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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5.5.2 Station timing equipment. TCFs shall be provided with a timing system for network synchronization which is traceable to a primary reference source, as required, by ANSI T1.101. The timing system shall provide clocking signals at all rates required by the station equipment. The Global Positioning System (GPS) satellite network is the recommended primary reference source.

5.5.3 Signaling supplies. Digital signaling (A/B bit, out-of-band, etc.) will normally be supplied by the switching or smart multiplexing equipment. Analog and DC signaling units shall be provided, as required, to support installed circuits.

5.5.4 Orderwire circuits. Orderwire circuits shall be provided in all TCFs, as required, to support control of all communications links, trunks, channels, and circuits. Orderwire circuits are normally classified as link, express, or system depending on the configuration and purpose.

5.5.4.1 Link orderwire circuits. A link orderwire circuit shall be installed on every government-owned DCS wideband radio or cable link. This orderwire circuit shall appear at both the TCF and at the radio and shall be used to troubleshoot link faults and for required maintenance coordination. The link orderwire circuit may appear in either the 0-4 kHz or 8-12 kHz portion of the supervisory baseband on analog radio systems and on channel 1 of the

3-channel supervisory multiplex on digital radio systems. Link orderwire circuits shall be bridged through sites with no channel breakout.

5.5.4.2 Express orderwire circuits. Express orderwire circuits are the primary connections for telecommunications control troubleshooting. Express orderwire circuits shall be assigned within the mission baseband/bit stream and configured for party line operation among interconnected TCFs. Where two facilities have a high volume of coordination, a dedicated point-to-point express orderwire circuit shall be provided to relieve the traffic load on the party line orderwire. When more than one express orderwire circuit is used in a facility, the capability shall be provided to conference among the orderwire circuits. Express orderwire circuit appearances shall be provided in unmanned facilities for the use of visiting test/maintenance teams. Providing access to alternate

communications (e.g., a commercial telephone system) is encouraged to provide communications in the event of station isolation.

5.5.4.3 System orderwire circuits. System orderwire circuits shall be installed for facility control office (FCO) coordination. System orderwire circuits shall be assigned within the mission baseband/bit stream. All FCOs shall have access to at least one system orderwire circuit. The FCOs may be connected together in smaller groups on multiple system orderwire circuits within the local theater of operation to limit the traffic on each party line. In this case, the capability shall be provided to conference among the system orderwire circuits. The system orderwire circuit shall not be used for coordinating routine circuit problems.