Nortel Networks Circuit Card - Manual (Page 509)

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