NK8000 Network planning
61
Siemens Building Technologies
DMS8000_Application_Specification_&_Planning_MP4.10_A6V10063710_a_en
Fire & Security Products
06.2007
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Field
Field
Field
Segment 1
Segment 2
Segment 3
Segment 4
Segment 5
Repeater (Hub) 1
Repeater (Hub) 2
Repeater (Hub) 3
Repeater (Hub) 4
Fig. 35
10BaseT network with up to 4 repeaters in serial star topology
100Mbps network
For a 100Mbps network, it is not possible to extend the line length with the 5-4-3 re-
peater rule. This is due to the faster speed.
The maximum number of repeaters in serial for 100Mbps Ethernet is 2.
5.1.2
Cable lengths
Optimally, you should use Cat. 6 twisted pair cable.
Note: The maximum cable length is 100 meters, installed as follows:
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90 meters fixed installed cable (Horizontal cabling)
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10 meters patch cables (both sides together)
The cable length for fibre optic depends on the Ethernet technology employed.
Please refer to the table in section 5.4.4,
”
on page 69.
5.2
Dedicated safety and security networks
We recommend you build dedicated safety and security networks whenever it is pos-
sible. Advantages of dedicated safety and security networks are:
–
You control the network;
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You choose the components;
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You can place the network components in your own housings;
–
You can profit from power supplies with battery backup of the control units;
–
There is no risk that other bandwidth-intensive applications will reduce the per-
formance of the network.
Disadvantages of dedicated safety- and security networks are:
–
You need trained staff for commissioning and maintenance of the network;
–
You may need to keep some additional spare parts in stock.
–
Higher installation costs.
