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    BID 700 (Vendor)

    This was the synchronizer for BID610. The 610 had 2 modes of operation - Mode A ,self sync for landlines and quality radio links i.e. microwave. The disadvantage of this mode was one error would propagate through the registers, produce an unacceptable garble, and require a further "N" characters to clear.

    Mode B used the BID700 to produce timing pulses and keep the receive in step with distant transmitter. It also enabled traffic flow security. This was the usual mode for HF links.


    crypto/bid700_2.jpg
    BID700 with cover off. To its right is one with cover on. Blank panels are installed in the top most position of the the other racks. It is believed that the racks without BID700 are the local circuits working "Mode A" using landline/microwave links. This was a standard layout for full duplex HF link - two 610's (Tx and Rx), two control units (under the 700), and 2 power supplies at the bottom of the rack. (Photo submitted by Ray Fortin)