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FM 24-17 Glossary
and their proper use.
CSN
channel sequence number
CSS
central security service (as used in this manual)
CSSCS
Combat Service Support Control System
ctrl
control
CW
continuous wave
date-time group (DTG) -
The date and time, expressed in digits and a time zone suffix, a message was prepared for
transmission. The DTG is expressed as six digits followed by the zone suffix; the first pair of
digits denotes the date, the second pair the hours, the third pair the minutes. When grouped with a
standardized abbreviation for the month and the last two digits of the year (for example, 081948Z
JAN 90), the DTG is a reference number for citing a record traffic message.
dedicated loop encryption device (DLED) -
A CCI used to secure record traffic circuits between designated CTs and AN/TYC-39() s and
between AN/TTC-39( )s and AUTODIN switching facilities.
Defense Communications Agency (DCA) -
Provides access to the worldwide DCS. The DCA DCS is obtained at specific in-theater
communications nodes at EAC. The DCA is being reorganized and renamed the Defense
Information Systems Agency (DISA).
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FM 24-17 Glossary
Defense Communications System (DCS) -
A worldwide complex of defense establishment communications networks and control centers
organized into a single compatible long haul general purpose system which provides theater-to-
CONUS connectivity. These circuits are managed by the DCA. Access to the worldwide DCS is
obtained at specific in-theater communications nodes at EAC.
Defense Data Network (DDN) -
A packet-switched network with two elements--backbone network (trunk circuits and packet
switches) and access network (circuits and equipment). Access circuits and equipment allows the
subscriber to connect to a vast network of several hundred packet switches worldwide.
Defense Operating Instructions (DOI) -
A series of publications that establish operating procedures and instructions for record traffic
within the DSSCS. DOI 103 is DSSCS operating instructions.
Defense Special Security Communications System (DSSCS) -
This is a critical intelligence communications system and special intelligence communications
network which provides for the transmission of CRITIC, SIGINT, and SCI record traffic.
Defense Switched Network (DSN) -
The DSN is the C2 telecommunications network for the US armed forces and other DOD
authorized users. The DSN will evolve from its present analog character towards a digital
communications network. DSN will include interface with foreign national tactical networks as
well as public telephone and administrative private line networks. This has replaced AUTOVON
(q.v.).
DGM
digital group multiplexers
DIA
Defense Intelligence Agency
DIAM
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FM 24-17 Glossary
Defense Intelligence Agency Manual
digital nonsecure voice terminal (DNVT) TA-1035/TT -
The DNVT is a 4-wire terminal contained in a ruggedized case which transmits and receives
digitized voice and loop signaling information. The DNVT provides digital communications
interface with MSE and EAC-CIP circuit switches. This equipment is also interoperable with the
DSVT.
digital subscriber voice terminal (DSVT) KY-68 -
A terminal device used in the intelligence community communications system, encrypted and
decrypted voice traffic, and provides secure digitized data traffic. The DSVT provides secure and
nonsecure access to the switched networks and secure access to nonswitched networks.
DISA
Defense Information Systems Agency (See Defense Communications Agency.)
DMS
Defense Message System
DOS
Disk Operating System
DSNET
Defense Secure Network
DTMF
dual-tone multifrequency
DTU
date/time update
ECB
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FM 24-17 Glossary
echelons corps and below
electronic mail (E-mail) -
Unclassified.
elm
element
emission security -
Component of COMSEC that results from all measures taken to deny unauthorized persons
information of value that might be derived from intercept and analysis of compromising
emanations from cryptographic equipment and telecommunications systems.
end of line (EOL) -
A series of computer functions that indicate to the computer terminal that the end of a line of text
has been reached.
EPLRS
Enhanced Position Location Reporting System
extension switches -
MSE extension node switch, either an SEN switch or an LEN switch. Extension switches allow
wire line terminal subscribers (telephone, facsimile, and data) as well as NRI and RAU to enter
the ACUS.
