1. AN/TRC-170 COMSEC Devices
CECOM LAR Operation Course
AN/TRC-170 COMSEC Devices
CECOM LAR Course
Logistics Assistance Division
Fort Monmouth, New Jersey
Students frequently have an imperfect understanding of COMSEC devices. This leads to problems in patching them in properly, attempts to use them incorrectly, and ineffective troubleshooting. A thorough understanding of the information in this chapter can resolve these problems.
Signal Flow

2. CECOM LAR Operation Course
KG-94 & KG-194
KG KY-58
Pictures of a KG-94 and a KY-58 are shown
The front panel of the KG-194 is very similar to the KG-94, except that there is no “firefly” CIK connector
Signal Flow

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Specifications
Dimensions
6.1” W x 5.7” H x 19” D
Weight
16.1 lbs
Input Power
19–55 28W Max
Max Data Rate
10 Megabits/Second
Operating Temps
-50 to +160 Deg F
Storage Temps
-70 to +160 Deg F
Nominal Operating voltage is 28 VDC and is supplied by LVPS 1 (TED 1) and LVPS 2 (TED 2).
The KG-94 is the older model and does not support a “Firefly” CIK. This model should have been replaced several years ago, but may still be found in a few units. You can arrange for upgrade to the KG-194 by contacting CSLA.
Both the KG-94 and KG-194 require a mount. The mount used in the TRC-170 is not standard.
It is essential for reliable operation, that the KG’s be fastened down completely using all four mounting screws.
Signal Flow

4. Purpose KG-194 #1 (Unit 5A1A1) KG-194 #2 (Unit 5A1A2)
Encrypts and decrypts the composite (group/supergroup) of either an LGM or the TGM for connection to the Tropo Modem
Cannot be used with a GM (MD01926) group
KG-194 #2 (Unit 5A1A2)
Decrypts and encrypts a TGM port/group
Normally used to convert an encrypted group from a user so that it can be utilized on port 1 of the TGM
Interchangeability
Physically Interchangeable
Not functionally interchangeable

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Controls
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, this function 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.
Signal Flow

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Indicators
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. If lighted along with the alarm key, may indicate that clock has not been patched to the KG.
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. If the light is off, but the KG is operating, replace or install the battery.
UPDATE - Two digit display which shows the current count of the updated key. Counter always reads "00" in FIREFLY.
Other
Battery - used to store loaded key if input power is lost. The KG will operate w/o a battery.
FUSE amp (Use a Slow Blow type in the TRC-170).
FILL - Load key with KYK-13, KOI-18, AN/CYZ-10 and KYX-15.
SPARE FUSE - Spare 1.5 amp (Use a Slow Blow type in the TRC-170).
DATA KEY (not shown) -Used to insert data key (CIK) for FIREFLY mode.
Signal Flow

7. Operating Procedures Importance of Patching
Importance of using a Fill Cable
Loading the KG
Updating a key with Change Key
Changing the key on an operational link
Performing a Local Update
Clearing the KG

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Signal Flow
Signal flow in the KG is relatively simplistic.
Red plain text Tx data is encrypted by the TED and sent out as black Tx encrypted data
Black encrypted Rx data is decrypted and sent out as red Rx plain text data
To avoid confusion on the TRC-170 patch panel remember…
Red Tx and Tc are inputs
Red Rx and Rc are outputs
Black Rx and Rc are inputs
Black Tx and Tc are outputs
Red Rc may be labeled as Red Station Clock out
Black Rc may be labeled as Black Station Clock in
Signal Flow

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Red & Black Connectors
This picture shows the inside of the adapter for KG #1
J1 & W151 are for Red I/O
J2 & W153 are for Black I/O and power
Note the importance of securing the KG’s into the adapter properly
Show where and how to check for pushed in pins
Signal Flow

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KG 1 Input & Output
Refer to Foldout 9-1 and reference KG I/O to the Patch Panel
Signal Flow

11. CECOM LAR Operation Course
KG 2 Input & Output
Refer to Foldout 9-1 and reference KG I/O to the Patch Panel
Signal Flow

12. CECOM LAR Operation Course
Patch Panel
Show normal patching for TED 1 used with the TGM or LGM
Show normal patching for TED 1 used to decrypt the output of a GM channel to TGM port 1
Note blank patches in the TED 1 and TED 2 blocks
Explain that data must be clocked out of the TED by BSC, and then out of the TGM by RSC, therefore there is no TPTC on either TED Red side.
Signal Flow

13. Strapping KG’s will not communicate unless strapping is compatible
Strapping should be checked if the KG does not operate normally or the link requires manual resynchronization
Use an anti-static work station or wrist strap
Be careful of security considerations

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Raytheon Strapping
This is the original strapping as recommended by Raytheon and approved by NSA
Signal Flow

15. CECOM LAR Operation Course
CSLA Strapping
This is the strapping recommended in the Strapping TB published by CSLA
Signal Flow

