MIL-STD-188-220D.pdf

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MIL-STD-188-220D w/ Change 1
CONTENTS
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 FOREWORD .................................................................................................................... .ii
1 SCOPE .................................................................................................................................1
1.1 Purpose. .....................................................................................................................1
1.2 Scope. ........................................................................................................................1
1.3 Application guidance.................................................................................................1
1.4 Version interoperability.............................................................................................1
1.5 Clarification of examples. .........................................................................................1
2 APPLICABLE DOCUMENTS ...........................................................................................2
2.1 General. .....................................................................................................................2
2.2 Government documents.............................................................................................2
2.2.1 Specifications, standards, and handbooks. ................................................................2
2.2.2 Other Government documents, drawings, and publications......................................2
2.3 Non-Government publications. .................................................................................3
2.3.1 International Organization for Standardization (ISO)...............................................3
2.3.2 International Telecommunications Union (ITU).......................................................3
2.3.3 Internet Engineering Task Force (IETF) standards...................................................3
2.3.4 Other..........................................................................................................................4
2.4 Order of precedence. .................................................................................................4
3 DEFINITIONS.....................................................................................................................5
3.1 Definitions of terms...................................................................................................5
3.2 Abbreviations and acronyms.....................................................................................8
4 GENERAL REQUIREMENTS .........................................................................................14
4.1 Digital message transfer device (DTMD). ..............................................................14
4.2 Interoperability. .......................................................................................................14
4.3 Framework...............................................................................................................15
4.4 DMTD capabilities..................................................................................................16
4.5 System standards and design...................................................................................17
5 DETAILED REQUIREMENTS........................................................................................18
5.1 Physical layer. .........................................................................................................18
5.1.1 Transmission channel interfaces. ............................................................................18
5.2 Physical-layer protocol............................................................................................18
5.2.1 Physical-layer Protocol Data Unit (PDU). ..............................................................18
5.2.1.1 Communications security preamble and postamble................................................19
5.2.1.2 Phasing. .................................................................................................................19
5.2.1.3 Transmission synchronization field.........................................................................19
5.2.1.4 Data field. ................................................................................................................24
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5.2.1.5 Bit synchronization field. ........................................................................................25
5.2.2 Network Access Control (NAC) related indications...............................................25
5.2.3 Physical-layer to upper-layer interactions...............................................................25
5.3 Data Link layer........................................................................................................27
5.3.1 Transmission Header...............................................................................................27
5.3.1.1 Selection bits. ..........................................................................................................27
5.3.1.2 MIL-STD-188-220 Version. ...................................................................................28
5.3.1.3 Transmission Queue field........................................................................................28
5.3.2 Network access control. ..........................................................................................30
5.3.2.1 Scheduler.................................................................................................................31
5.3.3 Types of operation...................................................................................................31
5.3.3.1 Type 1 operation......................................................................................................31
5.3.3.2 Type 2 operation......................................................................................................31
5.3.3.3 Type 3 operation......................................................................................................32
5.3.3.4 Type 4 operation......................................................................................................32
5.3.3.5 Station class.............................................................................................................32
5.3.4 Data Link frame.......................................................................................................32
5.3.4.1 Types of frames. ......................................................................................................32
5.3.4.2 Data Link frame structure........................................................................................32
5.3.4.3 Data Link PDU construction. ..................................................................................50
5.3.5 Operational parameters............................................................................................51
5.3.5.1 Type 1 operational parameters. ...............................................................................51
5.3.5.2 Type 2 operational parameters. ...............................................................................51
5.3.5.3 Type 3 operational parameters. ...............................................................................53
5.3.5.4 Type 4 operational parameters. ...............................................................................54
