MRV Communications MR2228-S2C - Manual (Page 14)

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Figure 2-2. Network Aggregation Plan
Remote Connections with Fiber Cable
Fiber Optic Technology allows for longer cabling than any other media type. A
1000BASE-SX SFP transceiver can be used for a high-speed connection
between floors in the same building and a 1000BASE-LX SFP transceiver can be
used to connect to other buildings in a campus setting. For long-haul connections,
a 1000BASE-LH SFP transceiver can be used to reach another site up to 70
kilometers away.
The figure below illustrates this switch connecting multiple segments with fiber
cable.