EtherHub-16 Quick Start Guide
4
Hardware Description
RJ-45 Ports
This hub has 16 RJ-45 ports that can be used to connect end-node devices (e.g., workstations, file
servers, or printers). Be sure you have an Ethernet network interface card installed in the device
to be connected to the hub. Then connect it to any available standard RJ -45 port on the hub (i.e.,
Ports 1~16MDI-X) using straight-through twisted-pair (UTP or STP) cable.
Note: When Port 16MDI-X is used, Port 16MDI cannot be used.
Daisy-Chain Port
A compatible hub or other network interconnection device (e.g., an Ethernet switch) can be
attached to the daisy-chain port (Port 16MDI). Use straight-through twisted-pair (STP or UTP)
cable to connect to a standard MDI-X port on the target device. Up to 4 hubs can be cascaded in
this manner. To connect to another hub, you may also run twisted-pair cabling from an MDI-X
port on this hub to an MDI daisy-chain port on another hub. However, if you must connect to
another hub via standard MDI-X ports at both ends of the cable, use crossover cabling.
Note: When Port 16MDI is used, Port 16MDI-X cannot be used.
BNC Port (10BASE2)
This hub has two built-in BNC transceivers (i.e., BNC1 and BNC2) on the rear panel for
connection using thin coaxial cable. To use either BNC port, set the DIP switches to the correct
positions and described on page 2. A BNC port can be connected to a thin coaxial cable segment
containing up to 30 nodes. The thin coaxial cable that links the BNC ports may be extended up
to 185 meters and have computers or other Ethernet devices attached to it. When connecting two
hubs via BNC ports, there should be at least 0.5 meters (1.64 feet) of coaxial cable between the
two BNC ports. If the hub is at the end of an Ethernet cable, plug and lock the 50-ohm (
Ω
)
terminators to the T-type connector on the BNC port.
F
Close off an open end of any T-type connector that is plugged into a BNC port with a 50-
Ω
terminator. In particular, when a hub using the BNC port connection is at the end of an
Ethernet segment, close off the open end of the T-type connector with a 50
Ω
terminator.
Also, if the BNC port is not used, plug a T-type connector into it and close off both ends with
a 50
Ω
terminator.