MIL-STD-188-154-SUP 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

Transmission

Access

Transmission

Access

Dist xC Frame

Horiz

Multiplexer

Trunk

Dist

Frame xC

Horiz

Access may be integrated into equipment

Circuit Access Point

xC Cross-Connect

FIGURE 5. Multiplexer connections.

5.3.1.4.2 Smart multiplexer. A circuit connected to a smart multiplexer shall be wired from the distribution frame to the circuit access point associated with the proper port of the multiplexer. High priority circuits may be provided with automatic switchover to an alternate port, in lieu of a physical patch. Provisions shall be made for testing both the circuit traffic and the physical path. The inputs to the multiplexer may be original digital circuit, output of the conditioning string, multiplexed output from another multiplexer, output of a matrix switch, or interswitch trunk output of a digital switch. The output of the multiplexer shall be wired to a distribution frame. Figure 6 shows the normal circuit flow and access required for connection to a smart multiplexer.