TOKEN RING FIBER EXTENDERS
15
4.
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Typical Applications
4.1
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Fiber Lobe Link Station to Concentrator
A site has a remote station which is to be connected to a MAU via fiber. This is the main
application for LCL112A-TRs. In this mode auto-negotiation between switches and
frequency lockout mechanisms all work as intended.
Figure 2: Station to Concentrator Link
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The total copper link length can be up to 100m; the fiber link can be up to 40km on
single-mode. This configuration is also applicable to remote server to switch
architecture.
NOTE: In Dedicated Token Ring Switches automatic switch configuration must not
be used. The switch at one end must be defined as station and the other as
concentrator (as shown above).
4.2
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Fiber Trunk Link Between Stations
For links between servers or switches, the LCL112A-TR can be used to provide a
point to point link as shown in Figure 3. In this mode the fiber link operates as a fiber
backbone with lobe ports attached at the LCL112A-TRs. Devices inserting into the
ring cannot see the far end device until after insertion has completed. In this mode
auto-negotiation will not operate as the two ends do not communicate until after
insertion. This application works well for fixed data rate station to station half duplex
links.
