Cable Lengths; Dedicated Safety And Security Networks - Siemens DMS8000 Applications And Planning Manual

5.1.2

Cable lengths

5.2

Dedicated safety and security networks

Siemens Building Technologies
Fire & Security Products
Segment 1
Repeater (Hub) 2
1 2 3 4 5 6 Upl ink S D
100B ase-T X 100B ase-TX
13 14 15
1 2 3 4 5 6 13 14 F DX
LANbooster 123 A /L O N LANbooster 123
PWR A /L A/ L
FDX FDX 1 23
7 8 9 10 11 12
7 8 9 10 11 12
Segment 2
Segment 3
Repeater (Hub) 3
1 2 3 4 5 6 S D
Upl ink
100B ase-T X 100B ase-TX
13 14 15
F DX
1 2 3 4 5 6 13 14 O N
LANbooster 123 A /L A/ L
PWR A /L FDX FDX
7 8 9 10 11 12 1 23
7 8 9 10 11 12
Segment 4
Repeater (Hub) 4
1 2 3 4 5 6 Upl ink S D
100B ase-T X 100B ase-TX
13 14 15
1 2 3 4 5 6 13 14 F DX
O N
LANbooster 123 PWR A /L A /L A/ L LANbooster 123
FDX FDX 1 23
7 8 9 10 11 12
7 8 9 10 11 12
Field
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.
Optimally, you should use Cat. 6 twisted pair cable.
Note: The maximum cable length is 100 meters, installed as follows:
–
90 meters fixed installed cable (Horizontal cabling)
–
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, "Ethernet" on page 69.

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;
–
You choose the components;
–
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.
DMS8000_Application_Specification_&_Planning_MP4.10_A6V10063710_a_en
Repeater (Hub) 1
1 2 3 4 5 6 Upl ink S D
100Bas e-T X 100B ase-T X
13 14 15
1 2 3 4 5 6 13 14 F DX
A/ L O N
P WR A/L A/L
FDX F DX 1 23
7 8 9 10 11 12
7 8 9 10 11 12
1 2 3 4 5 6 Upl ink S D
100B ase-T X 100B ase-TX
13 14 15
1 2 3 4 5 6 13 14 F DX
O N
PWR A /L A /L A/ L
FDX FDX 1 23
7 8 9 10 11 12
7 8 9 10 11 12
Segment 5
Field Field
NK8000 Network planning
06.2007
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