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CABLING
B.3.3 Determining The Maximum Signal-Drive Distance
One of the most important physical-design factors to consider when
installing a Token Ring network is the maximum signal-drive distance.
The drive distance threshold for any of the categories of cable types
(STP, UTP, fiber) used in an installation is the maximum distance a signal
can travel intact across the cable between active devices without loss of
data.
Signal loss is caused primarily by two conditions: attenuation (weakening
of signal strength) and jitter (received versus transmitted signal clocking).
Remember that any condition that degrades signal integrity seriously
compromises the reliability of the network.
Determining Factors
The maximum drive distance achievable from a multiple-station Token
Ring cabling installation is dependent on the following factors:
•
Media types used for both lobe and trunk cabling in the installation and
the drive-distance thresholds specified for the types of cable used.
•
Ring operating speed.
Presence of active devices (with repeater circuitry) and passive devices
•
(without repeater circuitry) in the installation and the total number of
both in the installation.
Number of patch panels used in the installation.
•
B.4 CABLE PINOUTS
This section presents the signal assignments for RJ45 station, lobe, RI,
and RO port pins.
B.4.1 Station Port Pins
Figure B-2
illustrates the signal assignments for RJ45 station port pins.
B-4
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