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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equipment as possible to limit the nonstandard circuit access appearances in the station.

5.2.2.2 Analog circuit interfacing. Analog circuit interfacing may require conditioning equipment such as amplifiers, pads, transformers, repeat coils, amplitude and delay equalizers, and analog/digital converters. This equipment shall be installed in accordance with paragraph 5.3.1.2.

5.2.2.3 Bit-stream interfacing. Bit-stream interfacing shall use matrix switching equipment or smart multiplexing equipment.

5.2.3 Tactical interfaces. Tactical systems can interface with the DCS through either High Frequency (HF) DCS entry stations, satellite, or direct physical connection to a cable entry panel. TCFs designated as HF DCS entry stations shall be provided with the equipment necessary to interface HF circuits to voice and data systems. Fixed TCFs required to directly connect to tactical control facilities shall provide an outside cable entry panel to terminate inter- connect cables. The cable entry panel shall be located to allow transportable vehicles housing tactical control facilities ready access to the panel.

5.3 Facility circuit configurations. Where both digital and analog media support is required, the circuits shall be wired dependent on the media used for each circuit or circuit segment. In most cases, incoming analog circuits are converted to digital format to enable multiplexing and switching equipment to be used to reduce patch panel requirements. Throughout this section, the terms distribution frame and access point are used. Distribution frame refers to a traditional cross connect wiring frame, wall-mounted punch blocks, or circuit connection points for automated circuit distribution equipment such as the digital access cross connect system (DACCS). Access points may be either a traditional patch panel line jack or an electronic test and monitoring access

point. Electronic access points shall be used wherever possible. In modern digital equipment, the access point may also be integrated to the equipment.

5.3.1 Digital circuits. The following paragraphs describe the specific interface points at which access to digital circuits shall be employed.

5.3.1.1 User connections. Local digital circuits normally first appear at the station at a commercial point of presence (POP) or on a distribution frame. Circuits originating within the station should be cabled directly to the distribution frame. From the distribution frame, the circuit shall be wired to a circuit access point to allow circuit quality control testing between the TCF and the user. The equipment side of the circuit access point shall be wired back to the distribution frame for cross-connection to the required interface equipment string. Figure 2 shows the normal circuit flow for the user access portion of a commercial circuit, a circuit entering the facility via base cable, and a circuit originating on in-station equipment. All circuit leads shall be cross connected and shall appear at the user access point.