MIU Telephone Interface (FXO)

Product No. 700-15-03

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

The FXO board provides a standard interface to four (4) third-party telephony systems like PSTN lines, PBXs, cellular telephone interfaces and other telephony devices.

Outside callers can dial into the Mercury enterprise and contact individual Mercury subscribers or conferences automatically or manually through an operator.

This option also allows Mercury subscribers to make outside calls from anywhere on the Mercury enterprise using any device with DTMF dialing capability. This includes intercom panels, radios with DTMF dial pads, analog phones connected via the Mercury Telephone Expansion Board-FXS, or VOIP phones connected to the Mercury enterprise.

MIU Telephone Interface (FXO)

Key Features

  • Provides a standard interface for four PSTN lines or other third-party telephony devices
  • Allows outside callers to access the Mercury enterprise and reach individual subscribers or conferences automatically or via an operator
  • Enables Mercury users to make and receive outside phone calls from anywhere on the system

Call Modes


Incoming
  • Auto-answer: incoming call is greeted with a dial tone, and caller uses a predefined DTMF dial plan to contact a specific Mercury subscriber or conference
  • Manual-answer: incoming call is automatically routed to pre-defined Mercury Hardware or software intercom panels for manual call handling
Outgoing
  • Line Access from Intercom Panels: a key on a Mercury panel is used to access a line and dial a call
  • Line Access from Other Mercury Subscribers with DTMF Capability: devices dial a series of digits to access a line and dial a call

Specifications

Line Interface
Number of channels 4 per card, Max of 4 option cards per MIU
DSP Channel usage 4 DSP IP channels per card, regardsless of whether the channel is routed to a different host
Signalling Loop start or ground
DTMF DTMF detection for DDOI routing
Bypass phone operation Phone is switched out of circuit whenever FXO channel is in use
Line Impedance CTR21, 600R, 900R or Japan – software selectable
Return loss >18dB 300-400Hz
Protection FCC pt 68 type B longitudinal surge, 1500V: FCC pt 68 type B metallic surge, 800V
Ring equivalency number REN <0.2
Longitudinal balance >60dB (200-1000Hz); 40dB (1000-4000Hz)
Common mode rejection ratio (CMRR) On hook >70dB 50-500Hz Vcm=60Vrms
Off hook >40dB 50-500Hz Vcm=60Vrms
Common mode overload level (CMOL) On hook >300Vrms 50-60Hz
Off hook >250Vrms 50-60Hz
Max trip/ring voltage 300V (Correct operation not implied) Recommended max 120V
Max loop current 90mA
Ringing voltage – detect Typically 22V, min 26V, 17-68Hz
Ringing voltage – no detect Typically 14V, max 18V, 1768Hz
THD <1% at 0dBm, 1kHz
Crosstalk <-85dB (inter-channel and inter-card)
Insertion Loss >0dB
Nominal line TX level -9dBm ± 1dB
Input level adjustment Via software –9dB to +12dB in steps of 1.5dB
Output level adjustmentVia software –34.5dB to +12dB in steps of 1.5dB. Mute option
Freq response 300Hz – 3200Hz ± 2dB ref to 1kHz (8kHz sampling)
Connectors
Line RJ11 2 pin modular jack socket
Bypass Phone 1 per channel (4)
Phone connector pinout Pin 3 – tip (B), Pin 4 – ring (A), other pins - unused
Ringing
Ring Cadence US Ringtone
Echo Suppression
General DSP Based adaptive filter providing acoustic & network suppression
Tail length (acoustic) 63.5ms
ERLE 30dB typical
Environmental
Dimensions (WxDxH) 140mm (5.5”) x 205mm (8.1”) x 17mm (0.67)
Weight 200g
Operating temperature 0 to +50°C. Storage –20 to +85°C
Operating humidity Relative humidity 0 to 90% non-condensing
MTBF 80,000 hours
 

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