1240 CNS Multiplexer


1240 CNS Multiplexer

The range of 1240 CNS Fibre Optic Voice & Data
Multiplexers have been designed and optimised to
provide a point to point link, with optional cable path
protection for: -
Control Tower to Airfield Comms, Navigational Aids and

The 1240 CNS Multiplexers are in operational use at
London Heathrow, Birmingham, Manchester, Edinburgh,
and Belfast City, to name a few Airports.

A key strength of the 1240 CNS Multiplexer is it's
versatility to support all of the Manufacturers of Aviation
Comms, Navigational Aids & Surveillance Equipment/

Combination of Ethernet and Non-IP interfaces provide
a cost effective solution for transitioning to new CNS
IP based Systems.

The Ethernet IP interfaces support Radar Asterix, VoIP
ED137 and System Monitoring.

Proven ED137B & C VoIP operation, for up to 16
Ground/Air Radios with a separate IP network for
Radio Status, SNMP or System Management Monitoring.

The same CNS Multiplexer simultaneously supports up
to 8 legacy Air/Ground Radios, (4 wire Voice + E&M
signalling with or without phantom earth), permitting
easier transition from existing 25KHz to 8.33KHz

For Data requirements there are X.21/RS422/RS485 &
RS232 (V.24) interfaces, primarily used on Navigational
Aids and some Radars. 

Dual power feeds to the 1240 CNS Multiplexer are
provided to minimise a single point of failure.

The 1240 CNS Multiplexer has an 18Vdc to 72Vdc input
range, accommodating site locations having either 24V
or 48V DC battery systems, (positive or negative earth).

There is a generous 30dB optical light budget, maintained
over the lifetime of the 1240 CNS Multiplexer, achieved
by the built in compensation correcting & sustaining the
Laser's output level. 60Km distances should easily be

Additional features and capabilities have been added to
the 1240 CNS Multiplexer as a result of Customer
Feedback, experiences from Installation & Commissioning
and from Training Courses.

One of those has become a key feature of the 1240 CNS
Multiplexer range, the visual & status indication of
receive light levels, providing confirmation of correct link
operation. 4 LEDs show the amount of light being
received over the fibre link.

Remote light levels are available at the push of a button,
(& via Relay Contact Monitoring) minimising remote site
visits, simplifying fault finding with fibre breaks or
providing early warning of fibre loss degradation.

The range of 1240 CNS Multiplexers are designed for
extended lifetime service and attractive life time
ownership costs.

For futher information please 'Contact FTI',
details are given below: -