NT7D16 Data Access card Page 497 of 894
Circuit Card Description and Installation

Cabling

Several cabling schemes are possible for both AILC and RILC modes.
Typical capacitance for 24- and 26-gauge cables is shown in the Tables 163
and 164. RS-232 and RS-422 transmission distance is limited by the electrical
capacitance of the cable. Low-capacitance cable carries a digital signal
further than a high-capacitance cable.
Figure 95 on page 498 shows the cabling choices available. It includes
cabling with the RS-232-C cable, associated patch panel, the RJ-11, and the
octopus cable. Each scheme can be tailored to suit individual needs, and
specific alternatives are shown in later figures.
Table 163
RS-232-C maximum line capacitance 2,500 µF
Gauge Capacitance per foot (µF) Max distance
24 24 104
26 15 166
Table 164
RS-422 maximum line capacitance 60,000 µF
Gauge Capacitance per foot (µF) Max distance
24 24 2500
26 15 4000