5.3.6 Commands and responses. ......................................................................................54
5.3.6.1 Type 1 operation commands and indications..........................................................55
5.3.6.2 Type 2 operation commands and responses............................................................56
5.3.6.3 Type 3 operation commands and responses............................................................62
5.3.6.4 Type 4 operation commands and responses............................................................63
5.3.7 Description of procedures by type...........................................................................65
5.3.7.1 Description of Type 1 procedures. ..........................................................................65
5.3.7.2 Description of Type 2 procedures. ..........................................................................67
5.3.7.3 Description of Type 3 procedures. ..........................................................................77
5.3.7.4 Description of Type 4 procedures. ..........................................................................79
5.3.8 Data Link initialization............................................................................................81
5.3.8.1 List of Data Link parameters...................................................................................82
5.3.9 Frame transfer..........................................................................................................85
5.3.9.1 PDU transmission....................................................................................................85
5.3.9.2 Data Link concatenation..........................................................................................86
5.3.9.3 Physical Layer (PL) concatenation. ........................................................................86
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5.3.9.4 PDU transmissions. .................................................................................................88
5.3.10 Flow control. ...........................................................................................................88
5.3.10.1 Type 1 flow control. ................................................................................................88
5.3.10.2 Type 2 flow control. ................................................................................................88
5.3.10.3 Type 3 flow control. ................................................................................................88
5.3.10.4 Type 4 flow control. ................................................................................................88
5.3.11 Acknowledgment and response...............................................................................89
5.3.11.1 Acknowledgment.....................................................................................................89
5.3.11.2 Quiet Mode..............................................................................................................89
5.3.11.3 Immediate retransmission........................................................................................90
5.3.12 Invalid frame. ..........................................................................................................90
5.3.13 Retransmission. .......................................................................................................90
5.3.14 Error Detection and Correction (EDC). ..................................................................91
5.3.14.1 Forward-Error-Correction (FEC) coding. ...............................................................91
5.3.14.2 Forward-Error-Correction preprocessing................................................................91
5.3.14.3 Time-Dispersive Coding (TDC)..............................................................................91
5.3.15 Data scrambling.......................................................................................................93
5.3.16 Data Link Layer interactions...................................................................................96
5.4 Network Layer.......................................................................................................100
5.4.1 Intranet Protocol....................................................................................................100
5.4.1.1 Intranet Header......................................................................................................100
5.4.1.2 Topology Update...................................................................................................110
5.4.1.3 Topology Update Request message. .....................................................................113
5.4.1.4 Forwarding of group multicast packets.................................................................113
5.4.1.5 Intranet Layer (IL) interactions.............................................................................116
5.4.2 Subnetwork Dependent Convergence Function (SNDCF). ..................................119
5.4.2.1 Determine Destination function. ...........................................................................120
5.4.2.2 Address Mapping function. ...................................................................................120
5.4.2.3 Type of Service function. ......................................................................................121
5.4.2.4 Intranet send request..............................................................................................121
5.4.3 Implementation directions.....................................................................................121
5.5 Lower layer protocol network settings..................................................................121
5.5.1 Reason for table.....................................................................................................121
5.5.2 Table description. ..................................................................................................122
5.5.2.1 Table map. .............................................................................................................122
5.5.3 Table use................................................................................................................123
5.5.4 Changing from OPS parameters............................................................................123
5.5.5 Custom OPS. .........................................................................................................123
5.5.6 Requirements prior to new OPS code insertions...................................................123
5.5.6.1 Values. ...............................................................................................................125
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6 NOTES.............................................................................................................................133
6.1 Subject term (key word) listing.............................................................................133
6.2 Issue of the DoD index of specifications and standards........................................133
6.3 Interoperability considerations..............................................................................133
6.3.1 Transmission channel............................................................................................134
6.3.2 Physical interface. .................................................................................................134
