Technical information

LS PRO OWNER'S HANDBOOK 4/5
Networking
Chapter 4
The following table describes the hardware components.
Item Description
BNC port The BNC port on the back of the computer
connects it to a BNC T-connector.
BNC T-connector The T-connector connects to the BNC port,
and thin-Ethernet cables are connected to the
crossbar of the T-connector. (For computers
at the ends of the network, a terminator
replaces one of the cables.)
Thin-Ethernet cable High-quality thin coaxial cable (RG-58 A/U or
C/U), with a nominal impedance of 50 ohm, for
networks that use the IEEE 802.3 10Base-2
standard (e.g. Belden 9907).
A thin-Ethernet cable has BNC connectors at
each end, for connection to BNC T-connectors
or barrel connectors.
Thin-Ethernet segment Thin-Ethernet cable can normally be used in
segments up to 185 metres long, and can have a
maximum of 30 nodes (computers or other
networked devices) per segment. Neighbouring
nodes must be separated by at least 50 cm of cable.
A segment must always be a line; however many
twists and turns it has it must never branch or
form a loop.
Up to five segments can be joined together by
signal repeaters, bridges and routers.
BNC terminator When a computer is at the end of a segment, a
terminator must be connected to the open end
of the computer’s T-connector. Terminators
used with RG-58 cable must be 50 ohm.
Grounded terminator It is recommended that the terminator at one
end of the network is a grounded terminator.
The grounded terminator has a grounding wire
connected to it.
BNC barrel connector A barrel connector can be used to join two
pieces of Ethernet cable. Keeping the number
of barrel connections on a network to a
minimum increases network reliability. Do not
use T-connectors in place of barrel connectors.