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

w/CHANGE 1

User Access

Commercial

Circuit

xC Commercial xC

POP

Base

Cable

In-station

Equipment

Distribution

Frame

- Vertical

Distribution

Frame xC -Horizontal

Distribution

Frame

-Horizontal xC

Circuit Access Point

Access may be integrated into equipment such as a DACCS

xC Cross-Connect

FIGURE 2. Digital circuit - user access portion.

5.3.1.2 Interface equipment. The circuit shall be wired from the distribution frame to the required interface equipment string. This string shall include line access equipment (channel service units/data service units (CSU/DSUs), modems, line drivers, etc.), conditioning equipment (regenerative repeaters, protocol converters, etc.), and cryptographic equipment as required. Capabilities for circuit testing and patching shall be provided between each piece of equipment to allow for fault isolation and equipment substitution. This

may be achieved by wiring back to a distribution frame for connection to manual patch panels or electronic access points or by using access points integral to the installed equipment. After transiting the interface string, the circuit will be in a format suitable for connection to a multiplexer, digital switch, cable access equipment, or commercial access equipment. The circuit shall then be wired to the distribution frame for connection to the next applicable equipment item. Figure 3 shows the normal circuit flow for the interface equipment portion of a digital circuit. All circuits leads shall be cross connected and shall appear at the circuit access point.