6.3.2.1 SINCGARS System Improvement Program (SIP) Receiver/Transmitter (R/T)
interface. ...............................................................................................................134
6.3.2.2 SINCGARS Integrated COMSEC (ICOM) R/T interface. ...................................136
6.3.2.3 HAVEQUICK II R/T interface. ............................................................................137
6.3.2.4 COMSEC interoperability.....................................................................................137
6.3.3 Data Link Layer.....................................................................................................138
6.3.3.1 Frequency of Access Ranking (FOAR).................................................................138
6.3.3.2 Generation of unique six octet Data Link Layer address for IPv6........................139
6.3.4 Intranet Layer. .......................................................................................................140
6.3.4.1 Allocation of memory required for reassembly. ...................................................142
6.3.4.2 Deallocation of memory used for reassembly.......................................................142
6.3.5 CNR Management process using XNP. ................................................................142
6.3.6 Interoperation with Internet Protocols...................................................................142
6.4 Changes from previous issue.................................................................................143
 APPENDIX A ABBREVIATIONS AND ACRONYMS ...............................................144
A.1 General. .................................................................................................................144
A.1.1 Scope. ....................................................................................................................144
 APPENDIX B DOD STANDARDIZED PROFILE IMPLEMENTATION
 CONFORMANCE STATEMENTS (DSPICS) REQUIREMENTS LIST (DPRL)........145
B.1 General. .................................................................................................................145
B.1.1 Scope. ....................................................................................................................146
B.1.2 Application. ...........................................................................................................146
B.2 Applicable documents. ..........................................................................................147
B.3 Notation.................................................................................................................147
B.4 Implementation requirements................................................................................148
B.5 Detailed requirements............................................................................................148
 ANNEX A........................................................................................................................149
A.1 MIL-STD-188-220D Profile Protocol Stack.........................................................149
A.2 Implementation Identification. ..............................................................................149
A.2.1 Protocol Summary.................................................................................................149
A.3 CNR Requirements List. .......................................................................................150
A.3.1 Basic Requirements...............................................................................................150
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A.4 Physical Layer DPRL............................................................................................150
A.4.1 Transmission Channel Interfaces. .........................................................................150
A.4.2 Physical Layer Protocol.........................................................................................151
A.5 Data Link Layer DPRL. ........................................................................................156
A.5.1 Transmission Header.............................................................................................157
A.5.2 Net Access Control (NAC)....................................................................................159
A.5.3 Types of Procedures. .............................................................................................160
A.5.4 Data Link Frame....................................................................................................161
A.5.5 Operational Parameters. ........................................................................................174
A.5.6 Commands and Responses. ...................................................................................179
A.5.7 Description of Procedures by Type.......................................................................193
A.5.8 Data Link Initialization. ........................................................................................224
A.5.9 Frame Transfer. .....................................................................................................231
A.5.10 Flow Control..........................................................................................................233
A.5.11 Acknowledgment and Response. ..........................................................................233
A.5.12 Invalid Frame. .......................................................................................................235
A.5.13 Retransmission. .....................................................................................................236
A.5.14 Error Detection and Correction. ............................................................................236
A.5.15 Data Scrambling....................................................................................................239
A.5.16 Data Link Layer Interactions.................................................................................240
A.6 Network Layer DPRL. ..........................................................................................241
A.6.1 Intranet Protocol....................................................................................................241
A.6.2 Subnetwork Dependent Convergence Function (SNDCF). ..................................259
A.6.3 Standard network settings. ....................................................................................260
A.7 Appendixes............................................................................................................260
A.7.1 This paragraph was intentionally left blank for paragraph conformity.................261
A.7.2 Network Access Control Algorithm (NAC)..........................................................261
A.7.3 Communications Security Standards.....................................................................280
A.7.4 CNR Management Processes using XNP..............................................................284
A.7.5 Golay Coding Algorithm.......................................................................................306
A.7.6 Packet Construction and Bit Ordering. .................................................................307
A.7.7 Intranet Topology Update. ....................................................................................308
A.7.8 Source Directed Relay...........................................................................................309
