Maximum Number of Stations
Page 2-3
•
Token Ring signals should not be routed through UTP cables
that exit a building or which are adjacent to cables either exiting
a building or exposed to lightning strikes and power surges.
•
UTP cables that contain Token Ring signals should not be
simultaneously used for applications which may impress high
voltages (greater than 5 volts) with sharp rise or fall times, since
the noise coupling from such signals could directly cause errors
on the Token Ring network.
•
For single telecommunications closet rings, lobe lengths should
not exceed 100 meters of 22 to 24 AWG wire from the attaching
device and the TCU port.
•
Where practical, dedicated cable should be used for Token Ring
signals.
•
Work area wall plates and outlets used for the Token Ring
network should be clearly labeled as Token Ring network lobe
connections.
2.1.3 Maximum Number of Stations
The maximum number of stations in a single ring, using STP lobe
cabling is 250 stations.
Although higher numbers are possible with better quality cabling,
when UTP lobe cabling is used anywhere on the ring, the
recommended limit is 150 stations.
2.2 UTP CABLING SPECIFICATIONS
Both UTP concentrator modules (TRXMIM-22A / 24A) support
D-inside wiring (DIW) voice grade Unshielded Twisted Pair (UTP)
cable as described in EIA SP-1907B and below. All category 5, all
category 4, and some (see Section 2.2.2, UTP Cable Lengths to
Stations
, on page 5) category 3 UTP cables meet Token Ring
network performance requirements.
