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Text on Display Description / Cause / Notes
Relays To Terr To Sat Other
P300H P300 Series Installation and Operating Handbook Page 217
TX TRAFFIC FAULTS (Top line of display)
Tx Traffic Faults: Tx OK LED Off and Tx Traffic (prompt) relay.
Tx Warn: Reconfiguring Tx path The modem is reconfiguring the Tx path (after a user parameter change).
Tx Fault: <line> off, terr <DTE/DCE> not <line> depends on the interface in use (eg RS422 DCE=”TR”, V.35=”DTR”). This is a DC control T TF
ready line which is used to indicate the terrestrial equipment is functioning properly. The <line> switching
off may be user set to cause this fault or be ignored (Change, Terr-Int, Control Lines).See note 5.
Opt Opt
Tx Fault: <line> off, nothing to send <line> depends on the interface in use (eg RS422 DCE=”RS”, V.35=”RTS”). This is a handshakeT CM
line which is used to indicate the terrestrial equipment has data to send. The <line> switching off TF
may be user set to cause this fault or be ignored (Change, Terr-Int, Control Lines). The Modem can
be set to mute the Tx carrier if this line is off (Change, Tx, Mod, Carrier). If carrier is set to mute
when this line is off but this line is set to ignore, then there is no alarm when this line mutes the
carrier. See note 5
Opt Opt
Tx Fault: No clock from interface The modem is set to use the “Tx Clock In” (Change, Tx, Clocking), but no clock is being provided. T TB SA,SC TF
The clock generation will use the internal clock as a backup to maintain the carrier and any
framing/ESC integrity. Check the data connector is attached and for activity on the clock input lines
Tx Fault: Data input is all ones (AIS) The data supplied to the modem is all ones (AIS). This is normally used to indicate an upstream T TB SA ,
equipment fault, it is not a modem fault. See note 4 SC
Opt Opt Opt
Opt
Tx Fault: No Incoming Octet Timing This message is only displayed if a 64kbps G.703 card is fitted. It indicates the card has detected T
that there is no incoming octet timing on the G.703 signal. The monitoring of this octet timing may be
enabled and disabled with Change, Terr-Int, Card Specific.
Opt
Tx Fault: Frame sync lost on Tx input The modem only detects frame sync when the Drop mux is active (or 2048k IBS G.732 0% overhead T TB SA,SC
mode is enabled). Check the bearer type is specified correctly (Change, Tx, Baseband, Drop). This
normally only occurs if either there are significant errors on the terrestrial link, or if it is supplied with
AIS and the modem is set to ignore AIS. Check that the AIS detector is not disabled with Change,
User-Opt, Operation, Actions, AIS. ALSO there is an option to make the modem re-seek frame sync
if CRC sync is lost (Change, User-Opt, Operation, Terrestrial, PCM Bearer CRC, CRC/Frame Acq’).
Check the modem is not set to expect a CRC and forcing frame re-acquisition if CRC is lost, but
there is no CRC on the PCM signal.
Tx Fault: TS16 MF sync lost on Tx input The modem only seeks TS16 Multiframe sync when the Tx baseband is set to use the Drop mux in a T (TB/TE) SC
G.732 mode and CAS signalling has been selected (or 2048k IBS G.732 0% overhead mode with Note 1
CAS is enabled). Check that a CAS multiframe is present on the PCM signal applied to the modem
(ie terrestrial TS16 contains the 16 frame multiframe sequence).