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CheetaHub Power-3012B User’s Guide
iv Quick Installation
4. Connect PCs or other network devices to the RJ-45 ports.
Attach PCs or daisy-chain to
another device via the RJ-45 ports
Connect any devices that use standard network interface
cards to the RJ-45 (MDI-X) station ports (e.g., a workstation,
server, bridge or router). This hub uses auto-sensing to
dynamically set the required transmission speed at 10 Mbps
or 100 Mbps for the RJ-45 ports. To cascade to another hub
or switch, run straight-through twisted-pair cable from the
MDI port (10/100 Mbps) on this hub to any (MDI-X) station
port on the other device (or vice versa). If necessary, you
can also cascade to another hub or switch by running
crossover cable between MDI-X ports on the two devices.
Use the correct
twisted-pair cable
Use unshielded twisted-pair (UTP) or shielded twisted-pair
(STP) cable for RJ-45 connections: 100
W Category 3, 4 or 5
cable for 10 Mbps connections or 100
W Category 5 cable for
100 Mbps connections. Also be sure that the length of any
twisted-pair connection does not exceed 100 meters (328 feet).
Cascade limitations
When using the MDI port for 10 Mbps connections, note that
up to 4 hubs can be cascaded. However, when using the MDI
port for 100 Mbps connections or when using two MDI-X
ports connected with crossover cable for 100 Mbps
connections, only 2 hubs can be cascaded.
Limit total network span
When connecting devices to the dual-speed hub, note that the
total network span must be limited to:
Single Hub 200 meters of twisted-pair cable
Two-hub Chain 205 meters of twisted-pair cable (for Fast Ethernet links)
For example, if two PCs are connected to a hub, each using
100 meters (328 feet) of twisted-pair cable, then the total
network span of 200 meters (656 feet) is within the allowed
limits. However, if you cascade two Fast Ethernet hubs, and
connect a PC to each hub, each using 100 meters of cable, as
in the preceding example, then you can only use 5 meters (16
feet) of twisted-pair cable to link the two hubs together. The
only way to extend the cabling that connects the hubs is to
reduce the length of cable used to connect the PCs to the hubs.