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MIL-STD-188-185 Interoperability Standard For Uhf Misaltcom Dama Control SystemThis standard establishes mandatory requirements applicable to the channel controller \(CC\) to provide the capability for terminals to access pre-assigned \(PA\) or demand-assigned \(DA\) user-to-user communications \(UCOM\) services that operate on either 5-kHz or 25-kHz ultra high frequency \(UHF\) satellite communications \(SATCOM\) channels and represent the minimum requirements that must be implemented. Requirements in this standard may be exceeded by the CC to satisfy specific Department of Defense \(DoD\) requirements, provided interoperability is maintained. For example, the incorporation of additional standard and nonstandard interfaces is not precluded. MIL-STD-188-181 defines the modulation types and rates, forward error correction \(FEC\), interleaving, user-traffic communications security \(COMSEC\), and performance parameters that apply to the bursts employed for each transmission employed in this standard.

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MIL-STD-188-185A

PARAGRAPH

PAGE

FOREWORD ................................................. ii

SCOPE .....................................................1

Purpose...........................................1

1.1

Scope.............................................1

1.2

Application guidance..............................1

1.3

1.4

Government test requirements......................1

APPLICABLE DOCUMENTS ......................................3

General...........................................3

2.1

Government documents..............................3

2.2

Specifications, standards, and handbooks..........3

2.2.1

Order of precedence...............................4

2.3

DEFINITIONS ...............................................5

Terms.............................................5

3.1

Abbreviations and acronyms........................14

3.2

GENERAL REQUIREMENTS ......................................17

4.1

System overview...................................17

Waveform capabilities.............................17

4.1.1

Satellite access..................................17

4.1.2

General waveform structure........................18

4.2

TDMA frame structure..............................18

4.2.1

Burst structure...................................18

4.2.2

UCOM burst formats................................18

4.2.3

TDMA throughput delays............................19

4.2.4

Timing requirements...............................19

4.3

Downlink-timing requirements......................20

4.3.1

Uplink-timing requirements........................20

4.3.2

Guard time........................................20

4.3.3

4.4

Services..........................................20

4.4.1

Types of services.................................20

Preplanned services...............................20

4.4.1.1

Ad hoc services...................................21

4.4.1.2

Service access control............................22

4.4.2

4.4.2.1

Preplanned service access.........................22

4.4.2.2

Ad hoc service access.............................23

4.4.2.2.1

Orderwire messages................................23

4.4.2.2.1.1

Notification and directed messages................23

4.4.2.2.1.2

DROW messages.....................................23

4.4.2.2.2

Orderwire message format..........................26

4.4.2.3

Block assignment service access...................26

4.4.3

Service definition................................26

System FOW (SFOW) services........................26

4.4.3.1

iii