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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

5.2.2.4.3.4

Channel control status message....................131

5.2.2.4.3.5

DROW:CC Response message..........................132

5.2.2.5

Ranging burst fields..............................135

5.2.2.5.1

Preamble field....................................136

5.2.2.5.2

Ranging Epoch field...............................136

5.2.2.5.3

Pseudorandom Sequence field.......................136

5.2.2.6

UCOM burst fields.................................137

5.2.2.6.1

Preamble field....................................138

5.2.2.6.2

User Data field...................................138

5.2.2.6.2.1

User Data field content for circuit service.......138

5.2.2.6.2.2

User Data field content for ADT service...........139

UCOM burst formats................................139

5.2.3

UCOM burst formats employing PSK bit interleaving.139

5.2.3.1

5.2.3.2

UCOM circuit service burst formats employing

sub-framing.......................................140

TDMA throughput delays for circuit service........143

5.2.4

Throughput delay on 25-kHz TDMA channels..........143

5.2.4.1

Throughput delay on 5-kHz TDMA channels...........144

5.2.4.2

5.3

Timing requirements...............................144

5.3.1

Downlink acquisition..............................145

5.3.1.1

Locating the FOW..................................145

5.3.1.2

Downlink acquisition requirements.................145

5.3.1.3

Maintaining downlink acquisition..................146

5.3.2

Uplink acquisition................................147

5.3.2.1

Uplink-timing requirements........................147

5.3.2.2

Tolerable range uncertainty.......................147

5.3.2.3

Active ranging....................................148

5.3.2.3.1

Initial ranging...................................148

5.3.2.3.1.1

Selecting service for initial ranging.............149

5.3.2.3.1.2

Contention ranging-backoff protocols..............149

5.3.2.3.1.2.1

RBN determination.................................149

5.3.2.3.1.2.2

Contention ranging retransmission.................150

5.3.2.3.1.3

Setting uplink timing for initial ranging.........150

5.3.2.3.2

Maintenance ranging...............................150

5.3.2.3.2.1

Ranging epoch.....................................151

5.3.2.3.2.2

Identifying available ranging services............151

5.3.2.3.2.3

Selecting frame with required ranging epoch.......151

5.3.2.3.2.3.1

Selection protocol for RE of 256..................152

5.3.2.3.2.3.2

Selection protocol for RE of 512 or 1024..........152

5.3.2.3.2.4

Initial maintenance ranging attempt successful....153

5.3.2.3.2.5

Failure of maintenance ranging attempt............153

5.3.2.4

Passive ranging...................................154

Time slot guard time..............................154

5.3.3

Ranging time slot guard time......................154

5.3.3.1

UCOM and DROW time slot guard time................154

5.3.3.2

5.3.4

Ranging time slots allocation.....................155