
		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 Telephone Interface (FXS)

Product No. 700-15-04

The Telephone Expansion Board (FXS) is one of a suite of options cards available for the Mercury Interface Unit (MIU).

The FXS board provides a standard interface for up to four (4) analog telephones or other telephony devices.

This allows Mercury subscribers to make and receive calls anywhere on the enterprise. It can be used for point-to-point calls or conferences with other telephone handsets, Mercury intercom panels, radios, phones and other devices connected via the Mercury Telephone Expansion Board (FXO), and VOIP phones connected to the Mercury enterprise.

Comprehensive support is provided for all major Codecs with echo suppression implemented using DSP based adaptive filtering.

Provides standards-based trunks to third-party PBXs and FXO devices.

Key Features

Provides a standard interface for up to 4 analog telephones
Provides subscribers with a familiar, low-cost interface
Allows subscribers to navigate the Mercury enterprise using a DTMF keypad
Can be used to access a landline at any location on the Mercury enterprise
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

Specifications

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
Connectors
Line	RJ11 2 pin modular jack socket
Phone connector pinout	Pin 3 – ring (A), Pin 4 – tip (B), other pins - unused
Ringing
Ring Cadence	US Ringtone
Echo Suppression
General	DSP Based adaptive filter providing acoustic & network suppression
Tail length (acoustic)	39.5ms
Tail length (network)	24ms
ERLE	30dB typical, network and acoustic
Environmental
Dimensions (WxDxH)	140mm (5.5”) x 205mm (8.1”) x 17mm (0.67)
Weight	170g
Operating temperature	0 to +50°C. Storage –20 to +85°C
Operating humidity	Relative humidity 0 to 90% non-condensing