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BID 710
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BID/710

BID 710 was line interface. The 710 was used to interface 610/700 setups to the Bruin system or British Telecom landlines. When connected to Bruin, the 710 would interface to a TTVF 4/12 which converted telegraph signals to voice frequencies. Used as single unit it, provided 4 teleprinter channels over a phone line (or BID200, normally Channel 6 but after the data mod it was CH 5 ) When used with a combining box, it with three TTVF units you could get 12 channels of telegraph over a speech channel. The 610/700/710/TTVF setup was also used to connect to VHF radio.