MIL-STD-188-110C
1. SCOPE
1.1 Scope.
This document establishes mandatory technical standards and design objectives (DO) that are
necessary to ensure interoperability and to promote performance among data modulators-
demodulators (modems) used in the voice frequency (VF) band of long-haul and tactical
communications systems. This document also provides guidance to the designers of new data
modems that incorporate characteristics not yet standardized by specifying the technical
characteristics of data modems currently in the inventory. The purpose of this guidance is to
ensure attainment of minimum acceptable performance and maximum interoperability between
existing and future data modems with specified transmission channel conditions.
1.2 Applicability.
These standards are mandatory within the Department of Defense (DoD) in the design,
development and engineering of new communications facilities for both narrowband and
wideband long-haul and tactical systems. In some cases, reference is made to other documents
that provide standards for specific applications. It is not intended that existing systems be
immediately converted to comply with the requirements of these standards. New systems, and
those undergoing major modification or rehabilitation, conformance to these standards is subject
to current procurement regulations. This document is applicable to the design and development
of new data modems with standard data signaling rates up to and including 120,000 bits per
second (bps) used in long-haul and tactical communications systems. This document is not
applicable to high frequency (HF) data modems used in the Tactical Digital Information Link
(TADIL) A. The HF data modem standards for TADIL A are published in MIL-STD-188-203-1.
1.3 Application guidance.
Requirements in this document, if applied as intended, ensure the interoperability and
performance of data modems having the same or similar functions. The variety of data modems
is limited to that which are essential to effectively support the missions of the military forces. It
is not intended that the standards contained in this document inhibit advances in communications
technology. Such advances are encouraged by including DOs that should be used if economically
feasible. Additionally, standardizing parameter values but not the technology that may be used to
meet these parameter values facilitates such advances. Minimum performance requirements for
the high frequency (HF) serial (single-tone) modem waveforms are specified in Table XVI and
Appendices B, C, D, and F. The specified values shown represent HF modem performance under
ideal test conditions. To identify the minimum acceptable performance available to users, many
factors, including operational test and evaluation must be considered.
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