MIL-STD-188-154A
w/CHANGE 1
suitable for connection to a time division multiplexer, digital switch, cable access equipment, or commercial access equipment. In modern digital facilities, switches provide some or all of the interfacing requirements, including analog/digital conversion. These switches shall be used, when possible, to reduce the amount of equipment required in the interface string. Figure 8 shows the interface string circuit and access requirements.
User Access Transmission
Access
Commercial
Circuit Commercial xC POP
xC Data
xC Data
Base
Cable
In-station
Equipment
Distribution
Frame
- Vertical
Distribution
Frame xC
-Horizontal
xC
Data
Data
Conditioning
&
xC Interface
Equipment xC
Data
Data
Distribution
Frame
xC
-Horizontal
xC
Circuit Access Point
xC Cross-Connect
Access may be integated in equipment
Access may be integated in equipment
FIGURE 8. Analog circuits user access and interface equipment.
5.4 Centralized monitoring and control facilities. Centralized monitoring and control facilities may be used to manage either unmanned TCFs or to manage networks or subnetworks. Examples of the latter are the DISN Level II Network Operations Center (NOC) and Local Area Network (LAN) management facilities. All alarm and status displays necessary to provide full status are extended to the centralized monitoring and control facility. A network management facility shall have full configuration control over the managed network, including full reroute and restoration capability. This capability is also recommended, where possible, for unmanned facility management. Physical and electrical standards for a centralized monitoring and control facility are identical to those for any other TCF.
5.5 Internal subsystems. The configuration and minimum performance standards for internal subsystems in TCFs are as follows:
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