MIL-STD-188-154A
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3.4 Patch and test facility (PTF). A telecommunications control facility associated with a single subsystem specific to a transmission medium. It contains all the access points and equipment required to perform the functions
of monitoring, testing, restoring, and rerouting circuits for that subsystem.
3.5 Telecommunications control facility (TCF). A physical location providing a central point for user equipment interface, trunk distribution, and quality control of the communications circuits in a network. It contains all the access points and equipment required to perform the functions of monitoring, testing, restoring, and rerouting circuits for the supported network(s).
3.6 Transmission access. An access point at which all circuits have been conditioned for equal transmission level point. Digital circuits are conditioned to equal levels and balanced and unbalanced operation. These standard levels permit like VF circuits to be rerouted or multiplexed without additional conditioning. This access is electrically located between conditioning equipment and the next applicable equipment item.
3.7 User access. The access providing the first appearance of local digital and analog circuits in the Telecommunications Control Facility.
4. GENERAL REQUIREMENTS
4.1 General description of a telecommunications control facility. This section contains general information on the functions and requirements for those facilities serving both long haul and tactical communications systems.
4.1.1 General. Telecommunications control is a key element of any communications system or network. TCFs are the focal points for control functions such as distribution of trunks, equipment interfaces, and quality control of the communications circuits in a network. These functions may be contained in a single facility or at interconnected facilities. As equipment reliability has improved and automation has increased, the monitoring of these control functions are being done at Centralized Monitoring and Control Facilities (CMCF). This has allowed many facilities to become unmanned.
4.1.2 Functions. Telecommunications control functions are performed at the interfaces between all major transmission media and subscriber equipment (switchboards, data devices, modems, and telephone instruments used for point- to-point circuits). The following paragraphs detail the primary functions of TCFs.
4.1.2.1 Facility capabilities. TCFs are configured and engineered to facilitate use of the equipment resources to efficiently perform daily functions of coordination, fault isolation, quality control, and restoral and rerouting of circuits. These facilities enable personnel to effectively satisfy the requirements of
DISAC 310-70-1 including:
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