User's Manual

Configuration

RFI-148 & RFI-900 High Output Power Paging Transmitters User Manual Page 23 of 134

3.7.1 Hot Standby

For those RFI-148/RFI-900 that support it (refer to the product order codes in Appendix F), some LIU pins

are re-purposed, as shown in Table 5. The ‘lost’ alarms 11, 12 and 13 are made available when Hot Standby

mode is disabled. Refer also to 7.5.

Pin Number

Direction

Default function

Hot Standby function

Output

Alarm 11

PHSB MISSING - External PHSB unit is

missing/not detected

Output

Alarm 12

IN STANDBY - The transmitter is waiting for

permission to go active.

Output

Alarm 13

IS PRIMARY – this is the primary transmitter

of the redundant pair.

Input

LIU detection

CAN GO ACTIVE (HW) – the hardware

means of readying the transmitter for operating

in Hot Standby mode

Table 5:- LIU pin repurposing for Hot Standby support

3.7.2 Analogue Paging

Units that support the Analogue Paging feature repurpose certain LIU pins when this feature is enabled, as

identified in Table 6. When the feature is disabled, these pins are reallocated to their default function. Refer

to 8.2.1 for more information.

Pin Number

Direction

Default function

Analogue function

Input

CHAN 4

Audio +

Input

CHAN 3

Audio -

Input

Aux 1

Analogue/Digital Select

Table 6:- LIU pin repurposing for Analogue Paging support.