scope:

This standard establishes the requirements for the physical, functional, and electrical characteristics of a standard I/O interface for digital data.

The digital data interfaces specified herein are classified as follows:

a. Type A (Naval Tactical Data System (NTDS) slow)). Parallel data transfer of up to 41,667 words per second on one cable. Binary voltage levels of 0 volt direct current (Vdc) (logical 1) and −15 Vdc (logical 0).

b. Type B (NTDS fast). Parallel data transfer of up to 250,000 words per second on one cable. Binary voltage levels of 0 Vdc (logical 1) and −3 Vdc (logical 0).

c. Type C (ANEW). Parallel data transfer of up to 250,000 words per second on one cable. Binary voltage levels of 0 Vdc (logical 1) and +3.5 Vdc (logical 0).

d. Type D (NTDS serial) interface. Asynchronous serial data transfer using a 10 megabit per second (Mb/s) data rate. Bipolar ±3.25 volts nominal.

e. Type E (NATO serial) interface. Asynchronous serial data transfer using a 10 megabit per second (Mb/s) data rate. Bipolar ±600 mV nominal. Serial data transfer of up to 300,000 words per second in burst transfer mode and 175,000 words per second in single word transfer mode on a 100 foot cable.

f. Type F (aircraft internal time division multiplex bus). MIL-STD-1553B implementation within Navy computers systems.

g. Type G (RS-449 compatible with RS-232). RS-449/RS-232 implementation within Navy computers.

h. Type H (high throughput parallel). Parallel data transfer up to 500,000 words per second on one cable. Binary voltage levels of 0 Vdc (logical 1) and +3.5 Vdc (logical 0).

i. Type J (fiber optic NATO serial). Fiber optic implementation of Type E using four optical fibers.

j. Type K (Small Computer System Interface (SCSI)). Bus interface based on the ANSI X3.131-rev 10h Small Computer System Interface-2 (SCSI-II) standard.