FAAD
Forward Area Air Defense
FAADC3I
Forward Area Air Defense Command, Control, Communications, and Intelligence
facsimile (fax) -
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FM 24-17 Glossary
Fax is a system of telecommunications for the transmission of fixed images (maps, graphs, and
narrative text) with reception in a permanent form. Used at brigade and battalion level in TRTS
for informal record traffic.
first in, first out -
An order of precedence for processing record traffic messages based upon the order in which the
messages were received. All priority messages would be processed before processing began on a
routine message.
FLCS
Force Level Control System
full-duplex -
A mode of operation that allows for transmission and receipt of voice or data messages over a
circuit. Two messages going in opposite directions at the same time over the same circuit. In wire
operation, the term 4-wire indicates a circuit is using two lines or channels for communications.
gateway (circuit switch) -
A switching center, located at corps rear boundary/EAC, that uses store and forward capability to
interface/access to theater user terminals, allied systems, and AUTODIN switching centers record
traffic.
gateway (packet switch) -
Provides a path for data flow between different networks. Gateways used to connect LANs with
other LANs or with WANs. In tactical application, connects tactical networks to DSNET 1.
GENSER
general service
GMT
Greenwich Mean Time
half-duplex -
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FM 24-17 Glossary
A mode of operation that allows data to be passed in either direction, but in only one direction at a
time. In a 2-wire circuit, the term half-duplex indicates a circuit using one line or channel for
communications in both directions.
inadvertent disclosure -
Accidental exposure of sensitive defense information to a person not authorized access. This may
result in a compromise or a need-to-know violation.
INFO
information
information addressee -
Organization listed on a record traffic message who has been forwarded the message for
information purposes only. No action on the information addressee’s part is required.
information service support officer (ISSO) -
An individual appointed by the commander of a post, installation, or equivalent command level to
act as the focal point and principal advisor for all information systems security matters.
initialize -
A process of entering selected and required information into terminal memory. The term refers to
all the actions taken to set up, turn on, and operate a terminal when it first enters service in a
network.
insecurity -
Any occurrence that may jeopardize the security of classified record traffic or cryptographic
material/items. Physical insecurities involve the loss, theft, capture, tampering, or unauthorized
viewing, access, or photography of classified material. A personnel insecurity occurs when a
person having access to classified information is suspected of espionage, defection, subversion, or
sabotage.
JANAP
Joint Army-Navy-Air Force Publication
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FM 24-17 Glossary
JOC
Joint Operations Center
JSOTF
Joint Service Office task force
JTF
joint task force
LAN
local area network
language media format (LMF) -
LMF is computer characters that inform the receiving terminal or switching center in what format
the message was prepared and what the required output will be at the addressee terminal.
LENS
large extension node switch
lightweight digital facsimile (LDF) -
A lightweight, one-man portable digital and analog facsimile terminal. It electronically transmits
black-and-white graphic or text information between remote or centralized military
communications facilities. The facsimile is designed for use with present and future digital
communications systems. LDFs may be mounted and used in tactical vehicles which are user-
owned and -operated.
MARFOR
Marine forces
MARKS
Modern Army Recordkeeping System
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FM 24-17 Glossary
MCS
maneuver control system
MCSF
Marine Corps Special Forces
message privacy -
Procedure applied to record traffic that ensures only authorized individuals obtain access. All
record traffic, both formal and informal, is processed with utmost privacy.
message switching -
The technique of receiving a message, storing it until the proper outgoing line is available, and
then retransmitting the message. No direct connection between the incoming and outgoing lines is
set up as is circuit switching. Message switching is done on a store and forward basis.
