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MIL-S-29354 Revision B, January 27, 1986
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Includes all amendments and changes through Cancellation Notice 3, September 28, 2015
Additional Comments: CNCL NO S/S
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This specification covers a family of telephone switchboards which shall provide semi- and fully-automatic switching of local and distant calls on 2-wire and 2- and 6-wire lines and 2-, 4-, and 6-wire trunks utilizing space division switching matrices. Facilities shall be provided for interfacing with automatic central offices over 4-wire tone signaling trunks, 2-wire direct current (DC) closure trunks, and 6-wire recEive and transMit (E&M) trunks. The switchboard shall be configured so that it is convertible by means of modules plugged into a universally equipped housing to handle a variety of 2-, 4-, and 6-wire lines and trunks. The universally equipped housing shall be designated as switchboard housing SB-3614/TT. Modularly pluggable printed circuit boards (PCB) shall be as follows:

(a) 20-hertz (Hz) Ringdown Line/Trunk and Common Battery Supervision (CBS) Line (Type I PCB)

(b) Common Battery (CB) Dial Pulse, Dual-Tone Multi-frequency (DTMF) Line (Type II PCB).

(c) 4-wire Tone-Signaling Trunk (Type III PCB).

(d) 6-wire E&M Signaling Line/Trunk (Type IV PCB)

(e) DC Closure Trunk (Type V PCB) Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commandant of the Marine Corps, Headquarters, U.S. Marine Corps (Code LMA-1, Washington, D. C. 20380 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.