EXFO FTB-8100 Series Transport Blazer for FTB-500 - Manual (Page 315)

DSn Tabs
SONET/SDH Application 301
DS3 FEAC RX
DS3 FEAC RX
The DS3 FEAC RX tab gives current and previous alarms/status and
loopback commands as well as the link activity for the received DS3 signal.
Note: The DS3 FEAC RX tab is available when the DS3 framing is set to C-Bit
Parity (see page 293).
Press TEST, DSn-PDH, and FEAC (under DSn-PDH RX).
Configuration
Enable FEAC: Enables DS3 FEAC codeword configuration and analysis.
Link Activity
³
No Activity (All 1’s): An all ones pattern (11111111 11111111) has been
detected in the last second.
³
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.
³
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.