Specifications

Ethernet Network Design 7-9
10BASE2 Ethernet Network Design
Workstation Connections
Workstations may be connected to the BNC T-connector in one of the
following two ways:
1. By connecting a transceiver with a BNC connection directly to the
T-connector then running up to 50 m of standard AUI cable to the
workstation.
2. By connecting the T-connector to the internal transceiver that is built
into most network interface cards on the device itself. This is the most
popular way to connect a device to the coaxial backbone in a 10BASE2
network.
Grounding and Insulation
As with 10BASE5 networks, the 10BASE2 segment must be grounded at
only one point and all remaining connectors must be insulated from
contact with ground.
Multiple Segment 10BASE2 Ethernet Network
Since 10BASE2 has a physical limitation of only 30 devices and 185 meters
of coaxial cable, it is easy to see how a network might quickly grow
beyond specifications. As with 10BASE5 Ethernet, 10BASE2 can also be
expanded using repeaters. Although a standard 10BASE5 repeater and
BNC style transceivers may be used, the more common approach is to use
a multi-port repeater such as a Cabletron Systems MR9000C. The
MR9000C has eight BNC connections to allow the connection of up to 8
full specification 10BASE2 segments. A multi-port repeater counts as only
one repeater when calculating your maximum repeater path. Many also
have an AUI port to allow for connection to a standard transceiver on a
10BASE5 network.
An AUI cable is used to go between the transceiver and the workstation,
not between the tap and the transceiver. If the internal transceiver on the
network interface card is used in a 10BASE2 network, the use of an AUI
cable is not allowed.
NOTE