A.7.9 Robust Communications Protocol.........................................................................311
A.7.10 Bose-Chaudhuri-Hocquenghem (15, 7) Coding Algorithm..................................321
A.7.11 Transmission Channel Interfaces. .........................................................................321
 APPENDIX C NETWORK ACCESS CONTROL ALGORITHM ................................327
C.1 General. .................................................................................................................327
C.1.1 Scope. ....................................................................................................................327
C.1.2 Application. ...........................................................................................................327
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C.2 Applicable documents. ..........................................................................................327
C.3 Network Timing Model.........................................................................................327
C.3.1 Network Timing Model definitions.......................................................................327
C.3.2 Network Timing Model parameters. .....................................................................328
C.3.2.1 Equipment Preamble Time (EPRE).......................................................................328
C.3.2.2 Phasing Transmission Time (PHASING). ............................................................330
C.3.2.3 Data Transmission Time (DATA).........................................................................330
C.3.2.4 Coupled Acknowledgment Transmission Time (S). .............................................330
C.3.2.5 Equipment Lag Time (ELAG)...............................................................................331
C.3.2.6 Turnaround Time (TURN). ...................................................................................331
C.3.2.7 DTE ACK Preparation Time (DTEACK). ............................................................332
C.3.2.8 DTE Processing Time (DTEPROC)......................................................................332
C.3.2.9 DTE Turnaround Time (DTETURN)....................................................................333
C.3.2.10 Tolerance Time (TOL). .........................................................................................333
C.3.2.11 Maximum Transmit Time (MTT). ........................................................................333
C.4 Network Access Control. ......................................................................................333
C.4.1 Network Busy Sensing function............................................................................333
C.4.1.1 Data Network Busy Sensing..................................................................................333
C.4.1.2 Voice Network Busy Sensing................................................................................334
C.4.1.3 Network Busy Detect Time...................................................................................334
C.4.2 Response Hold Delay. ...........................................................................................334
C.4.3 Timeout Period. .....................................................................................................335
C.4.4 Network Access Delay (NAD). ............................................................................337
C.4.4.1 Random - Network Access Delay (R-NAD).........................................................339
C.4.4.2 Prioritized - Network Access Delay (P-NAD)......................................................339
C.4.4.3 Hybrid - Network Access Delay (H-NAD)...........................................................339
C.4.4.4 Radio Embedded - Network Access Delay (RE-NAD). .......................................341
C.4.4.5 Deterministic Adaptable Priority - Network Access Delay (DAP-NAD).............348
C.4.4.6 Data and Voice - Network Access Delay (DAV-NAD)........................................358
C.4.5 Voice/data network sharing...................................................................................364
 APPENDIX D COMMUNICATIONS SECURITY STANDARDS ..............................366
D.1 General. .................................................................................................................366
D.1.1 Scope. ....................................................................................................................366
D.1.2 Application. ...........................................................................................................366
D.1.3 Interoperability. .....................................................................................................366
D.2 Applicable Documents. .........................................................................................366
D.3 Definitions.............................................................................................................366
D.4 General requirements. ...........................................................................................366
D.5 Detailed requirements............................................................................................367
D.5.1 Traditional COMSEC transmission frame. ...........................................................367
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D.5.1.1 COMSEC preamble field. .....................................................................................367
D.5.1.2 Phasing. ...............................................................................................................368
D.5.1.3 Transmission synchronization field.......................................................................369
D.5.1.4 Data field. ..............................................................................................................369
D.5.1.5 COMSEC postamble field.....................................................................................369
D.5.1.6 COMSEC algorithm. .............................................................................................369
D.5.1.7 COMSEC modes of operation...............................................................................369
D.5.2 Embedded COMSEC transmission frame.............................................................369
D.5.2.1 Phasing. ...............................................................................................................370
D.5.2.2 Frame Synchronization subfield............................................................................370
D.5.2.3 Robust Frame Format subfield. .............................................................................370
D.5.2.4 Message Indicator field. ........................................................................................370
D.5.2.5 Transmission Word Count subfield.......................................................................370
D.5.2.6 Data Field. .............................................................................................................370
D.5.2.7 COMSEC Postamble field.....................................................................................370
D.5.2.8 COMSEC algorithm. .............................................................................................370
D.5.2.9 COMSEC modes of operation...............................................................................371
 APPENDIX E CNR MANAGEMENT PROCESSES USING XNP ..............................372
