10Base2; Cable Type; Termination; Connectors/Taps - Cabletron Systems 100BASE-FX Cabling Manual

Ethernet Network Requirements

10BASE2

All Cabletron Systems 10BASE2 products require that installed thin coaxial cables
and related cabling hardware meet the following minimum specifications. If a
network installation does not comply with the following specifications, operation
of the 10BASE2 products may be affected.

Cable Type

Cabletron Systems 10BASE2 products are designed to be connected to 50 Ohm
RG-58 A/U type coaxial cable. If Cabletron Systems products are connected to
other types of thin coaxial cable, the 10BASE2 networks will be subject to errors
and poor performance.

Termination

All 10BASE2 cables must be terminated at both ends of the cable with 50 Ohm
terminators. Some 10BASE2 network equipment is capable of performing internal
termination. If a network device supports internal termination, and that device is
located at one end of the 10BASE2 cable, no external terminators need to be added
to the cable segment.

Connectors/Taps

10BASE2 cables may only be terminated with BNC connectors. Connectors on the
10BASE2 cable must be spaced more than 0.5 m (1.64 ft) from any other connector
or tap in the cable. If connectors are located closer to one another than this
minimum, signal reflection may occur, causing network errors and a loss of
performance.
One segment of 10BASE2 thin coaxial cable can support no more than 30 stations.
When planning a thin coaxial cable segment that will connect to a bridge,
repeater, or hub, keep in mind that one connection must be reserved for the
network device, leaving a maximum of 29 stations that may be connected to one
segment.
Connections from T-connectors to network devices may not be made through thin
coaxial jumper cables; connections must be made from the T-connector directly to
the device.
5-8 10BASE2