MIL-STD-188-154 Subsystem, Equipment, And Interface Standards For Common Long Haul And Tactical Telecommunications Control FacilitiesThis standard establishes physical and functional interface requirements for long haul and tactical telecommunications control facilities formerly technical control facilities in the Department of Defense DoD. As used in this standard, the term telecommunications control facility TCF includes patch and test facilities PTFs and interfaces to locations that provide centralized monitoring and control functions for other telecommunication locations.

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MIL-STD-188-154A

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5.5.1 Distribution facilities. Distribution facilities used in TCFs include traditional cross-connect wiring frames, punch blocks functioning as distribution frames or circuit concentration facilities, and automated circuit distribution access points. Distribution facilities shall be used, as required, to provide the ability to cross-connect between permanent wiring terminations. Permanent wiring shall be terminated with solderless connection techniques such as wire wrap, punch down, or connectorization. Cross-connects may be electronic, wire

wrap, solder, punch, or connectorized, but using automated circuit distribution or

quick connect/disconnect wiring is preferred. Frames are categorized by their purpose and placement in the station wiring scheme. Each of the following types may also be separated into RED and BLACK installations. The RED frame may be further subdivided by classification level.

5.5.1.1 Main distribution frame (MDF). Surge protector blocks and other required protection devices shall be located on this frame. Where equipped with vertical and horizontal terminal blocks, the left vertical side shall terminate the lines entering the facility, and the bottom horizontal side shall terminate the tie cables to the intermediate distribution frames and the circuit concentration facilities (see paragraphs 5.5.1.2 and 5.5.1.4). Cross-connects shall be made between the right vertical and top horizontal sides.

5.5.1.2 Intermediate distribution frame (IDF). IDFs are used, as required, to provide termination points for and the means of interconnecting in-house tie cables, in-station equipment, and circuit monitoring and patching facilities. The tie cable can connect the IDF to MDFs, combined distribution frames (CDF) (see paragraph 5.5.1.3), circuit concentration facilities, or other IDFs. Out-of-station connections shall not be made on an IDF. Where equipped with vertical and horizontal terminal blocks, the left vertical side shall terminate the tie cables and station equipment, and the bottom horizontal side shall terminate the circuit monitoring and patching facilities. Required battery terminations shall also be

on the bottom horizontal side. Cross-connects shall be made between the right vertical and top horizontal sides.

5.5.1.3 Combined distribution frame (CDF). A commercial POP may be present on the CDF for terminating commercial access lines. If one frame is sufficient to support mission requirements, using a CDF is preferred over a separate MDF and IDF. Where equipped with vertical and horizontal terminal blocks, the left vertical side shall terminate the transmission facilities, tie cables and station equipment, and the bottom horizontal side shall terminate the circuit monitoring and patching facilities. Required battery terminations shall also be on the bottom horizontal side. Cross-connects shall be made between the right vertical and top horizontal sides.

5.5.1.4 Circuit concentration facility (CCF). CCFs may be used for locally terminating or interconnecting high speed circuits that would be impaired or degraded by excessive cable runs to other distribution facilities.