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The final incarnation (or rather reincarnation) was a collection of alternative colour range Trimphones called the Phoenix phone or 'Snowdon Collection'. [4] BT, as the GPO had become, fitted these with the new plug-socket connection and they were available for purchase. [5] Various rotary dial 722 Trimphones:
Instructions for constructing a beige box can be found in many places on the internet, as well as instructions on how to make other phreaking boxes. [ 2 ] The alligator clips on a typical Lineman's handset usually include a part known as a "bed of nails" connector, allowing the clips to be attached to wires without removing their insulation.
BT also offered "wires-only" ADSL service and promoted the technique of using a separate plug-in filter on every socket. [13] While both technically inferior and far less tidy than the solution BT engineers had used, it was usually adequate and was simple enough for a non-technical householder to understand.
A lineman's handset typically connects via a pair of test leads, not the modular connector found on most consumer telephone equipment. The test leads will feature some combination of alligator clips (to connect to bare wires), a piercing spike or "bed-of-nails" (for insulated wires), and something designed to fit a punch block.
The first subscriber's phone (called the 'audio customer') would be connected as normal. The second subscriber (called the 'carrier customer') would have his phone calls modulated on to an RF carrier or Carrier wave on the same physical phone line at around 40 kHz – high enough not to be noticeable to the audio customer.
Mercury Communications was a national telephone company in the United Kingdom, formed in 1981 as a subsidiary of Cable & Wireless, to challenge the then-monopoly of British Telecom (BT). Although it proved only moderately successful at challenging BT's dominance, it led the way for new communication companies to attempt the same.
Developed by BT at Martlesham Heath and based on the Monarch PABX, the first example was put into service at Glenkindie, Scotland, in 1979, the year before the first System X. [2] Several hundred of these exchanges were manufactured by Plessey [3] and installed in rural areas, largely in Scotland and Wales. The UXD5 was included as part of the ...
Again, still also available in CB (no dial) form, it was a robust design which is still in use today in the UK, suitably modified for use with the New Plan BT sockets. It was available in two-tone green, two-tone grey, topaz yellow, concorde blue, lacquer red, black and ivory. The 706 was manufactured to a GPO design, by several manufacturers.