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BID/950 HORA

BID 950 was basically a replacement for BID 610 and BID 880 types. It is believed that the project was all part of the procurement of the BAe NIMROD AEW aircraft so the machines were initially sponsored by the RAF.

When used in the telegraphic mode, it was the equivalent of an installation of two BID 610 units with a BID 700 (although not compatible with them). It could be used in CTAK or KAK. Also, it was switchable between ITA2 and ITA5 in telegraphic mode with 1, 1.5 or 2 stop bits. There was also a pulse release mode.

In data mode it could communicate with another BID 950 or put into BID 880 mode to work with that machine type. Clocking speeds could be internal or external from the transmit or receive clocks (up to to 48 kbps from a DCE device such as a modem.

The BID 950 unit was a standard 19 inch rack type unit about 4 inches high and was modular in construction. There were 6 modules in all. All the modules were removable by undoing four screws at the corner of each module and withdrawing it from the front so maintenance could be carried out without having to take the complete unit out of its rack.

The BID 950 was designed and built by Plessey crypto in Liverpool, UK. Most of the electronics consisted of custom built ICs. Maintenance could be done down to component level replacement. Some depots returned all defective boards back to the manufacturer for repair. All the connections were on a backplane and of the Amphenol type except one connector on the front for use with a Fill Gun.

Keying material was loaded by using the tape reader on the front of the Fill Gun. One user reports "We only used the tape reader although I did try connecting the gun from a KG84 to the front connector and that worked fine. We used the BID 950 in both telegraphic and data modes and they proved to be quite reliable in service."

Most of the BID950's ran at 50 baud so their capability was greatly underutilized.

Another contributor says "It was great little machine apart from the interface which was always falling over due to static hits. This machine could handle ITA5, ITA7 and data up to a specified rate of 48 kbits/sec but the best we ever did was 47.999 kbps. ITA5 and ITA7 are International Telegraph Alphabets which are a way of formatting data to be sent. ITA5 consists of one start bit, five data bits and either one or one and a half stop bits, otherwise known as Baudot Code. ITA7 is an eight level code otherwise similar to ASCII plus a few other characters.

This crypto machine could be used in simplex or duplex mode and was completely self contained. Fill was available via a tape reader or a separate "gun" that could store about half a dozen daily fills. By using a socket at the back of the machine, one could fill it from a computer".