MIL-STD-1397 NTDS Bus, Naval Tactical Data System Buses

MIL-STD-1397 Bus

Input / Output Interfaces, Standard Digital Data, Navy Systems
NTDS Naval Tactical Data System

[MIL-STD-1397 Description] [OnLine Standards ]
[MIL-1553 Interface ICs ] [MIL-1553 Connectors ]
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[OEM MIL-STD-1397 Cards ]
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MIL-STD-1397 Bus Description

Type A {NTDS Slow} transfers data at 41667 words/sec between 0v [logical 1] and -15v [logical 0]. The switching threshold is -6.0 + 1.5Vdc. Type A uses parallel data transfers. A single ended amplifier is used which sinks less then 4mA and sources less then 1mA. A binary one may be represented by a voltage between -1.5v and +1.5vdc. A binary zero is represented by a voltage of between -10.0v and -17.5Vdc.
Type B {NTDS Fast} transfers data at 250000 words/sec between 0v [logical 1] and -3v [logical 0]. The switching threshold is -1.5 + 0.4Vdc. Input impedance is rated at 150 to 180 ohms. A binary one may be represented by a voltage between -0.0v and -0.5vdc. A binary zero is represented by a voltage of between -3.0v and -4.5Vdc.
Type C {ANEW} transfers data at 250000 words/sec between 0v [logical 1] and +3.5v [logical 0]. Type C uses a Differential amplifier.
Type D {NTDS Serial} Asynchronous serial data transfer at 10Mbps using bipolar +/- 3.25v. Type D NTDS uses RG-12A coaxial cable [MIL-C-17]
Type E {NATO Serial} Asynchronous serial data transfer at 10Mbps using bipolar +/- 600mv, with 300000 words/sec in burst mode, or 175000 words/sec in single transfer mode. Type E is derived from STANAG 4153. Type E uses Bi-Phase Modulation [Manchester II phase encoding]. The impedance is 50 ohms + 5 ohms, a 50 ohm Triaxial cable is defined [center 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 [note below]
Type F {Aircraft internal time division multiplex bus} uses MIL-STD 1553 as the interface.
Type G {RS-449 compatible with RS-232} uses EIA449 / EIA232 implementation.
Type H {High throughput parallel} uses parallel data transfers at 500000 words/sec at 0v [logical 1] and +3.5v [logical 0].
Type J {Fiber optic NATO serial} uses a fiber optic Implementation of type E. Type J differs from Type E by the physical interface, the Framing, Protocol, and Modulation. Optical fiber to MIL-F-49291/6 [62.5/125um], and optical cable to MIL-C-85045 operating to a maximum distance of 300 meters.
Type K {Small Computer System Interface SCSI} uses a bus based on the SCSI-II differential standard.

MIL-STD-1397 defines the interface characteristics; the physical, functional, and electrical requirements.
Grounding for Types A, B, C, and H are per DOD-STD-1399: Interface Standard for Shipboard Systems, Section 406 Digital Computer Grounding. Type D uses section 5.3.9.1 of MIL-STD-1397. Type K uses 5.8.2.6.3.7 of MIL-STD-1397.

NOTE; I can not find either the MIL-C-49142/01 or MIL-C-49142/02 specification, they may have been cancelled.
NOTE; Many MIL-C-85045 cable specs have been cancelled, try MIL-PRF-85045 [however the slash number is not provided here].
NOTE; Many MIL-F-49291 documents are still active, however the slash number is not provided here.

MIL-1397 Interface ICs

MIL-STD-1553 interface IC manufacturers, for other interface types listed above refer to those interface bus pages [if provided].

Aeroflex {Mil 1553 Controller/Transceiver ICs}

Data Device Corp. {Mil-STD-1553 ICs}

Holt Integrated Circuits Inc.

National Hybrid Inc.

5962-88584; Quad NTDS Fast [type B]/ ANEW [type C] receiver.

IC Manufacturers {All other circuit types}

MIL-STD-1397 Standard/Specifications

MIL-STD-1397C - Input/Output Interfaces, Standards Digital data, Navy Systems
MIL-STD-1553 ~ [Military-Standard-1553b] Interface Standard for Digital Time Division Command/Response Multiplex Data Bus
MIL-STD-1773 - Fiber Optics mechanization of an Aircraft Internal Time Division Command/response Multiplex Data Bus
MIL-HDBK-1553A - Multiplex Applications Handbook

MIL-STD-1760C - Interface Standard for Aircraft/Store Electrical Interconnection System

NATO calls MIL-STD-1553B: STANAG 3838AVS;, the UK calls it DEF STAN 00-18. Now controlled by the SAE as AS15531, and re-released by NATO as STANAG 7155.
STANAG 3910; A derivation of MIL-1553 (like MIL-1773 ?) used in NATO / UK. Operates at 100Mb/s over fiber.
ARINC 629; Another derivation of MIL-1553 used by commercial aircraft. Yet another was ARINC 453.
MMSI: Miniature Mission Stores Interface. 2-wire, 10Mbps 1553 protocol transmitted using RS-485 transceiver(s).
Also called Enhanced Bit Rate 1553 (EBR-1553). MMSI / EBR

{MIL-STD-1397 Bus Index}

MIL-1397 Connector Manufacturers / Vendors

Refer above to connector types.
MlL-STD-1553B does not specify the type of connector used to interconnect cables that make up a network. Notice 2, paragraph 30.10.3, however, specifies that, for applications that use concentric connectors or inserts for each bus [Pin Out info]: the center pin of the connector or insert shall be used for the high (positive) Manchester hi-phase signal. The inner ring shall be used for the low (negative) Manchester hi-phase signal.
There are currently two types of connectors in general use.
1: a multi-pin connector that comes in various styles including circular, rectangular, and rack and panel.
2: is the discrete concentric triaxial design.

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Twinax Drawing (MIL Spec)

Adam Technologies Inc.

Amphenol

Connex

Methode Electronics, Inc.

Connector Manufacturers {All other types}

{MIL-STD-1397 Interface Bus Index}