MILNET
military net
MLS
multilevel secure
mobile subscriber equipment (MSE) -
The MSE system covers the corps rear boundary forward to the division maneuver battalions rear
area of 37,500 square kilometers (15,000 square miles). Node centers make up the system’s
backbone and provide connectivity to extension switches and RAUs. The MSE system lets
subscribers communicate with each other on a discrete address basis, using fixed directory
numbers regardless of a subscriber’s battlefield location.
mobile subscriber radiotelephone terminal (MSRT) -
The MSRT provides users a means of discretely addressing switched common-user system users
by radio linkage. There are approximately 1,900 MSRTs within a corps area which allows
subscribers to communicate with other MSRT users within its radio range or to communicate with
wire subscribers and distant MSRTs through an RAU. The MSRT, combined with an RAU,
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FM 24-17 Glossary
allows subscribers to place full-duplex secure voice and data calls to fixed or mobile users.
mode -
In record traffic communications, different types of protocols are used for channel coordination to
transfer data from a switch to a switch, or from a switch to a terminal. In AUTODIN, modes I, II,
III, IV, and V are used in various equipments to switch configurations. In MSE, mode VI is a
duplex operation with automatic error and channel controls allowing independent and
simultaneous two-way transmission.
MPN
MSE packet network
msg
message
multilevel security operation -
A mode of operation in which various categories and types of classified record traffic may be
concurrently stored and processed within a system which permits concurrent access by users not
cleared for the highest category of information in the system and users having the proper
clearances and need-to-know. The separation of personnel and information on the basis of
security clearance and need-to-know is accomplished by the operating system and associated
system software.
NCA
national command authority
NCS
node control switch
need-to-know -
The necessity for access to, knowledge of, or possession of classified or other sensitive defense
information in order to carry out official military duties. Responsibility for determining access
rests with the individual who has current possession, knowledge, or control of the information and
not upon the prospective recipient.
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FM 24-17 Glossary
need-to-know violation -
The disclosure of classified or other sensitive defense information to a person who is cleared but
has no requirement for such information to carry out assigned duties.
net radio interface (NRI) -
Method for bridging between the commander’s two primary means of C2, tactical radio, and
telephone networks. NRI extends communications distance as it connects the tactical radio into
the division/corps wire system.
network gateway -
A special purpose dedicated computer that attaches two or more networks and routes packets from
one to the other. In particular, gateways are used to connect different large, medium, and small
networks.
node -
Signal center operated by US Army Signal Corps personnel.
NSWTG
Naval Special Warfare Training Group
packet switching/DDN -
Provided by a data packet-switch processor specifically designed for highspeed communications.
Provides for interconnection of multiple hosts in a local or geographically distributed
environment.
packet switching/MSE -
A system in which messages are broken down into smaller units called packets (a group of data
and control characters in a specified format that are then individually addressed and routed
throughout the network). The packet format allows data traffic to be forwarded over MSE without
competing with voice switching resources. In packet switching, data record traffic is
automatically routed around congested, damaged, or destroyed network components. All routing
is transparent to the user.
password -
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FM 24-17 Glossary
A word, character, or combination of words and characters that permits access to otherwise
inaccessible data, information, or computer files.
PC
personal computer
personnel security -
The procedures established to ensure that all personnel who have access to sensitive defense
information have the required authority as well as the appropriate security clearances.
physical security -
The component of COMSEC that results from all physical measures necessary to safeguard
classified equipment, material, and documents from access or observation by unauthorized
personnel.
plain language address (PLA) -
An abbreviated or nonabbreviated activity/organization title with associated geographical
location, used in message addressing. Standardized PLAs have been developed to eliminate
variances in the manner in which a specific organization may be addressed.
PSN
packet-switch network
PWDS
Protected Wire Distribution Systems
R
Worldwide Routing Indicator Community (GENSER - worldwide)
radio access unit (RAU) -
A high mobility multipurpose wheeled vehicle (HMMWV) and shelter with necessary electrical
components to provide mobile radiotelephone subscriber access to the mobile subscriber
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FM 24-17 Glossary
equipment system. There are 92 RAUs in a five-division corps.
RAM
random access memory
record traffic -
Messages in permanent or quasipermanent form that is recorded by the originator, the addressee,
or both.
routing indicator (RI) -
A series of letters assigned to indicate the geographical location of a terminal; a fixed
headquarters of a command, activity, or unit at a geographic location; and the general location of
a switch or terminal to facilitate the routing of record traffic over communications systems.
