A ppendix C. System Messages

D rop Port Interface

The following messages indicate a condition on the Base Drop (PBX) in- terface:

Loss of Frame

Drop Port unable to frame align with incoming

 

FAS/NFAS framing pattern. Remote Alarm

 

(Bit 3 TS0 NFAS word) is transmitted on the

 

drop port interface.

 

 

Loss of TS16 MF

Drop Port unable to sync on TS16 multiframe

 

signal. Valid only when CAS/TS16 framing

 

enabled. Remote multiframe Alarm is

 

transmitted out the drop port interface. AIS is

 

transmitted out the drop port in TS16 only.

 

 

Loss of CRC-4

Drop Port unable to sync on CRC-4 multiframe

 

signal. Valid only when CRC-4 framing is

 

enabled. Remote Alarm is transmitted out the

 

drop port interface. AIS is transmitted out the

 

drop port.

 

 

Loss of Signal

No signal detected at the drop port interface.

 

 

Remote Alarm

Remote alarm signal (Bit 3 of NFAS word)

 

being received at drop port interface.

 

 

Remote MF Alarm

Remote multiframe alarm signal (Bit 6 of TS16

 

for three consecutive multiframes) being

 

received at drop port interface.

 

 

AIS Received

Unframed ones being received at the Drop Port

 

interface.

 

 

Frame Slip

Indicates clock being received at drop port is

 

different frequency than network clock.

 

 

Excessive BER

Excessive Bit Error ratio. A bit error ratio of

 

greater than 1X10-3is being recieved at the

 

Drop Port interface.

 

 

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ESU 120e User Manual

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ADTRAN ESU 120e user manual Rop Port Interface