Cable Data Rate
Maximum possible data rate
The maximum permissible data rate is given below as cable length in meters. Note that the data rate is provided as signalling rate in bits per second bps.
Cable Length vs Data Rate
Note that a bit rate of up to 100k may be used up to a distance of 1200 meters. However above 1200 meters the possible data rate reduces rapidly.
Cable Length vs Data Rate vs Rise Time
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Cable Derating Guide Lines
The unbalanced voltage digital interface
circuit can generally be utilized on data, timing or clock, and
control circuits where the signaling rate on these circuits is up to 100
kilobits per second (kb/s). An example of an unbalanced [single ended] interface would be the RS423 Circuit.
The balanced voltage digital interface circuit can generally be utilized on data, timing or clock, and control
circuits where the signaling rate on these circuits is up to 10 megabits per
second (Mb/s). The terminated voltage digital interface circuit
can generally be utilized on data, timing or clock, and control circuits
where the signaling rate on these circuits exceeds 10 Mb/s. An example of an balanced [differential ended] interface would be the RS422 Circuit.
While the balanced voltage digital interface circuit is intended for use at higher
signaling rates than the unbalanced voltage digital interface circuit, the
general use of the balanced voltage digital interface circuit is recommended where any of the following conditions prevail:
a. The interconnecting wire or cable is too long for effective unbalanced operation.
b. The interconnecting wire or cable is exposed to extraneous noise
sources that may cause an unwanted voltage in excess of plus or
minus one volt measured differentially between the signal conductor
and circuit common ground at the load end of the wire or cable with
a 50-ohm resistor substituted for the generator.
c. It is necessary to minimize interference with other signals.
d. Inversion of signal sense of the transmitted signal may be required,
e.g., plus MARK to minus MARK may be obtained by inverting
the wire or cable pair of the balanced generator.
