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Telephone Interface Board (FXS) (700-15-04) (LAST TIME BUY)

Optional interface board for up to four analog telephones or other telephony devices, allowing Mercury subscribers to make and receive calls anywhere on the system.


  • Up to 4 Telephone Interface Boards per MIU
  • Provides a standard interface for up to 4 analog telephones
  • Allows subscribers to navigate the Mercury system using a DTMF keypad
  • Can be used to access a landline at any location on the Mercury system
  • Ring-down feature enables an immediate, dedicated connection with any Mercury subscribers
  • RJ11 connectors for easy cabling
  • Port-specific input and output level adjustments
  • Software configurable
  • Customizable dial plans

Item Code



Line Interface

Number of channels: 4 per card, Max of 4 option cards per MIU

DSP Channel usage: Programmable Signalling Loop start

DTMF: DTMF generation for dial-out

Line Impedance: CTR21, 600R, 900R or Japan – software selectable

Return loss: >18dB 300-400Hz

Protection: “on premise” level 1 protection

Ring Trip: Min 500R, typical 800R

Ringing capability: 500R for 40Vrms into REN=3

Ring voltage: 65Vrms typical, no load

Longitudinal to metallic balance: >40dB (300-600Hz); 45dB (600-3400Hz)

Common mode rejection ratio (CMRR): >40dB 300-3400Hz

THD: <1% at 0dBm, 1kHz

Crosstalk: <-85dB (inter-channel and inter-card)

Nominal line TX level: -9dBm ± 1dB

Input level adjustment: Via software –9dB to +12dB in steps of 1.5dB

Output level adjustment: Via software –34.5dB to +12dB in steps of 1.5dB. Mute option

Freq response: 300Hz – 3200Hz ± 2dB ref to 1kHz (8kHz sampling) with all echo processing and pre-emphasis disabled hours


Line: RJ11 2 pin modular jack socket

Phone connector pinout: Pin 3 – ring (A), Pin 4 – tip (B), other pins - unused


Ring Cadence: US Ringtone

Echo Suppression

General: DSP Based adaptive filter providing acoustic & network suppression

Tail length (acoustic): 39.5ms

Tail length (network): 24ms
Echo Return Loss: 30dB typical, network and acoustic Enhancement (ERLE)


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 205mm)


6.0oz (170g)


MTFB: 80,000 hours


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