS1 facilities. 

on page 263 shows which facility (A, B, C, or D) corresponds to 

each LED. If a green LED is off, there is a Loss of Signal condition on the DS1 facility 
associated with that LED. The presence of a signal does not guarantee that the signal is using 
the correct framing format or line coding; an Alarm Indication Signal indicating that the opposite 
end of the DS1C complex is out of service may be present.

0.1 sec

0.1 sec

Fiber Out-of-Frame or Fiber Loss of Signal

0.5 sec

0.5 sec

In Frame, fiber channel down. The fiber channel communicating between 

the DS1C and the other fiber endpoint (EI or SNI) is down.

1 sec

1 sec

In Frame, DS1 channel down. The channel between the two DS1Cs in the 

DS1C complex is down.

solid on

DS1C active. This is the normal state for an active DS1C.

solid off

DS1C standby. This is the normal state for a standby DS1C in 

critical-reliability systems (duplicated PNC).