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

5.5.5 Intercommunications systems. TCFs shall be provided with intercommunications systems allowing connections between facility workstations, between the facility and major user facilities, and between the station and appropriate maintenance work centers (including maintenance control). This service may be provided by using administrative telephone systems with intercom features or by providing a multi-station intercom system. Any station within the TCF must be capable of signaling any station on the

intercom system. Unmanned TCFs may be provided with an intercom system for use by visiting test/maintenance teams. Tactical TCFs shall be equipped with alternate intercommunications systems to provide backup to the site voice

switch.

5.5.6 Alarm systems. An alarm system shall be provided to alert the technical control and maintenance technicians of equipment degradation or failures that effect the communications status. Information presented by the alarm system shall facilitate prompt action toward restoring or rerouting the service and repair of faulty equipment. These alarms shall be visual but should be both audible and visual and shall have a self-test capability. Audible alarms shall have the capability of being disabled. Alarms may be presented on a computerized display, on a display integral to the local equipment installation, or on a centralized remote equipment alarm display.

5.5.6.1 Computerized alarm systems. Computerized alarm displays are normally provided with networked systems (e.g., smart multiplexer networks, switched networks, or local area networks). Where practical, this is the preferred method of alarm display. These systems provide a real time status of all networked equipment down to the port level for all circuits and equipment on the network. Additionally, a visual alarm shall accompany any degradation in status, however, an audible alarm should also be used. Since this type of alarm display can be accessed at any point on the network, it is ideal for centralized monitoring and control facilities.

5.5.6.2 Local equipment alarm displays. Telecommunications equipment usually has integral internal alarm displays. In continuously manned facilities, where equipment is located so that these displays are both visually and audibly apparent from the facility operations area, these alarm displays are sufficient. If the facility is not continuously manned, these alarms shall be remoted to the central monitoring and control facility with oversight responsibility. It may also

be necessary to provide parallel presentations of these alarms in the appropriate maintenance areas.

5.5.6.3 Remote equipment alarm displays. Those alarms which do not meet the criteria of the preceding paragraphs shall be displayed at a central location in the facility operating area. These alarms may also be simultaneously activated at a centralized monitoring and control facility or to the appropriate maintenance areas.