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

Transmission

Access

Media

Access Access

XC KG

XC Dist

Frame

Media

Dist

XC Frame KG Horiz

XC KG

Media Access Equip

Dist

Frame

Horiz

Vertical

XC Commercial

POP

Circuit Access Point

XC Cross-Connect

Access may be integrated into equipment

FIGURE 7. Media access connections.

5.3.2 Analog (VF) circuits. The analog VF circuits in most TCFs are directly connected to the analog users. The most common analog circuit is voice service, however, modem tone packs may also be in use. These circuits shall

be converted to digital format unless the circuit is only traversing the TCF and breaking down of the signal is not required. An example of this is when the circuit is routed directly to modern digital switching equipment that provides for the analog/digital conversion. All analog circuits traversing the TCF shall be conditioned to provide equal transmitting and receiving levels.

5.3.2.1 User connections. All VF users shall access the TCF via a user access. Local analog circuits normally first appear at a commercial POP or on a distribution frame. From the distribution frame, the circuit shall be wired to a

user access point to allow circuit quality control testing between the TCF and the user. Figure 8 shows the required circuit flow for the user access portion of the circuit.

5.3.2.2 Interface circuits. All circuits shall be wired from the user access to the required interface string. This string may include signaling equipment, conditioning equipment (amplifiers, equalizers, etc.), analog/digital conversion (modems), and cryptographic equipment as required. Capability for circuit testing and patching through an access point will be provided between each piece of equipment to allow for fault isolation and equipment substitution. After transitioning through the interface string, the circuit shall be in digital format