KG-194A

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KG-194A
Trunk Encryption Device

Page Highlights

Dimensions, Weight and Power	KYK-13 Fill Device
KG-194A Block Diagram	Strapping Options
Controls and Indicators	TriTac Strapping Diagram
Operating Procedures	System Patching
Cabling and Rear Panel Connectors	Rack Adapter
Rack Adapter Specifications	Power Wiring Diagram

KG-194A Specifications

KG-194A
Dimensions	14.02" wide X 5.22" high X 8.61" deep
Weight	16.5 lb.
Input Power	19 to 56 V DC, 25 w

KG-194A Block Diagram

Front Panel Controls and Indicators

Battery - used to store loaded key if input power is lost.

Controls

Actuate - A push button switch used to initiate the test or operation selected by the function switch.

Function Switch

	RESTART - begins synchronization in the current key.
	CHANGE KEY - In traditional mode, starts synchronization in a new key. If KG is Full Operate, the current key will be updated on both ends. In the FIREFLY mode, it initiates a re-key where a unique key is developed.
	LOAD - Transfers a key from a fill device to a storage location in the KG.
	LCL UPDATE - Initiates a restart and an update at one end of the link. If resync has already been achieved, then it is inhibited. Not used in FIREFLY mode.
	ALARM TEST - Starts an alarm check sequence. Will not affect operation.
	LAMP TEST - Lights up all LEDs on front panel.
	ZEROIZE - clears all stored keys.

Power Switch

	ON - Supplies power to KG. Activates battery for key retention if power is lost.
	STBY - Removes power, but retains key.
	OFF or ZEROIZE OFF - Power is removed and key will be lost. Switch must be pulled before it can be set.

Indicators

	PARITY - Green LED lights to show a valid key has been loaded into the equipment. The light will go out during the next change key operation.
	OLD KEY - Yellow LED lights to indicate an unsuccessful key change was attempted. The light goes out when the procedure is successful.
	RESYNC - Green LED lights to show that synchronization between the local and remote units has occurred. This is a normal indication.
	FULL OPR - Yellow LED lights to show the equipment is operational.
	ALARM - Red LED indicates an alarm condition and shows that the KG has stopped sending traffic. It will flash once for a successful alarm check, certain incorrect operator responses and a bad key load.
	PWR ON - Green LED indicates input power has been applied and that logic and battery voltages are present.
	UPDATE - Two digit display which shows the current count of the updated key. Counter always reads "00" in FIREFLY.

	FUSE - 1.5 amp.
	FILL - Load key with KYK-13, KOI-18, and KYX-15.
	SPARE FUSE - Spare 1.5 amp.
	DATA KEY -Used to load data key for FIREFLY mode.

Operating Procedures

Turn On

When power switch is set to on, the update counter should read zero. Power on and alarm LED’s should be lit. If battery is not installed or is defective, the power on LED will not light.

Perform lamp test. All LED’s should light. The update counter should read "88".

Load

	Attach KYK-13 with fill cable to fill port on KG-194A.
	Turn KYK-13 mode switch to on.
	Turn function switch on KG to load.
	Press and release the actuate switch on the KG.
	Parity lamp on KYK-13 should flash.
	Parity LED on KG will light and power on and alarm LED will stay on.
	Turn the mode switch on the KYK-13 to off and disconnect it from the KG.
	Initiating a change key operation.

After loading, the following steps must be accomplished at both ends of the link on the KG-194A’s to establish a secure path for passing data.

	Turn the function select switch to change key and press the actuate switch.
	The alarm LED should go out, the old key LED should go on momentarily , and the power on LED should stay on.
	When the distant end has done the same, the KG units will synchronize and the resync and full operate LED’s will go on.
	Turn the function switch to alarm check. Press and release the actuate switch. The alarm LED will go on momentarily if the checks pass.

Updating the key with a change key operation.

	Only one KG in the link has to perform this operation and both KG’s in the link will update.
	Turn the function select switch to change key and press the actuate switch.
	The old key LED will light briefly. The resync and full operate LED’s will go out momentarily and then come back on. The update counter should advance by one digit.
	If the change key was not successful, the old key LED will remain on and the update counter will not advance.
	Both ends of the link must turn their function switches to restart and press the actuate switch.
	The link should be restored using the old key in the KG’s. The resync, full operate and old key LED’s should be on.
	Repeat the update procedure.

Changing the key of an operational link.

	The following should be performed when a new key is to be loaded into the KG’s on an operational link. This is different from updating variables on a key already loaded into KG’s on an operational link.
	Perform the loading procedure described earlier.
	The parity, resync, and full operate LED’s should be lit.
	Perform updating the key with a change key operation.
	Both KG’s in the link should have their resync and full operate LED’s on and the update counter should read "00".

Performing a local update.

	A local update is performed when one KG in the link must update its key to match the other KG. An example would be if a KG failed and was replaced, the new KG would be loaded with and local update would be performed until the update counters were the same on both KG’s.
	If needed, load the KG.
	Set the function select switch to local update and press the actuate switch enough times to make the update counters at both ends of the link equal.
	When the counters are the same, the resync and full operate LED’s should be lit.

KG-194A Installation Cabling Diagram and Rear Panel

KG-194A EXTERNAL CONNECTORS

KG-194A CONNECTOR	Connector P/N & Mating Connector P/N	QTY	FUNCTION
RED Signal Connector (J2)	MS27468T13F3535P MS27467T13F35S	1	Red Signal interface with Equipment
Black Signal Connector (J4)	MS27468T15F35P MS27467T15F35S	1	Black signal interface with Equipment
Fill Connector	ON241775 ON241774	1	Interface with fill devices
Power Connector	MS27468T11F98P MS2746T11F98S	1	Supply 19-56 V DC to TED
Ground (E1)		1	System Ground

KYK-13 - Electronic Transfer Device

P1 and J1 Connectors - Electrically the same connection. Used to connect to a fill cable, a COMSEC device, a KOI-18, a KYX-15, or another KYK-13.

