Paradise P300 specifications Change, Tx/Rx, ESC/Aux/BA, Backward Alarms Menu, Eeee, Aeee, Aooo

6.6.35Change, Tx/Rx, ESC/Aux/BA, BACKWARD ALARMS Menu

This screen is used to configure the four backward alarm inputs used in multi-destinational IDR or for lower rate multi-destinational operation in some of the Custom IBS modes.

Back’ Alm 1234: [?] E=Ext A=Auto O=OK 1=EEEE 2=AEEE 3=AOOO 4=AAAA

Change, Tx/Rx, ESC/Aux/BA, Backward Alarm Menu

This screen is at first difficult to understand, but is relatively simple. It allows the four backward alarm input to be mapped in certain ways, without any external backward alarm patching:

On the screen the letters mean as follows:

E=Ext:External patch, the state from the backward alarm connector on the rear panel connector will be sent (open circuit = OK, Ground = fail)

A=Auto:Auto, the alarm will be sourced internally from the summary Rx fail signal

O=OK:The alarm will always send the `OK` condition.

So the menu choices are as follows:

EEEE	All four alarms report the state from the Backward Alarm connector on the rear
	of the equipment . Use when transmitting a multidestinational carrier, but
	where the carrier we are receiving does not correspond to the destination
	allocated backward alarm channel 1. The Rx fail signals from the modems
	receiving the carriers from all the other destinations (including this modems Rx fail
	signal) must be externally patched into the corresponding external backward
	alarm inputs.
AEEE	Alarm 1 is internally connected to the Rx Fail signal, alarms 2-4 are available for
	external patching. Use when this station is transmitting a multidestinational
	carrier, where the carrier we are receiving corresponds to the destination
	allocated backward alarm channel 1. The Rx fail signals from the other modems
	receiving the carriers from all the other destinations must be externally patched
	into the corresponding external backward alarm inputs 2-4. If the external inputs
	2-4 are open circuit, then this is the same as AOOO below.
AOOO	Alarm 1 is internally connected to the Rx Fail signal, alarms 2-4 always send the
	OK state. Used in non multidestinational working, external backward alarm
	inputs are ignored.

AAAAAll four alarms represent the internal Rx Fail signal. Used in non multidestinational working, external backward alarm inputs are ignored.

In non multidestinational operation, the choice between the third and fourth options is down to operator preference or station policy.

P300H P300 Series Modem Installation and Operating Handbook Page 85