Siemens TC12 Installation, Commissioning And Maintenance Handbook page 161

If ONLY any of the following faults are recorded when in Outstation or Monitor
mode, Whilst OTUs respond with out faults to test set in Instation mode:
BIC, CMS If Instation not transmitting sufficient bytes and OTU is last on the
line
RCRC If OTU replying with too many of to few control bytes
POSSIBLE FAULT:
If ANY of the following Recorded whilst in Outstation Or Monitor mode.
On test set, CFE, CCRC, BIC, SCM, SL, Not Yet Synchronised.
POSSIBLE FAULT:
WHILST CHECKING AT OUTSTATION:
If ONLY any of the following faults are recorded when in Instation or Monitor
mode, Whilst UTC TCC/Instation operates with out OTU faults when test set is
used to simulate the OTU, i.e. in Outstation mode:
On test set, Reply Idle and/or CD indicator not showing carrier being
detected.
POSSIBLE FAULT:
If ONLY any of the following Recorded whilst in Outstation Or Monitor modes,
Whilst OTU responds with out faults to test set in Instation mode.
On test set CFE, CCRC, Not Yet Synchronised, BIC, SL.
CNL1 Inter message gap between last reply message and start of next
control message being infringed upon, check OTU replies especially
OTU at last address.
POSSIBLE FAULT:
If ONLY any of the following Recorded whilst in Outstation Or Monitor modes,
Whilst OTU responds with out faults to test set in Instation mode.
666/HE/43100/000
TC12 Installation, Commissioning & Maintenance Handbook
Due to Control data errors e.g. incorrect numbers for
OTU or incorrect numbers of OTUs on the line.
Data corruption due to incorrect baud rate at in station
or faulty modem board.
Outstation not transmitting, to confirm simulate OTU
with test set, i.e. switch ITS to Outstation and check that
UTC TCC/Instation is communicating with it. If the ITS is
replying and Instation is not recording OTU faults.
Check OTU fault log to determine reason for OTUs
failure to reply.
Data corruption due to line or Instation. If already tested
at Instation and no fault indicated by test set when this
OTU is simulated with test set in Outstation mode, this
would now indicate Line or Interference from another
OTU on the line.
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