UFC 4-021-02NF
27 September 2006
change 1, 23 October 2006
CHAPTER 6
DATA TRANSMISSION MEDIA (DTM)
6-1
INTRODUCTION
A critical element in an integrated ESS is the data transmission media (DTM) that
transmits information from sensors, access control devices, and video components to
display and assessment equipment. A DTM link is a path for transmission of data
between two or more components, and back to the Dispatch Center. An effective DTM
link ensures rapid and reliable transmission of data, is resistant to compromise, has
redundancy, and is conducive to rapid fault detection and repair. A number of
technology issues are relevant to implementing the DTM, such as bandwidth analysis,
secure communications, network topology, communication redundancy, transmission
modes or protocols, and transmission media. These issues are discussed in the
following sections.
6-2
BANDWIDTH ANALYSIS
6-2.1
With any data-intensive transmission network, such as an electronic security
system network, it is important to determine the amount of bandwidth consumed by the
system under normal and alarm conditions. This can affect network cost, reliability, and
transmission speed. An example bandwidth analysis is shown below in Table 6-1. For
the DTM, design a system capable of handling the total bandwidth (plus contingency)
for each link required in the system.
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