UFC 4-021-02NF
27 September 2006
change 1, 23 October 2006
Table 6-1. Example Bandwidth Calculations
Alarm
Normal
Cameras
(3.07 Mbps
Cameras
(0.61 Mbps
Total
in
per
in
per
Link
Facilities
Alarm
Camera)
Normal
Camera)
(Mbps)
B-A
Building B to Command Center
1
3.07
4
2.68
5.75
C-A
Building C to Command Center
1
3.1
9
5.5
8.6
D-A
Building D to Command Center
0
0
0
0
0
E-A
Building E to Command Center
2
6.1
10
6.1
12.2
F-A
Building F to Command Center
0
0
0
0
0
G-A
Building G to Command Center
2
6.1
10
6.1
12.2
H-A
Building H to Command Center
0
0
0
0
0
I-A
Building I to Command Center
1
3.1
1
0.6
3.7
J-A
Building J to Command Center
2
6.1
22
13.4
19.6
Note: The assumptions in the table above are based on 640 by 480 pixels resolution, a
20:1 compression ratio, and 10 frames rate per second (frame rate speed) in alarm and
2 frames per second in the non-alarm mode. Refer for Chapter 4 for bandwidth
calculations.
6-3
SECURE COMMUNICATIONS
6-3.1
No matter what transmission mode or media is selected, it is important that a
method for securing communications be included. This includes physical protection,
such as providing rigid metallic conduit for all conductors, as well as electronic
protection, such as encrypting communication transmissions. Refer to the Chapter Nine
for the subsection on Tamper Protection, which includes a discussion on physical
protection of conductors as well as more general information on encryption
requirements.
6-4
NETWORK TOPOGRAPHY
6-4.1
One of the initial steps in designing and evaluating a security DTM is to
identify the topology to be used. Additionally, the designer should coordinate network
requirements with installation security and the communications office. Typically,
networked security systems are typically a Proprietary Security Network. Refer to
Chapter 8, "ESS Subsystem Integration" for more information.
6-4.2
Three general network topographies are possible: star, ring, and fully
meshed. The concepts apply to intra-site system architectures as well as inter-site
regional configurations. A brief description of each topography follows.
6-4.2.1 Star. The star, or "hub and spoke" network involves a central Dispatch Station
(or head-end) and single communication lines out to individual sites (or field panels).
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