Radio Interface Board (RIB) (700-16-03)

Radio Interface Board (RIB) (700-16-03)

Optional Interface for Half- or Full-Duplex Radios for Mercury MIU

  • Radio-over-IP and analog interfacing solution
  • Provides standard interface for up to 8 radios on each RIB
  • Up to four Radio Interface Boards per MIU
  • Port-specific input and output level adjustments
  • Audio buffering when connecting to higher power transmitters
  • Provides independent Push-To-Talk (PTT) and Carrier Operated Relay (COR) signaling for each port
  • Control signaling actuated by any local or remote Mercury operator connected over any IP network
  • RJ45 connectors for simple cable construction
Item Part Number:


The Radio Interface Board (RIB) is an optional interface board that provides a standard interface for up to eight full duplex and/or half duplex radios from a wide range of manufacturers.

Technical Specifications

Audio Interface
Number of ports: 8 per card. Max of 4 RIBs per MIU
Type: Balanced audio on RJ45

Audio Input
Input impedance: > 10kΩ
Nominal input level: 0dBu
Input level adjustment: Via software from -10.5dB to +12dB with additional +20dB boost feature
Frequency response: 20Hz to 20kHz (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 Output
Type: Electronically balanced on RJ45 connector
Output impedance: <60Ω
Output level adjustment: Via software
from -34.5dB to +12dB in steps of 1.5dB.
Mute option
Frequency response: 20Hz to 20kHz (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 (GPO 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

General: All audio inputs can use PTT or VOX triggering, 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 (GPO) 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)

Operating Temperature: 32 to 122°F (0 to 50°C)
Storage Temperature: -4 to 185°F (-20 to 85°C)
Operating Humidity: 0 to 90%, non-condensing, relative humidity

5.5 x 0.67 x 8.1 in (WxHxD)
(140 x 17 x 212mm)

7.1 oz (200 g)

MTFB: 121,000 hours

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