S variable -
Classified encrypt/decrypt key variable used in DSSCS record traffic. See the supporting signal
officer or COMSEC officer for additional information.
sanitize -
To rearrange/delete/overwrite recorded data information to prevent unauthorized disclosure. To
properly sanitize a CT, all initialized data is returned to factory default options.
SCIF
sensitive compartmented information facilities
sensitive compartmented information (SCI) -
Information and material that requires special controls for restricted handling within
compartmented intelligence systems and for which compartmentalizing is established.
secure voice system (SVS) -
The secure voice system replaces the automatic secure voice communications
(AUTOSEVOCOM) system. The SVS currently consists of the secure telephone units (STU-III)
to provide secure voice telephone service for common users and the RED switch program which
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FM 24-17 Glossary
provides high quality secure voice to C2 users on a network separate from the common-user
network.
SENS
small extension node switch
sensitive defense information -
Any information which requires a degree of protection and which should not be made generally
available. This type of information includes, but is not limited to, that information which must be
safeguarded to prevent damage to national defense and protect information which the commander
considers essential for the mission.
service message -
A brief, concise message between CTs or TCCs pertaining to any phase of record traffic handling.
SFOB
Special Forces Operational Base
SIGINT
signals intelligence
SINCGARS
Single Channel Ground and Airborne Radio
System single subscriber interface (SSI) -
Component of CT that allows connection of CT to various secure devices for
encryption/decryption of record traffic. SSI setup is accomplished by the supporting signal
officer.
SPECAT
special category
special security officer (SSO) -
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FM 24-17 Glossary
Individual or office who manages DSSCS record traffic, security clearances, and routine
administrative matters pertaining to special intelligence, critical intelligence, and SCI record
traffic.
speed-of-service -
The expected speed for each precedence of record traffic to be processed and delivered to the
intended addressees. Message originators expect/require record traffic to be delivered in the time
frame as indicated by the precedence they have assigned to their message.
SSI
single subscriber interface
SSN
station serial number
SSO
special security officer
store and forward -
A record traffic message handling technique whereby messages are received and held at a
message switch pending availability of outgoing circuits and then transmitted onward IAW the
designated precedence.
TAC
terminal access controller
TACCS
Tactical Army Combat Service (CSS) Computer System
TACFIRE
tactical fire direction system
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FM 24-17 Glossary
Tactical Record Traffic System (TRTS) -
A group of networks and systems that provide for the acceptance, transmission, receipt,
processing, and distribution of originated and terminated formal or informal record traffic
communications. Means include tactical TCCs with associated teletypewriters, messenger service,
and RATT; user-owned and -operated computer processors, facsimile sets and augmented
messenger service; Signal Corps-owned and -operated message and circuit switches; and the
DCA/DISA subsystems (AUTODIN/DMS/AUTOVON, DSN/DDN).
telecommunications center (TCC) -
An organization/section responsible for the acceptance, transmission, receipt, process, and
distribution of incoming and outgoing record traffic. TCCs will normally have three internal
sections to accomplish their mission--means section (transmit-receive), messenger section, and
message center section.
TPN
tactical packet network
transmission security -
The component of communications security that results from all measures designed to protect
transmissions of record traffic from interception and exploitation by means other than
cryptoanalysis.
TRC
transmission release code
TRI-TAC
joint tactical communications
TS
Top Secret
TTY
teletypewriter
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FM 24-17 Glossary
voluntary correction (VOL CCN) -
Communications term that means a message originator or a CT user has changed/corrected the
textual content of a previously transmitted message. A VOL CCN must be sent prior to the distant
end servicing the message for being garbled or incomplete. The complete message or a portion of
the message may be corrected by using VOL CCN.
WAN
wide area network
WX
weather
xmit
transmit
xmsn
transmission
Y
Worldwide Routing Indicator Community (DSSCS - SSO)
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References
SOURCES USED
These are the sources quoted or paraphrased in this publication.
