Received messages – EXFO FTB-800 Series for FTB-1 User Manual
Page 414
Test Functions
404
FTB-700G/800 Series
FEAC
Received Messages
Displays current and previous alarms/status and loopback commands as
well as the link activity for the received DS3 signal.
Link Activity
None (All 1’s): An all ones pattern (11111111 11111111) has been
detected in the last second.
Alarm/Status: An Alarm/Status codeword has been detected in the
last second. An Alarm/Status is only detected when receiving at
least 10 consecutive occurrences of a specific codeword.
Loopback: A Loopback command message has been detected in
the last second. A valid loopback command is detected only when
receiving 10 consecutive occurrences of a specific Loopback
Command immediately followed by 10 occurrences of a specific
Channel Codeword.
Unassigned: An unassigned message has been detected in the last
second. An Unassigned message is only detected when receiving
at least 10 consecutive occurrences of a specific unassigned
codeword. An Alarm/Status codeword is also reported since
Unassigned is part of the Alarm/Status group.
Alarm/Status and Unassigned displays the current and previously
received Codeword messages.
Current indicates the last valid message, if any, received in the last
second of measurment.
Previous indicates the message, if any, that was received just
before the current measurement.