Universal interface in telephone networks using analog signallings

The IMUX family of network interface boards has been designed to allow the simple connection
of standard multiplexer voice channels to all telephone and PBX interfaces in common use.

Features:  
- Signalling protocols: DC5A - DC5A + Wink start, DC5D.
- Signalling frequencies (if applicable): 2280Hz/2600Hz.
- Status indicated by led's.
- Standalone cabinet or 5U-19" rack (for 10 boards).
- Power : 42 to 56 VDC.
- Gain Range : -20 to +10dB on each transmission path.