E.1 General. .................................................................................................................372
E.1.1 Scope. ....................................................................................................................372
E.1.2 Application. ...........................................................................................................372
E.1.3 Clarification of examples ......................................................................................372
E.2 Applicable documents. ..........................................................................................372
E.3 Network configuration. .........................................................................................373
E.3.1 Network Control Station. ......................................................................................373
E.3.1.1 NCS mode. ............................................................................................................373
E.3.2 Dynamic and Static stations. .................................................................................374
E.3.3 IPv4/v6 address assignment and resolution. .........................................................374
E.3.4 Multicast address assignment................................................................................375
E.4 Exchange Network Parameters (XNP) messages..................................................375
E.4.1 XNP message structure. ........................................................................................375
E.4.1.1 Forwarding. ...........................................................................................................376
E.4.1.2 Message and data block structure..........................................................................377
E.4.2 XNP message formats. ..........................................................................................380
E.4.2.1 Join Request. .........................................................................................................380
E.4.2.2 Join Accept............................................................................................................382
E.4.2.3 Join Reject. ............................................................................................................384
E.4.2.4 Hello message........................................................................................................386
E.4.2.5 Goodbye message..................................................................................................387
E.4.2.6 Parameter Update Request message......................................................................387
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E.4.2.7 Parameter Update message....................................................................................388
E.4.2.8 Status Notification message. .................................................................................390
E.4.2.9 NCS Handover Request.........................................................................................393
E.4.2.10 NCS Handover Accept/Reject...............................................................................394
E.4.3 XNP data block formats. .......................................................................................394
E.4.3.1 Block 2, Optional Services....................................................................................394
E.4.3.2 Block 3, Basic NAD Configuration parameters....................................................396
E.4.3.3 Block 4, Type 3 parameters...................................................................................399
E.4.3.4 Block 5, Number of NAD Priorities.....................................................................399
E.4.3.5 Block 6, H-NAD parameters. ................................................................................400
E.4.3.6 Block 7, RE-NAD parameters...............................................................................401
E.4.3.7 Block 8, Wait time.................................................................................................402
E.4.3.8 Block 9, Type 2 parameters...................................................................................403
E.4.3.9 Block 10, Type 4 parameters.................................................................................404
E.4.3.10 Block 11, NAD ranking.........................................................................................405
E.4.3.11 Block 12, Intranet parameters. ..............................................................................406
E.4.3.12 Block 13, Error......................................................................................................408
E.4.3.13 Block 14, Address designation parameters. ..........................................................409
E.4.3.14 Block 15, Digital Signature...................................................................................411
E.4.3.15 Block 16, Link Address Extension........................................................................411
E.4.3.16 Block 17, XNP Parameters....................................................................................412
E.4.3.17 Block 18, Robust parameters.................................................................................413
E.4.3.18 Block 19, IPv6 top level/site level address. ..........................................................414
E.4.3.19 Block 20, Predefined OPS.....................................................................................414
E.4.3.20 Block 21, S/R basic. ..............................................................................................416
E.5 XNP message exchange. .......................................................................................417
E.5.1 Data Link addressing.............................................................................................417
E.5.2 Poll/Final bit..........................................................................................................418
E.5.3 Network Access.....................................................................................................418
E.6 Network joining procedures. .................................................................................418
E.6.1 Basic joining..........................................................................................................418
E.6.2 Basic join using unicast addressing.......................................................................420
E.6.3 Join and election of a NCS....................................................................................421
E.6.4 Basic Leaving........................................................................................................422
E.6.5 Leaving without sending Goodbye........................................................................423
E.7 Example Messages ................................................................................................424
E.7.1 Join Request Message ...........................................................................................424
E.7.2 Join Accept message. ............................................................................................426
 APPENDIX F GOLAY CODING ALGORITHM ..........................................................434
F.1 General. .................................................................................................................434
