MIL-STD-1397 standard was issued by the United States Department of Defense

United States Department of Defense

The United States Department of Defense is the U.S...

 (DoD) to define "the requirements for the physical, functional and electrical characteristics of a standard I/O data interface for digital data." The MIL-STD-1397 classification types A, B and D apply specifically to the Naval Tactical Data System

Naval Tactical Data System

Naval Tactical Data System, commonly NTDS, refers to 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.- Reason for development :...

 (NTDS).

Types

MIL-STD-1397 defines several 'Types' (A to K)

• Type A (NTDS Slow)- Parallel data transfer of up to 41667 words per second on one cable. Binary voltage levels of 0 VDC (logic 1) and -15 VDC (logic 0)
• Type B (NTDS Fast) - Parallel data transfer of up to 250000 words per second on one cable. Binary voltage levels of 0 VDC (logic 1) and -3 VDC (logic 0)
• Type C (ANEW) - Parallel data transfer of up to 41667 words per second on one cable. Binary voltage levels of 0 VDC (logic 1) and +3.5 VDC (logic 0)
• Type D (NTDS Serial) - Asynchronous serial data transfer using 10 Mb/s data rate. Bipolar +/- 3.25 VDC nominal
• Type E -
• Type F -
• Type G -
• Type H - Is a switchable version of a Type B/C Circuit Card
• Type I -
• Type J - Optical version
• Type K (SCSI) - Based on SCSI-2.

External links

• MIL-STD-1397 and NTDS (Retrieved 14 October 2009)