This query is sent to the online modem of a 1:1 pair. It provides access to the fault status information (FLT?)
of the offline modem. This is the only way to interrogate the status of an offline modem at the distant-end of
a link. The response format may be:
No_1for1 = Indicates that no 1:1 system has been detected. Presence of a 1kHz signal from the
CRS-150 is used to indicate a 1:1 set-up;
No_Comms = Indicates that a 1kHz signal has been detected, but that there is no (or not yet) a response
for the modem;
abcdef = The FLT? response information from the offline 600L unit; or
Unit returns the current highest-priority fault and status codes for the Unit (hardware), TX Traffic, RX Traffic, and ODUs:
a = Unit status:
0 = No faults
1 = Power supply fault, +5 volts
2 = Power supply fault , +12 volts
3 = Power supply fault, –5 volts
4 = Power supply fault, +3.3 volts
5 = Power supply fault, –12 volts
6 = Power supply fault, +2.5 volts
7 = Top Card comms
8 = Tx synthesizer lock
9 = Rx synthesizer
A = Top card load fail
B = TPC/LDPC FPGA load fail
C = HDLC FPGA load fail
D = CnC FPGA load fail
E = VersaFEC FPGA load fail
F = Calibration data missing
Exception – 600L: F = Rx synthesizer2
G = Reference unlocked (Note: Tx off)
H = TXDCM fail
I = Over Temperature Alarm
J = Packet Processor mailbox fault
K = Fractional CnC use only
b = Tx Traffic status:
0 = Tx traffic OK
1 = No clock from terrestrial interface
2 = Tx FIFO slip
3 = AIS detected on incoming data
4 = AUPC upper limit reached
5 = (Hi-Stab) No External Ref found (no activity)
6 = BUC summary alarm (if ABA enabled)
7 = G.703 Loss of Signal (only valid in Clock Extend Mode)
Exceptions – 600L:6 = BUC current
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