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Comrex > Envoy
ENVOY ISDN Audio Codec
ISDN Remotes have never been easier

 
Features & Benefits
Built-in Terminal Adapter and NT1
Bidirectional 7.5 kHz audio at 56/64 kb/s
Bidirectional 15 kHz audio at 112/128 kb/s
Ancillary data capability
4 mic inputs (2 mic/line switchable)
3 headphone outputs

The Envoy Mixer includes
4 microphone inputs on standard XLR connectors. Two of these inputs are mic/line switchable.
The 4th mic/line input can be routed to the main program mix... or just to the headphones for local
cueing.
3 headphone outputs on 1/4" phone jacks.
Headphones may be set up for either a mix or split feed of local and return audio.
PLUS
A separate line level output on XLR can feed a PA system, recorder, etc.
This output may be muted with a front panel push switch.
The outputs are an externally controllable mix of local program audio and studio return.
Program inputs may be muted with a single front panel push switch.
Other Envoy features
Quick-dial memory feature allows one button dialing of up to 20 pre-stored numbers,
plus last number redial.
Specific ISDN information, including SPIDs, switch types and LDNs,
may be saved for up to 10 different sites.
The Envoy automatically adapts to answer ISDN calls at 56, 64, 112 or 128 kb/s.
And more cool stuff
The Envoy includes an ancillary data channel of 4800 baud, allowing a user to pass data between
two computers... great for call screening or delivering sports scores.
A contact closure is available on the Envoy which is automatically enable upon connection.
An internal peak limiter is included.
Low delay
The coding delay is only 6 milliseconds to allow free-flowing, interactive communication.

Specifications

Envoy
Connections

Audio In : 3-pin XLR female
Audio out : 3-pin XLR male
Headphone out : 1/4" stereo phone jack
Tel Line and Tel Set : RJ11C 6 pin modular jack
Contact closure : 1/8" 2-conductor mini-jack
Ancillary data port : 9-pin D connector
Levels

Audio Input :
Mic Input : 70 to -40 dBu @2K ohms
Line Input : -10 to +10 dBu @20K ohms
Audio Output :
Max output : +12 dBu @ 100 ohms
Frequency Response :

7.5kHz at 56/64 kb/s
15 kHz at 112/128 kb/s
IMUX Protocol : Bonding
Switch Protocols supported

For North American "U" interface :
National ISDN 1, AT&T 5ESS (Point to Point or Multipoint), Northern Telecom DMS100
Power : External Supply: 120/240 VAC 60/50 Hz
Size : 13"W x 9"D x 3.5"H
Weight : 3.5 lbs