Home' RTCA Documents for Review : DO-230H FRAC Contents 259
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CCTV cameras not connected to the network will normally use point-to-point fiber from edge locations to
a telecommunications room. Coax or copper twisted pair cabling may also be used for short distances.
Both fiber and copper network cabling runs in public areas of the airport should be installed in conduit or
EMT for protection. Conduit and EMT are also preferred for runs in secured areas but cable trays are also
permissible. Conduit and cable tray fill ratios should follow TIA specifications.
There are several options available to airports which have significant investments in legacy cabling such as
serial data cabling (RS-232C and RS-485 types) and coax cabling for video cameras. Many of these
applications can be served by media converters, which allow copper legacy cable and protocols to interface
to network fiber cabling. Converters are also available to provide Ethernet capability over existing coax
and RS-485 as well as the reverse, and to put analog signals onto Ethernet protocols as well as converting
RS-485 and similar protocols over Ethernet links. The issue of cable reuse is primarily economically driven
unless transmission bandwidth requirements of specific devices exceed legacy plant capabilities.
Networked devices which are powered over network copper cabling should comply with IEEE
specifications for Power-Over-Ethernet applications.
For access control devices, in a typical system the control functions will fan-out from a control panel to the
various doors in a facility, with card readers generally being connected to doors using the Wiegand protocol.
All other functions at the door, such as the Door Open/Shut sensor, the Request-to-Exit switch and the
auxiliary controls, should be wired directly back to the control panel.
Control panels may or may not be connected to a host computer using RS-485 cabling. Control panels
should be installed on the secured side of portals, not on the public side.
All public side devices should include key locks and tamper alarm.
When designing a network all switches should be manageable.
Communications devices and network devices make use of several types of wiring including coaxial cabling
(several types are available, including ported cables for in-building communications), twisted copper
cabling, network-standard copper cabling, and fiber optic cabling. For IT networks, the term “structured
cabling” generally refers to copper cabling conforming to IEEE standards and “backbone cabling” generally
refers to fiber optic cabling.
Cabling management includes the process and standards by which cabling and cabling infrastructure
systems are installed, maintained, assigned, and labeled, both initially and throughout the lifespan of the
Cabling infrastructure systems are composed of the structures by which cabling is contained, protected,
secured and/or routed from point to point. Elements within cabling infrastructure include conduit, boxes,
cable trays, and the various means of grouping, separating, routing and isolating cabling.
Airport operators should take the earliest opportunity to design a cabling management plan which identifies
standards for types of cable, how and where cabling is routed and its related infrastructure is installed; and
standards for labeling, such as color-coding or other identification methods. The plan should also address
the assignment of cabling for each individual system’s use; include a “conduit plan” which documents the
origination and destination of all conduit runs within the facility, including standards for wiring end devices
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