
		Mercury Interface Unit


		DSP Expansion Board


		Audio Expansion (AEB)


		Radio Interface Board (RIB)


		Telephone Interface (FXO)


		Telephone Interface (FXS)


		General Purpose Interface (GPI)


		Redundant Power Supply


		Solid State Drive


	View PDF Product Briefs

MIU Radio Interface Board (RIB)

Product No. 700-16-03

The Radio Interface Board (RIB) is an option board for the Mercury Interface Unit.

Connections between a Mercury system and a radio are comprised of audio and signaling components. Signaling refers to the methods that the Mercury system and the radio use to communicate with each other at a logic level. Typically, these are Push-to-Talk (PTT), Carrier Operated Relay (COR), Retransmit and Voice Operated Transmission (VOX). Audio refers to audio input and audio output. These components are used to couple the voice signals between a Mercury system and a radio.

The Radio Interoperability Board (RIB) supports eight channels of interconnection to radios or other devices. Each channel of the RIB supports audio in, audio out, PTT and COR (retransmit). Audio levels can be adjusted over a wide range to support different radio characteristics. Up to two seconds of audio delay is available on all audio inputs and outputs.

Typical applications:

Conducting communications between Mercury users and radios of any type, distributed over LAN, WAN or Internet
Bridging communications between different types of radios (UHF, VHF, 800MHz)

Specifications

Audio Input
Number of ports	8 per card. Max of 4 RIBs per MIU
Type	Balanced audio on RJ-45
Input impedance	>10kΩ
Nominal input level	0dBu
Input level adjustment	Via software from –9dB to +12dB with additional +20dB boost feature
Frequency response (3dB points)	<25Hz & >3200Hz (8kHz sampling) <25Hz & >6600Hz (16kHz sampling)
Distortion	<0.05% when routed locally
Noise	< -60dB un-weighted
Audio delay	Independent software adj. on each channel. 0-2000ms in 20ms steps
Filters	Audio inputs have selectable filters giving 3, 6 or 9dB cut/boost at 3kHz
Audio Ouput
Type	Electronically balanced on RJ-45 connector
Output impedance	<60Ω
Output level adjustment	Via software from -34.5dB to +12dB in steps of 1.5dB. Mute option.
Frequency Response (3dB points)	<25Hz and >3200Hz (8kHz sampling) <25Hz and >6600Hz (16kHz sampling)
Distortion	<0.05% when routed locally
Noise	< -60dB un-weighted
COR (GPI input from radio)
Type	Grounding contact - external equipment must provide ground closure.
Polarity	Software selectable
Input voltage range “on”	-2V to +2V (nominal) with respect to MIU 0V
Input voltage range “limits”	>-50V, <+60V
Attack (de-bounce) time	Adjustable 0-1999ms in 1ms steps
PTT (GPI output to radio)
Type	Solid state relay - RIB provides ground closure
Polarity	Software selectable
Absolute maximum voltage	+60V peak (AC or DC)
Max current	500mA
Hold time	0-5000ms in 1ms steps
VOX
General	All audio inputs can use VOX rather than PTT, software selectable
Attack time	Software adjustable 10-5000ms in 1ms steps
Release time	Software adjustable 750-5000ms in 1ms steps
Threshold	Software adjustable -10 to 50dBu
RJ45 Connector Pinout
Pin 1	COR (GPI) Input
Pin 2	COR/PTT Ground
Pin 3	PTT (GPI) Output
Pin 4	Audio In- (May be grounded if unbalanced audio is used)
Pin 5	Audio In+
Pin 6	Audio Ground
Pin 7	Audio Out+
Pin 8	Audio Out- (Must be grounded if unbalanced audio is used)
Environmental
Dimensions / Weight	142mm W x 210mm D x 17mm H / 200gm
Operating temperature	0 to +50ºC. Storage -20 to +85°C.
Operating humidity	Relative humidity 0 to 90% non-condensing
MTBF	80,000 hours