Home' RTCA Documents for Review : DO-230H FRAC Contents 241
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Voice over Internet Protocol (VoIP) Working Group, a collaboration of public safety practitioners,
industry representatives, and Federal partners brought together to define and clarify the
expectations for VoIP in emergency response communications.
In addition to commercial cellular and wireless LAN services, other types of commercial services widely
used for everyday non-critical communications by public safety agencies generally fall into one of the
Specialized Mobile Radio (SMR) may provide mobile dispatch and data communications services.
Interoperability within the SMR service falls under the “single system strategy.” Unfortunately,
interoperability outside of the service may be limited due to the lack of common standards and
protocols, which is further compounded by the fact that SMR systems are licensed across three
different frequency bands (220 MHz, 800 MHz and 900 MHz).
Mobile Satellite Service (MSS) offers digital broadcast capability, which allows the dispatcher to
speak to a single user, a group of users or all network users. Users can in turn communicate with
members in predefined talk groups. Users within a talk group can communicate via a one-way
group call or through standard two-way communication. Interoperability is provided only between
users of the system or to individuals connected to the public switch telephone network.
Voice-over-Internet Protocol (VoIP) voice and collaborative services offered by providers such as
Skype and implemented over wired networks, wireless LANs, and cellular services. When Skype
users communicate with each other, the communications are secured.
Wireless IT Networks, also known as Wireless LANs (WLANs)
Wireless LANs, based on the Ethernet protocol and governed by IEEE standards, transmit in the unlicensed
radio frequency bands, and can be used to support communications to temporary, and remote, areas that are
cost prohibitive to install cable or require rapid deployment. Reliance on wireless network transport should
be tempered by an appreciation for the speed, bandwidth, distance, reliability, and security related
limitations of the technologies available. Refer to Section 9.4 Threats for a review of the security issues
associated with Wireless Local Area Networks (WLAN). The common Wireless Fidelity (Wi-Fi) and the
more robust Worldwide Interoperability for Microwave Access (Wi-Max) are discussed in detail in Section
9.10 Wireless Networks and Devices along with Radio Frequency Identification (RFID) and Near Field
Regulatory Requirements and Standards
Standards are essential for communication systems and computer networks to function properly. In the
U.S., the following standards bodies should be of interest to airport operators:
The Institute of Electrical and Electronic Engineers (IEEE) publishes standards for networking
architectures, such as Ethernet networks; for network devices such as a network switch or a wireless
access point; and for a variety of electrical power, communications, and other equipment and
systems. Among the most applicable would be the IEEE 802.3 Communications Standards
defining the physical layer and data link layer's media access control (MAC) of wired Ethernet with
its applicable supplements ‘a through af’.
The Telecommunications Industry Association (TIA) publishes standards for telecommunication
facilities and for the cable plants that serve them, in addition to other standards.
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