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F.1.1 Scope. ....................................................................................................................434
F.1.2 Application. ...........................................................................................................434
F.2 Applicable documents. ..........................................................................................434
F.3 Forward Error Correction......................................................................................434
F.4 Golay code.............................................................................................................434
F.4.1 Half-rate Golay code. ............................................................................................434
F.4.2 Golay code implementation...................................................................................434
F.4.2.1 Hardware implementation. ....................................................................................435
F.4.2.2 Hardware decoding................................................................................................435
F.4.2.3 Software implementation. .....................................................................................437
 APPENDIX G PACKET CONSTRUCTION AND BIT ORDERING...........................440
G.1 General. .................................................................................................................440
G.1.1 Scope. ....................................................................................................................440
G.1.2 Application. ...........................................................................................................440
G.1.3 Clarification of examples ......................................................................................440
G.2 Applicable documents. ..........................................................................................440
G.3 PDU construction. .................................................................................................440
G.3.1 VMF message data exchange................................................................................442
G.3.1.1 Example of VMF message data construction........................................................443
G.3.2 Application Layer data exchange..........................................................................446
G.3.2.1 Example of Application Layer PDU. ....................................................................447
G.3.3 Transport Layer data exchange. ............................................................................454
G.3.3.1 An example of Segmentation / Reassembly (S/R) Data Segment construction....454
G.3.3.2 An example of UDP header construction..............................................................458
G.3.4 Network Layer data exchange...............................................................................461
G.3.4.1 Example of Internet Layer header.........................................................................462
G.3.4.2 Example of Intranet Layer header.........................................................................464
G.3.5 This paragraph was intentionally deleted and left blank for paragraph
conformity.........................................................................................................466
G.3.6 Data Link Layer data exchange.............................................................................466
G.3.6.1 Example of Data Link Layer PDU. .......................................................................468
G.3.7 Physical Layer data exchange. ..............................................................................476
G.3.7.1 Physical Layer processing example. .....................................................................476
 APPENDIX H INTRANET TOPOLOGY UPDATE......................................................478
H.1 General. .................................................................................................................478
H.1.1 Scope. ....................................................................................................................478
H.1.2 Application. ...........................................................................................................478
H.2 Applicable documents. ..........................................................................................478
H.3 Problem overview..................................................................................................478
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H.3.1 Routing trees..........................................................................................................479
H.4 Topology Updates. ................................................................................................479
H.4.1 Exchanging routing trees.......................................................................................479
H.4.2 Topology tables. ....................................................................................................480
H.4.3 Sparse routing trees. ..............................................................................................481
H.4.4 Rules for exchanging Topology Updates. .............................................................482
H.4.4.1 Topology Update triggers......................................................................................483
H.4.4.2 Sending Topology Update messages.....................................................................484
H.4.4.3 Sending Topology Update ID indication PDUs....................................................484
H.4.5 Non-relayers. .........................................................................................................484
H.4.6 Quiet nodes............................................................................................................484
H.4.7 Topology Update Request messages.....................................................................484
 APPENDIX I SOURCE DIRECTED RELAY................................................................486
I.1 General. .................................................................................................................486
I.1.1 Scope. ....................................................................................................................486
I.1.2 Application. ...........................................................................................................486
I.1.3 Clarification of examples ......................................................................................486
I.2 Applicable documents. ..........................................................................................486
I.3 Problem overview..................................................................................................486
I.4 Procedure...............................................................................................................486
I.4.1 Forward routing.....................................................................................................486
I.4.2 End-to-End intranet acknowledgments. ................................................................487
I.5 Examples. ..............................................................................................................487
I.5.1 Example 1..............................................................................................................489
I.5.2 Example 2..............................................................................................................490
