Nortel-networks Circuit Card Instrukcja Użytkownika Strona 509

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NT7D16 Data Access card Page 509 of 906
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 168
and 169. 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 98 on page 510 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 168
RS-232-C maximum line capacitance 2,500 µF
Gauge Capacitance per foot (µF) Max distance
24 24 104
26 15 166
Table 169
RS-422 maximum line capacitance 60,000 µF
Gauge Capacitance per foot (µF) Max distance
24 24 2500
26 15 4000
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