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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

5.6.1.2.1

Unencrypted DROW transmission.....................212

5.6.1.2.2

Unencrypted DROW reception........................212

5.6.1.3

Encrypted FOW processing..........................212

5.6.1.3.1

Encrypted FOW transmission........................213

5.6.1.3.1.1

FOW encryption with newly generated Scrambled

KG ID number......................................213

5.6.1.3.1.2

FOW encryption using previously generated

Scrambled KG ID number............................214

5.6.1.3.2

Encrypted FOW reception...........................215

5.6.1.3.2.1

FOW decryption when Orderwire Encryption message

is included.......................................215

5.6.1.3.2.2

FOW decryption when Orderwire Encryption message

is not included...................................217

5.6.1.4

Encrypted DROW processing.........................218

5.6.1.4.1

Encrypted DROW transmission.......................218

5.6.1.4.2

Encrypted DROW reception..........................219

Time Slot Number (TSN) format.....................220

5.6.2

Switching time....................................221

5.7

Loss of bit count integrity.......................222

5.8

NOTES

...................................................223

6.1

Tailoring guidance for contractual application....223

6.2

Subject term (key-word) listing...................223

6.3

Major technical changes...........................223

6.4

Half-duplex terminal conflicts....................224

6.4.1

FOW time slot contention..........................224

6.4.2

DROW time slot contention.........................225

6.5

Common elements of the FOWs.......................225

6.6

Service types and status..........................228

6.7

Reserved..........................................228

6.7.1

Reserved..........................................228

6.7.2

Reserved..........................................228

6.8

Method for time slot counting in contention

DROW retry protocol............................

228

6.9

Terminal Configurations and addressing............229

6.9.1

I/O ports.........................................229

6.9.2

T/R units.........................................230

6.9.3

Terminal operation................................230

6.9.4

Addressing........................................231

6.10

Reducing DROW transmissions.......................231

FIGURE

General TDMA frame structure .......................19

Types of channels and typical services .............34

Start-of-frame timing ..............................36