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TM-11-5820-803-12 Modem Digital Data MD-921/G (NSN 5820-00-155-8581) Manual		Next
Table of Contents cont'd

TM 11-5820-803-12
}
TECHNICAL MANUAL
HEADQUARTERS
DEPARTMENT OF THE ARMY
No. 11-5820-803-12
WASHINGTON, DC., 7 June 1976
Operator's and Organizational Maintenance Manual
MODEM, DIGITAL DATA MD-921/G
(NSN 5820-00-155-8581)
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS
You can help improve this manual. If you find any mistakes or if you know of a way to improve the
procedures, please let us know.  Mail your letter, DA Form 2028 (Recommended Changes to
Publications and Blank Forms), or DA Form 2028-2 located in back of this manual direct to:
Commander, US Army Communications-Electronics Command and Fort Monmouth, ATTN:
AMSEL-ME-MP, Fort Monmouth, New Jersey 07703-5007.
Paragraph
Page
CHAPTER
1.
INTRODUCTION
Section I.
General
Scope ......................................................................................................................... .
1-1
1-1
Consolidated Index of Army Publications and Blank Forms ......................................
1-2
1-1
Maintenance forma. records, and reports ................................................................
1-3
1-1
Reporting Equipment Improvement Recommendations (EIR) ...................................
1-4
1-1
Administrative storage ...............................................................................................
1-5
1-1
Destruction of Army materiel ...................................................................................... .
1-5.1
1-1
II.
Description and Data
Purpose and use ........................................................................................................
1-6
1-1
Description .................................................................................................................
1-7
1-1
System application ....................................................................................................
1-8
1-3
Items comprising and operable equipment ................................................................
1-9
1-4
Tabulated data- ..........................................................................................................
1-10
1-6
CHAPTER
2.
SERVICE UPON RECEIPT AND INSTALLATION
Section I.
Systems Planning
General .....................................................................................................................
2-1
2-1
Earth terminal interface signals ..................................................................................
2-2
2-1
Earth terminal interface consideration .......................................................................
2-3
2-3
Coding/decoding options ...........................................................................................
2-4
2-4
Differential coding ......................................................................................................
2-5
2-7
Coding/decoding implementation ...............................................................................
2-6
2-8
Digital user interface- .................................................................................................
2-7
2-8
Direct digital interface ................................................................................................
2-8
2-10
ICF interface- .............................................................................................................
2-9
2-13
Test and monitor capabilities .....................................................................................
2-10
2-14
Special applications ...................................................................................................
2-11
2-16
II.
Site and Shelter Requirements
Siting ..........................................................................................................................
2-12
2-19
Shelter requirements ..................................................................................................
2-13
2-19
III.
Service Upon Receipt of Material
Unpacking ..................................................................................................................
2-14
2-19
Checking unpacked equipment ..................................................................................
2-15
2-19
IV.
Installation Instructions
Tools, test equipment, and materials required for installation . ..................................
2-16
2-20
Installation instructions ...............................................................................................
2-17
2-20
Special installations ...................................................................................................
2-18
2-20
External connections ..................................................................................................
2-19
2-20
Switch and internal control settings ...........................................................................
2-20
2-20
Circuit lineup ..............................................................................................................
2-21
2-24
Change 2 i

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