MIL-STD-1397 standard was issued by the

United States Department of Defense The United States Department of Defense (DoD, USDOD or DOD) is an executive branch department of the federal government charged with coordinating and supervising all agencies and functions of the government directly related to national secu ...

(DoD) to define "the requirements for the physical, functional and electrical characteristics of a standard I/O data interface for

digital data Digital data, in information theory and information systems, is information represented as a string of discrete symbols each of which can take on one of only a finite number of values from some alphabet, such as letters or digits. An example i ...

." The MIL-STD-1397 classification types A, B and D apply specifically to the

Naval Tactical Data System Naval Tactical Data System (NTDS) was a computerized information processing system developed by the United States Navy in the 1950s and first deployed in the early 1960s for use in combat ships. It took reports from multiple sensors on different sh ...

(NTDS).

Overview

Types

MIL-STD-1397 defines several 'Types' (A to K) MIL-STD-1397C(SH) document 1 June 1995 * Type A (NTDS Slow)- Parallel data transfer of up to 41667 words per second on one cable. * Type B (NTDS Fast) - Parallel data transfer of up to 250000 words per second on one cable. * Type C (ANEW) - Parallel data transfer of up to 250000 words per second on one cable. * Type D (NTDS Serial) - Asynchronous serial data transfer using 10 Mbit/s data rate. * Type E (NATO Serial) - Asynchronous serial data transfer at 10Mbit/s, with 300000 words/sec in burst mode, or 175000 words/sec in single transfer mode. Type E is derived from

STANAG 4153 In NATO, a standardization agreement (STANAG, redundantly: STANAG agreement) defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the alliance. Each NATO st ...

. Type E uses Bi-Phase Modulation anchester II phase encoding The impedance is 50 ohms + 5 ohms, a 50 ohm Triaxial cable is defined enter conductor is the signal, the other two are shields MIL-C-17/134 cable is used for lengths up to 120 meters, MIL-C-17/135 is used for cable lengths up to 300 meters. The connectors are defined by MIL-C-49142 /01 and /02. * Type F -

MIL-STD-1553 MIL-STD-1553 is a military standard published by the United States Department of Defense that defines the mechanical, electrical, and functional characteristics of a serial data bus. It was originally designed as an avionic data bus for use with ...

aircraft Manchester Byphase multiplex serial bus, 1 Mbit/s data rate. * Type G (RS-449 compatible with RS-232) - uses EIA449 /

EIA232 In telecommunications, RS-232 or Recommended Standard 232 is a standard originally introduced in 1960 for serial communication transmission of data. It formally defines signals connecting between a ''DTE'' (''data terminal equipment'') such a ...

implementation. * Type H (High Speed) - Parallel data transfer of up to 500,000 words per second on one cable. * Type I - Not specified. * Type J - Optical version * Type K (SCSI) - Based on

SCSI-2 Parallel SCSI (formally, SCSI Parallel Interface, or SPI) is the earliest of the interface implementations in the SCSI family. SPI is a parallel bus; there is one set of electrical connections stretching from one end of the SCSI bus to the othe ...

.MIL-STD-1397 Bus Description
(Retrieved 28 July 2010)

Mechanical

Type D uses BNC coaxial connectors.GET NTDS Tutorials & Discussions, http://www.getntds.com/pdf/seriald.pdf Type E uses TNC triaxial connectors.

Electrical Signalling

* Type A - Binary voltage levels of 0 VDC (logic 1) and -15 VDC (logic 0) * Type B - Binary voltage levels of 0 VDC (logic 1) and -3 VDC (logic 0) * Type C - Binary voltage levels of 0 VDC (logic 1) and +3.5 VDC (logic 0) * Type D - Bipolar +/- 3.25 VDC nominal * Type E - Bipolar +/- 600mv * Type F - * Type G - * Type H - * Type I - Not specified. * Type J -

References

* Military Standard, Input/Output Interfaces, Standard Digital Data, Navy Systems (MIL-STD-1397B), 3 March 1989

External links

MIL-STD-1397 and NTDS
(Retrieved 14 October 2009) Military of the United States standards