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A ppendix C. System Messages
1200420L1-1 ESU 120e User Manual C-3
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
-3
is being recieved at the
Drop Port interface.