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DELTAMUX
Digital line multiplexer

DELTAMUX was a multiplexer for military telephone lines conforming to the EUROCOM standard, developed around 1978 by Philips Telecommunicatie Instrustrie (PTI) in Hilversum (Netherlands). It allows 16, 32 or 64 individual 2-wire subscriber lines, each with a data rate of 16 or 32 Kb/s, to be multiplexed into a 256, 512 ot 1025 kbit/s stream that can be carried to an exchange.

The unit was used to connect a local network of wired (field) lines – typically organised around a communications vehicle – to a remote exchange, by means of Line Of Sight (LOS) radio, or by wire. It could also be used as a hub between switches.

DELTAMUX was used by the Dutch Department of Defence, as well as by some other countries, including Greece. The device shown here was manufactured by PTI as part of the ZODIAC integrated communications system – developed by Holland Signaal – and was often used in combination with a MUCOLEX data encryptor.
  
Philips 8TR611 DELTAMUX unit

At the time, Holland Signaal in Hengelo (now: Thales) was a Philips subsidary. Most telephone-specific parts were developed and made at PTI in Hilversum, whilst the crypto-specific units were developed and made by Philips Usfa in Eindhoven. Holland Signaal had the overall responsibility.

PLEASE HELP – At present we have no further information about the Deltamux unit shown above. If you have any information, please contact us. We are also looking for the accompanying MUCOLEX encryption device. If you know a MUCOLEX unit that is available, please let us know.
Philips 8TR611 DELTAMUX unit
Front view
DELTAMUX front panel
Connections at the front panel
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Documentation
  1. Technische Handleiding, Multiplexer-Demultiplexer TD-4650
    Beschrijving en 3e echelons onderhoud (description and maintenance) (Dutch).
    3TH11-970/1. Royal Dutch Army, 28 March 1978.
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Crypto Museum. Last changed: Friday, 11 October 2019 - 19:22 CET.
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