Battery Compartment - Holds battery which powers KYK-13.

Mode Switch - Three position rotary switch used to select operation modes.

	"Z" - Used to zeroize selected keys.
	ON - Used to load and transfer keys.
	OFF CHECK - Used to conduct parity checks.

Parity Lamp - Blinks when parity is checked or load is transferred.

Initiate Push button - Push this button when loading or zeroizing the KYK-13.

Address Select Switch - Seven position rotary switch.

	"Z" ALL - Zeroizes all 6 storage registers when mode switch is set to "Z".
	1 THROUGH 6 - Six storage registers for storing keys in KYK-13.

KG-194A Strapping

The KG-194A must be physically "strapped" internally to provide operation compatible with the KG-81. The KG-81 is used by the U.S. Air Force and Strategic Terminals (Gateway Interfaces). This strapping is listed below:

E-GFX Board Receiver (Front)
STRAPPING	NAME	FUNCTION
E1 - E2 E5 - E6 E9 - E10	Bright Display	Chooses the brightness of the front panel display. Options are Bright or Dim.
E11 - E12	Up Data Counter Readout "Continuous"	The readout can be continuously displayed or program controlled to display only after certain program operations.
E15 - E16 E19 - E20 E23 - E24	Resynch Timeout 2⁰	This option specifies how many clock cycles of receive cipher text clock the KG unit will wait before executing a user RESYNC command. Choices are: 2⁰, 2¹⁰, 2¹⁴, 2¹⁶, 2¹⁷, 2¹⁸, 2²⁰, and No Timeout
E29 - E30	Key Generator Mode: Primary	Automatic re-keys. Primary when you want two KGs to acknowledge the resynchronization. Secondary does not require this acknowledgement of resynchronization.
E31 - E32	Clock: Internal	This clock options used to choose the origin of the clock signal used on the card. External is used for the ST-51 automatic test equipment use. Internal must be selected for normal operation.

GFY Board or GQY (Middle) Transmit
STRAPPING	NAME	FUNCTION
E1 - E2	Cooperative Synchronization: COOP SYNC	This will determine the manner of synchronization for the KG-194A. There are two choices, in COOP SYNC, the KG unit will send synchronizing data. In NOT COOP SYNC the KG will not send synchronizing data. It will wait to receive the synchronizing data.
E7 - E8	Traffic Inhibit: TRFC INHB	This lets you choose a manual (TRFC INHB) restart or an automatic (NOT TRFC INHB) restart.
E10-E11	PCB Internal Clock Mode: NORMAL	This strapping determines which PCB internal clocks is in use. The two choices are: Test- Provides internal clock to microprocessor for unit tests conducted at depot, and Normal- Provides internal clock for normal operation of unit.

GFW Board (Rear Left) Black INPUT-OUTPUT
STRAPPING	NAME	FUNCTION
E1 - E3 E5-E6 E9-E10 E14-E16	Resynchronization: DIFF DIFF CONN DIFF	RSYNC is a command from the modem which causes resynchronization to occur immediately, with no time out. Various input logic and impedance levels can be strapped. The choices are signal-ended (SE); differential (DIFF), not connected (NOT CONN) and connected (CONN). When RSYNC is not used, it must be strapped DIFF and NOT CONN.
E15-E17	Change Variable: OUT	The proper signal will initiate a change variable sequence.
E19 - E21	Zeroize VAR: OUT	A Proper signal will initiate a change variable sequence.
E23 - E25	Restart "OUT"	A proper signal will remotely trigger a restart.
E29 - E30	Alarm Level: LOW	Low: logic 1 = +0.3 to +3.0 V, logic 0 = -0.3 to -3.0 V
E31 - E32	RCTC Phase "Normal"
E33 - E34	RCTC Phase "Normal"
E37 - E38	RXCTCL "Center Tapped to GND"	The Receive Cipher Text Clock is strapped for balanced center-tap-grounded. The choice depends on the output voltage of the multiplexer.
E39 - E40	BSC "Center Tapped to GND"	The Black Station Clock is strapped for balanced center-tap-grounded.
E43 - E44	RXCT "Center Tapped to GND"	The Receive Cipher Text is strapped for balanced-center-tap-grounded.
E46 - E48	Resync Achieved level: LOW	Low: logic 1 = +0.3 to +3.0 V, logic 0 = -0.3 to -3.0 V
E47 - E49	Full Operate level: LOW	Low: logic 1 = +0.3 to +3.0 V, logic 0 = -0.3 to -3.0 V

E-GFV Board (Rear Right), Red INPUT-OUTPUT
STRAPPING	NAME	FUNCTION
E1 - E2	TXPT "Center Tapped to GND"	Transmit Plain Text is strapped for balanced center-tap grounded.
E5 - E6 E11 - E12	Resync Level: Contact Closure Resync Level: Contact Closure	Resync level is a signal from the LRM which calls for a resynchronization between two units. When the level is detected, the receiving KG-194 initiates the time out. Contact Closure= Logic 1 Closed, Logic 0 open.
E15 - E16	Data Monitor
E17 - E18	Spare
E19 - E20	Clock Monitor Spare
E22 - E24	RACTE: Connected	The Remote Actutate is connected. This allows the user to connect the input controlling the remote application of actuate normally done from the front panel
E27 - E38	Phase Monitor: Enable	This selects and enables Data Monitor and Clock Monitor for internal or remote control.
E30 - E32	Phase Select: Normal	This determines whether the clock is inverted where Transmit Plain Text is reclocked into the unit.