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Configuring Networks
3-27
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
3.5 Configuring an Optical 100 Mbps Switched LAN
Products
The following components and cables are used an optical 100 Mbps switched LAN:
S Components
OSM (I)TPnn (with multimode glass fiber-optic cable)
OSM (I)TPnn-LD (with single mode glass fiber-optic cable)
S Cables
Multimode glass fiber-optic cable type 50/125 µm or 62.5/125 µm
Single mode glass fiber-optic cable type 10/125 µm
Twisted-pair cable, TP Cord
3.5.1 Fiber-Optic Links
The optical ports of the OSMs comply with the IEEE 802.3u standard:
100BASE-FX. They operate at a wavelength of 1300 nm.
Multimode glass fibers of the type 50/125 µm and 62.5/125 µm are suitable for the
connection.
To interconnect OSM (I)TPnn-LD (Long Distance Modules), single mode glass
fibers of the type 10/125 µm are the most suitable.
The possible length of the fiber-optic link is decided by the following:
S The fiber type multimode / single mode
S The power loss of the fiber at 1300 nm
S The bandwidth distance product of the fiber
Requirements of Multimode Glass Fiber-Optic Cables
Multimode glass fiber-optic cables between two OSM (I)TPnn modules must meet
the following requirements in terms of power loss and the bandwidth distance
product:
Table 3-7 Max. length of a link with multimode FOCs between two OSM (I)TPnn modules
Fiber Type
FO Power Loss
at 1300 nm
Bandwidth Distance
Product
Max. length
50/125 µm <=2.6 dB/km >= 500 MHz * km 3,000 m
62.5/125 µm <=1.6 dB/km >= 500 MHz * km 3,000 m
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