I.5.3 Example 3..............................................................................................................492
I.5.4 Relay processing....................................................................................................493
I.5.4.1 Relay processing at node C. ..................................................................................495
I.5.4.2 Relay processing at node F....................................................................................495
 APPENDIX J ROBUST COMMUNICATIONS PROTOCOL ......................................498
J.1 General. .................................................................................................................498
J.1.1 Scope. ....................................................................................................................498
J.1.2 Application. ...........................................................................................................498
J.2 Applicable documents. ..........................................................................................498
J.3 Introduction. ..........................................................................................................498
J.3.1 Physical protocol components...............................................................................498
J.3.2 Optional rate 1/3 convolutional coding.................................................................499
J.3.3 Optional data scrambling.......................................................................................500
J.3.4 Optional robust multi-dwell. .................................................................................501
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J.3.4.1 Multi-dwell packet format.....................................................................................501
J.3.4.2 Multi-dwell SOP field. ..........................................................................................502
J.3.4.3 Multi-dwell segment count field. ..........................................................................502
J.3.4.4 Multi-dwell data segments. ...................................................................................503
J.3.4.5 Multi-dwell hop detection. ....................................................................................503
J.3.4.6 Multi-dwell transmit processing............................................................................503
J.3.4.7 Multi-dwell receive processing. ............................................................................505
J.3.4.8 Multi-dwell majority logic overhead choice. ........................................................505
J.3.4.9 Multi-dwell overhead. ...........................................................................................506
J.3.5 Robust Communications Protocol network timing. ..............................................506
J.3.5.1 Net Busy Sensing. .................................................................................................507
J.3.5.2 Response hold delay..............................................................................................507
J.3.5.3 Timeout Period (TP)..............................................................................................512
J.3.5.4 NAD. ...............................................................................................................512
J.3.6 Application guidance for the HAVEQUICK II link. ............................................512
J.3.6.1 Frequency hop synchronization.............................................................................512
J.3.7 Summary................................................................................................................512
J.4 PDU construction. .................................................................................................513
J.4.1 Robust PDU header. ..............................................................................................513
J.4.2 User Data...............................................................................................................513
J.4.3 Multi-dwell flag set. ..............................................................................................513
J.4.4 Multi-dwell flag not set. ........................................................................................523
 APPENDIX K BOSE - CHAUDHURI - HOCQUENGHEM (15,7) CODING
 ALGORITHM..................................................................................................................529
K.1 General. .................................................................................................................529
K.1.1 Scope. ....................................................................................................................529
K.1.2 Application. ...........................................................................................................529
K.2 Applicable documents. ..........................................................................................529
K.3 BCH (15,7) code....................................................................................................529
K.3.1 Hardware encoding................................................................................................529
K.3.2 Hardware/Software decoding................................................................................534
K.3.3 Software encoding.................................................................................................535
 APPENDIX L TRANSMISSION CHANNEL INTERFACES.......................................538
L.1 General. .................................................................................................................538
L.1.1 Scope. ....................................................................................................................538
L.1.2 Application. ...........................................................................................................538
L.2 Applicable documents. ..........................................................................................538
L.3 Definitions.............................................................................................................538
L.4 Detailed requirements............................................................................................538
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MIL-STD-188-220D w/ Change 1
CONTENTS
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L.4.1 Transmission Channel Interfaces. .........................................................................538
L.4.1.1 Non-Return-to-Zero (NRZ) interface....................................................................539
L.4.1.2 Frequency-Shift Keying (FSK) interface for voice frequency channels...............539
L.4.1.3 Frequency-Shift Keying (FSK) interface for single-channel radio.......................540
L.4.1.4 Conditioned Diphase (CDP) interface...................................................................540
L.4.1.5 Differential Phase-Shift Keying (DPSK) interface for voice frequency
channels. ...............................................................................................................540
L.4.1.6 Packet mode interface. ..........................................................................................541
L.4.1.7 Amplitude Shift Keying (ASK) interface..............................................................541