16. KYK-13

17. CECOM LAR Operation Course
Controls & Indicators
P1/J1 Connectors
Battery
Mode Switch
Parity Lamp
Initiate Switch
Address Select Switch
Describe Controls and Indicators
Signal Flow

18. CECOM LAR Operation Course
KYK-13 Operation
Checking/verifying a key variable
Loading a key into the KYK-13
Loading a key from the KYK-13
Zeroing (erasing) a single key
Zeroing all keys
Importance of the Fill Cable
Briefly review operation
Signal Flow

19. AN/CYZ-10 Data Transfer Device
CECOM LAR Operation Course
AN/CYZ-10 Data Transfer Device
The AN/CYZ-10 is in the process of replacing KYK-15 and KYX-15 fill devices in the field
Signal Flow

20. CECOM LAR Operation Course
DTD Basic Operation
SOURCE: LOADED DTD
TARGET: EQUIPMENT
INSERT CIK AND TURN ON
TURN DEVICE ON
SELECT APPLICATION (APPL)
CONNECT FILL CABLE
SELECT FILL APPLICATION (F403)
SET DEVICE FUNCTION (OR SWITCH) TO LOAD OR KEY LOAD
SELECT UTILITY FUNCTION (UTIL)
SELECT SETUP THEN PROTOCOL
SELECT CFD THEN K13 OR K15
PRESS MAIN MENU THEN SELECT XMIT
PGUP/PGDN TILL DESIRED KEY IS DISPLAYED, MARK BY PRESSING ENTER
SELECT SEND THEN PRESS ENTER UNTIL “Press initiate on receiving station” is displayed
PRESS INITIATE (OR SIMILAR FUNCTION)
REPEAT AS NECESSARY
Review basic operation for filling a device from the DTD
Refer students to the TM or Quick Reference Guide for additional information
Signal Flow

21. KY-58 DVOW COMSEC

22. KY-58 Controls & Indicators
CECOM LAR Operation Course
KY-58 Controls & Indicators
MODE
VOLUME
AUDIO IN
OFF-ON-TD SWITCH
VARIABLE (KEY) SELECT SWITCH
FILL CONNECTOR
BAT INSTL
Mode Switch
P – Plain Text, not useable in TRC-170
C – Cipher Text, encrypted voice operation
LD – Load position, loads a key into selected position
RV – Receive Variable, used for OTAR
VOLUME – Adjusts headset volume
AUDIO IN – Screwdriver adjustment that sets microphone gain
OFF-ON-TD Switch
OFF – KY-58 is powered down
ON – KY-58 is powered on in normal mode
TD – KY-58 is powered on in Time Delay mode (used when crypto sync problems are encountered)
VARIABLE SELECT
Z1-5 – clears keys in positions 1-5
1,2,3,4,5,6 – variable address position select
Z ALL – clears all keys, including position 6 (usually holds the KEK)
BAT INSTL – screws that hold the fill battery cover
Signal Flow

23. CECOM LAR Operation Course
KY-58 Basic Operation
Turn On
Loading a Key
Normal Operation
Zeroizing
1. TURN ON. Place the power switch to ON, the mode switch to C, Alarm should be heard in the headset a rushing noise with intermittent beeps in the background, pressing and releasing the PTT will clear this alarm. If nothing is heard in the headset check to insure that a good fill battery is installed.
2. LOADING A KEY. Using the KYK-13, after having done the turn on above (caution before connecting the KYK-13 insure it is in the OFF/CHECK position) Connect the KYK-13 to the KY-58 using a fill cable. On the KY-58 place the mode switch to LD, place the fill switch to the position to be loaded. On the KYK-13 place the mode switch to on and place the fill switch to the position which contains the key to be loaded. Press and release the headset PTT, one beep will be heard when the PTT is pressed and one beep will be heard when it is released. Continue to load other locations as required. When finished remember to place the KYK-13 mode switch to the OFF/CHECK position prior to disconnecting it. NOTE: If you press the Push To Talk (PTT) switch and hold it, if a constant tone indicates that the selected fill location has no valid COMSEC Key. If a Beep is heard, this is an indication that a valid COMSEC KEY has been selected. (CONSTANT TONE = NO KEY, BEEP = KEY)
3. OPERATION. To operate in the cipher text mode, place the mode switch at “C” and select the address location containing the required COMSEC Key. To operate in the plain text mode simply place the mode switch to P. However, operation in Plain Text (P) mode will not work in the TRC-170.
4. ZEROIZING. To zeroize all location simply place the fill switch to Z ALL, to zeroize fill location 1-5 simply place the fill switch to Z 1-5.
Signal Flow

24. Summary DVOW is encrypted by the KY-58
Data can be encrypted by the KG-194
Common Fill Devices
KYK-13
AN/CYZ-10
Transmitted data must be either encrypted by the user or the AN/TRC-170