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CABLE SPECIFICATIONS
SEH USER’S GUIDE
2-3
Delay
The maximum propagation delay of a 10BASE-T link segment must not
exceed 1000 ns. This 1000 ns maximum delay limits the maximum link
segment length to no greater than 200 meters.
Crosstalk
Crosstalk is caused by signal coupling between the different cable pairs
contained within a multi-pair cable bundle. 10BASE-T transceivers are
designed so that the user does not need to be concerned about cable
crosstalk, provided the cable meets all other requirements.
Noise
Noise is caused by either crosstalk or externally induced impulses.
Impulse noise may cause data errors if the impulses occur at very specific
times during data transmission. Generally, the user need not be concerned
about noise. If noise-related data errors are suspected, it may be necessary
to either reroute the cable or eliminate the source of the impulse noise.
Temperature
Multi-pair PVC 24 AWG cables typically have an attenuation of
8 to 10 dB/100 meters at 20°C (68°F). The attenuation of PVC insulated
cable varies significantly with temperature. At temperatures greater than
40°C (104°F), Cabletron recommends the use of plenum-rated cables to
ensure that cable attenuation remains within specification.
SEH Book Page 3 Tuesday, March 19, 1996 4:12 PM