Allied Communications Publication (ACP)
ACP 127. US Supplement l(H). Communications Instructions Tape Relay Procedures. May 84.
ACP 131. Communication Instructions Operating Signals. May 86.
Army Regulation (AR)
AR 25-11. Record Communications and the Privacy Communications System. 4 Sep 90.
AR 25-400-2. The Modern Army Recordkeeping System (MARKS). 15 Oct 86.
AR 190-13. The Army Physical Security Program. 20 Jun 85.
AR 380-5. Department of the Army Information Security Program. 25 Feb 88.
AR 380-19. Information Systems Security. 1 Aug 90.
AR 380-40. Policy for Safeguarding and Controlling COMSEC Information. 1 Jun 82.
Defense Intelligence Agency Manual (DIAM)
DIAM 50-3. (O) Physical Security Standards for Sensitive Compartmented Information Facilities. 2 May
80.
Defense Operating Instructions (DOI)
(S) DOI 101. DSSCS Address Groups (U). Jul 90.
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FM 24-17 References
(C) DOI 103. Operating Instructions: System/Data Procedures (U). May 90.
Department of the Army Forms (DA Form)
DA Form 1594. Daily Staff Journal or Duty Officer’s Log. NOV 62.
DA Form 1999-R. Restricted Area Visitor Register. Jan 88.
DA Form 2028. Recommended Changes to Publications and Blank Forms. Feb 74.
DA Form 3918-R. Facsimile Transmittal Header Sheet. Jul 90.
DA Form 4011. Telecommunications Center Delivery List. Apr 73.
DA Form 4016. Telecommunications Center Originating Message Register. Apr 73.
DA Form 5651. Message Control Log. Aug 87.
DA Form 5651-1. Terminating Message Register. Aug 87.
Field Manual (FM)
FM 3-5. NBC Decontamination. 24 Jun 85.
FM 3-100. NBC Operations. 17 Sep 85.
FM 5-20. Camouflage. 20 May 68.
FM 5-25. Explosives and Demolitions. 10 Mar 86.
FM 11-23. Theater Communications Command (Army). 28 NOV 72.
FM 11-30. MSE Communications in the Corps/Division. 27 Feb 91.
FM 11-32. Combat Net Radio Operations. 15 Oct 90.
FM 21-26. Map Reading and Land Navigation. 30 Sep 87.
FM 24-1. Signal Support in the AirLand Battle. 15 Oct 90.
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FM 24-17 References
FM 24-16. Communications-Electronics: Operations, Orders, Records and Reports. 7 Apr 78.
FM 25-101. Battle Focus Training. 30 Sep 90.
Joint Army-Navy-Air Force Publication (JANAP)
JANAP 128(I). Automatic Digital Network (AUTODIN) Operating Procedures. Mar 83.
JANAP 201(L). (C) Status of Noncryptographic JANAPs and ACPs (U). 1 Oct 83.
Technical Bulletin (TB)
TB 380-40-1. (O) Security Provisions for Use of TSEC/KY-65A and TSEC/KY-75A. 4 Feb 89.
TB 380-40-22. (O) Security Standards for Controlled Cryptographic Items. 29 Aug 86.
TB 380-41. (O) Procedures for Safeguarding, Accounting, and Supply Control of COMSEC Material. 1
Jul 81.
TB 380-41-3. (O) Procedures for Safeguarding Accounting and Supply Control of COMSEC Material,
Volume 3-- Accounting and Reporting Procedures. 30 Oct 85.
TB 380-41-5. (O) Procedures for Safeguarding, Accounting, and Supply Control of COMSEC Material,
Volume 5, Safeguarding COMSEC Material. 1 Apr 87.
DOCUMENTS NEEDED
These documents must be available to the intended users of this publication.
FM 11-490-2. Army Communications Facilities; Telecommunications Center Operating Procedures. 31
Oct 84.
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