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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Access

Point

Access

Point

Transmission

Access Point

Dist

XC Frame

Horiz

Inter- face Equip

Dist Frame

Horiz

Access may be integrated into equipment

Circuit Access Point

XC Cross-Connect

FIGURE 3. Digital circuit interface equipment string.

5.3.1.3 Switches. Digital switches used as terminating or routing switches shall be wired from the distribution frame to the circuit access port of the switch. Provisions shall be made for testing both the circuit traffic and the physical path. The output from the switch will be wired to the distribution frame for connection to a multiplexer, access equipment, or local user distribution equipment. Figure 4 shows the normal circuit flow and required access points for installation of a digital switch.