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

Optional interface board for up to eight full duplex and/or half duplex radios from a wide range of manufacturers.


  • 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 Code



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 8.1in (WxHxD)

(140 x 17 x 212mm)



7.1 oz (200 g)



MTFB: 121,000 hours

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