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P300H P300 Series Modem Installation and Operating Handbook Page 201
APPENDIX E: CUSTOMER SPECIFIC FEATURES
This appendix lists the customer specific options available on the P300 Series Modems:
Refer to the Change, User-Opt, Operation menu, section 6.10.8 on page 106 for explanations of how to
use these parameters:
RELAY MODE SETTING
0 Default (normal) relay operation.
1 Cable & Wireless (Alarms Summarise)
This feature remaps the external alarm relays to summarise the Traffic & Unit faults. Normally
these are separated as Traffic faults relate to faults external to the equipment (Prompt Traffic) and
Unit faults relate to faults within the equipment itself (Prompt Unit Fault). When this option is
selected the three fault relays map as follows:
Prompt Unit Fault: Any unit fault or Tx
traffic fault (ie Tx summary alarm)
Prompt Traffic Fault: Any unit fault or Rx
traffic fault (ie Rx summary alarm)
Deferred Fault: Function unchanged from normal
2 Tx Carrier On/Off indication (Software >=V2.12)
This feature provides a form C relay contact to indicate the Tx carrier On/Off state. It may be used
to indicate which one of a 1:1 pair is on-line and which off-line. When active the “Deferred Alarm”
output becomes instead a Tx carrier On/Off indication, mimicking the operation of the Standby LED
on the front panel. `Carrier On` corresponds to the no alarm condition, and `Carrier Off`
corresponds to the alarm condition. When used to indicate which one of a 1:1 pair is on-line, should
both Tx carriers mute (eg an external inhibit applied to both modems in a 1:1 pair), then the
deferred relays of both units would indicate the off condition.
3 P300 Clock mode selection (P300i/P310i modem/router only, Software >=3.41)
Normally the P300i/P310i data input is internally coupled directly to the output of the internal Linux
router. In this mode the Tx & Rx clocking modes for the modem are fixed (as the Ethernet port or
the router has no concept of clock direction). However under certain circumstances the internal
link from modem to router is broken and routed through a new rear connector (eg to insert a
Crypto). In such modes it is again useful to have manual selection of the clocking modes for the
modem, and activating Relay Mode 3, re-instates the clock mode questions on the modem front
panel dialogue.
4 L-Band 1:1 Switching - DC & References. (P310 L-Band modem only, Software >=3.62)
In a 1:1 L-Band system, if the modems are configured to supply DC and/or the 10MHz reference
`up the coax` to a BUC or LNB, then when a 1:1 changeover occurs, the modem which becomes
the standby switches off the DC & Reference feeds and these are now supplied by the new On-
Line modem (which switches them on). This is the NORMAL state, without this relay mode active.
This assumes the L-Band feeds are split/combined through an L-Band splitter/combiner which
passes the DC and reference out of the common port from either split port.
When this relay mode is active, the modems DO NOT SWITCH OFF the DC & Reference when
in standby, to accommodate 1:1 systems where each modem is coupled to one of a redundant pair
of BUC’s or LNB’s. This means that both BUC/LNB’s continue working whichever modem is on-line
(however the standby modem does of course inhibit the Tx carrier). Obviously if a splitter /
combiner as described above is used with this Relay Mode active, then the two slightly different
frequency 10MHz references will beat together, and cause the common BUC/LNB to fail.
5-15 Undefined at present