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P300H P300 Series Installation and Operating Handbook Page 228
2: Normally, an incoming TS16 Multiframe backward alarm causes the modem to transmit a Satellite Frame Backward Alarm (SB) to be sent. However if the user control “Thin Route Spoof” (Change,
User opt, Operation, Terr/Sat, Thin Route Spoof) is set to “On” to “spoof” full bearer connectivity when passed over a “Thin Route” satellite circuit (ie not the whole bearer data rate), then an incoming
TS16 Multiframe backward alarm causes the modem to transmit a Satellite Multiframe Backward Alarm (SD, instead of SB) to keep the Frame and Multiframe backward alarm functions separate.
3: Line code setting: For P1431/32 cards check the switch on the card itself. For P1440/41/42 cards which are configured from the front panel check with Change, Terr-Int, Electrical, then reselect G.703
which is followed by the line code configuration.
4: All ones (the Alarm Indication Signal, AIS) is a means of signalling to downstream equipment that the data being sent is not valid. It is advised to leave AIS detection enabled so the modem can inform
you when there is a fault with the traffic. If necessary (eg if the data itself contains long strings one ones) you can disable the detection of AIS and resulting actions using Change, User-Opt, Operation,
Actions, AIS.
5: Check if this line is connected in the cable and supported by the connected device. If the line is floating (no cable/not supported) then it might `float` to the off state and intermittently raise this alarm.
6: The modem generates a temporary backup bearer for the Insert mux when set to “Loopthrough” only if there is no bearer available. Should the operator assume the modem is set to “Generate” not
“Loopthrough”, and feed the Rx bearer output back to the Tx bearer input (including via other equipment), then it will oscillate. Temporarily generating a backup bearer when there is no bearer
incoming, then as this temporary bearer is detected at the Tx input when fed back to the modem, it will switch off this temporary bearer and return to “Loopthrough” mode whereupon as there is now
no source for the bearer (it’s a compete loop), it will fail again and switch back temporarily to generating a backup bearer. If you see the modem displaying a bearer status switching between “Rx Fault:
Ins mux bearer frame sync lost”, “Rx Fault: Insert bearer AIS, generating”, and / or “Rx Fault: No insert bearer, generating”, then check that the bearer is not set to “Loopthrough” AND at the same
time looped back to the modem Tx input, even if via other equipment.
7: If the user control “Thin Route Spoof” (Change, User opt, Operation, Terr/Sat, Thin Route Spoof) is set to “On” to “spoof” full bearer connectivity when passed over a “Thin Route” satellite circuit (ie
not the whole bearer data rate), then a CAS backward alarm incoming on the Rx Input is passed to the terrestrial as a terrestrial Multiframe backward Alarm (SD). If “Thin Route Spoof” is not active,
the warning is still displayed but no actions are taken (ie SD is not generated).
8: You might try to clear the units non-volatile memory, then reconfigure the unit from scratch. From the main menu select 0, then User Parameters, Clr All + Reset. If this fails contact the factory for
an RMA number then return the unit for repair. If the unit will not boot to allow you to select from the screens, you can also clear the memory by powering up the unit while holding in the `NO` key (but
you have to hold the key in until the unit gives its normal three beeps).
9: If you wish to use Drop/Insert, and pass the incoming satellite timing to the downstream network, this is only possible by setting the Rx Insert bearer to “Generate” not “Loopthrough” (Change, Rx,
Baseband, Insert dialogue), and selecting Rx Clock as “Satellite” (Change, Rx, Buff/Clock, Gen’ Bearer Clock ). If the downstream equipment requires a terrestrial TS16 Multiframe, you must configure
the modem to use CAS, so the generated bearer has a TS16 multiframe.