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Designing and Expanding the Network 2 - 7
Fiber Backbone, Twisted Pair To-The-Desk
When you configure a network with unshielded or shielded twisted pair
cabling to-the-desk and fiber for the backbone, there are only three
additional rules you need to be aware of:
❑ There can be no more than eight 10BASE-T Modules (5108M-TP) in
the path between any two transceivers due to Ethernet's
four-repeater rule (each 10BASE-T Module counts as a 1/2 repeater).
You must add a bridge if you have more than eight 10BASE-T
Modules serially connected.
❑ There is an equivalent fiber distance for the ONline Fiber Modules
(see Rule 4). The equivalent is:
– 140 meters for signals that externally enter a Fiber Module
port
– 50 meters for signals that internally enter a Fiber Module
via the ONline Concentrator backplane
ONline Ethernet BNC Module 900
Incoming signal to BNC port 450
Outgoing signal from BNC port 450
ONline Ethernet Repeater Module 800
Incoming signal to AUI port 600
Outgoing signal from AUI port 200
IEEE Repeater 800
Table 2-2. LAN Product Equivalent Distances (Continued)
LAN Product
Equivalent
Distance (meters)