Network configuration
OmniTrax Product Guide Page 225
Network configuration
The recommended configuration for a Silver Network is a closed-loop with each end of the loop
connected to a communication channel on the NIU. There should also be two connections
between the NIU and the NM. This closed-loop arrangement takes advantage of Silver’s
redundant communication capabilities. However, it is possible to use a linear configuration with a
single processor connected to the NIU. The main drawback to this configuration is that a single
break in the com-link, or a failed processor, will interrupt communication to all processors further
down the line.
Silver Network specifications
• Data rate - fixed 57.6 k bps
• Maximum 60 devices spread over up to 4 independent network loops
• Two communication channels (Side A, Side B)
• Response time - 1.0 second, or less from alarm source to Network Manager (per loop)
• Transmission media/maximum separation distances between processors:
• OmniTrax OC2 sensor cable - approximately 800 m (2625 ft.) for continuous detection
• OmniTrax SC1/SC2 sensor cable - approximately 400 m (1312 ft.) for continuous
detection
• EIA-422 copper wire - 1.2 km (0.75 mi.)
• Multi-mode fiber optic cable - 2.2 km (1.4 mi.) - 2 fibers per channel
• Single-mode fiber optic cable - 10 km (6.2 mi.) - 2 fibers per channel
OmniTrax network communication and synchronization options
Silver Network based OmniTrax processors have twelve options available for network
communications and processor synchronization. You select the communication/sync mode via the
UCM, under the Network Cfig tab. When you select an option, a corresponding diagram is
displayed below the selection. Figure 193:
includes the UCM selectable communication/sync
options along with the diagrams and descriptions.
Note The NM supports up to four independent network loops. Each loop
requires an NIU, and additional ports are required in the host PC. A Silver
Network using additional network loops is limited to 60 network devices.
Note The maximum separation distances require sound installation practices
and high quality communication cables.
Senstar recommends the use of Belden 9729 or equivalent data cable for
EIA-422, 62.5/125 multi-mode fiber optic cable and 9/125 single mode
fiber optic cable.
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