This showed up on eBay and I couldn't resist.
It's very similar to the C-11166/GRC-206 Universal Radio System Control URSC which is part of the GRC-206 radio system (also see the MT-6250/GRC-206 rack mount).
LabelEastern Computers Inc.
Virgina Beach, VA 23452
M67854-95-C-3109 (a 1995 contract number)
p/n 400192-2 s/n 0026
Data I/O SMA FO
Handset U-229 Power
Controls & IndicatorsFront Panel Groupings
Radio/Crypo Control8 Radios numbered 1 to 8 each with its own 8 character 5x8 alphanumeric display and indicators for Mon, Tx, Rcv & Sec.
Telephone16 Telephone station buttons numbered 1...15, 1A, Hold; in addition there's two indicators (off hook, hold for each button?)
Intercom24 Intercom stations LEDs numbered 1 to 24 in addition LEDs for R1, R2 & R3.
Buttons: Listen, Over Ride, All Clear, Intercom with 2 LEDs above each
Intercom/Telephone5 control buttons each with 2 LEDs above: Conf, Chime, Spare, Com Ans, Rel
A 16 button military Touch Tone key pad
ESCape button, LEDs: Local, Remote
10 Buttons each with 2 LEDs above, except Increase & Decrease which are just buttons.
At the upper left of the front panel there's a black plastic part with a square hole. It looks as if something plugs into it and is held be a spring loaded ball.
Maybe a directory card with names to go with the device numbers on the front panel?
The C-11166/GRC-206 Universal Radio System Control URSC communicates with the MT-6250 rack mount holding 4 radios and their associated cryptographic equipment by means of a fiber optic cable with 2 bundles, one for each direction of data travel. The other end of the fiber optic cable goes to the C11169/GRC-206 Signal Distribution Unit SDU which in turn uses regular electrical cables to interface with the radios. The C-11166 remote is laid out with the idea that there will be two operators using it at the same time.
This remote does not have that dual operator type layout so maybe the reason for the two U-229 audio connectors is like a number of other military items were they are there to support flexibility in the audio accessories used.
MT-6250/GRC-206 rack mount
C-11166/GRC-206 Universal Radio System Control URSC
C11169/GRC-206 Signal Distribution Unit SDU
Cryptography - Crypto Patents
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Page Created 1 June 2015