NT7D16 Data Access card Page 497 of 894

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.

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

 

 

 

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.

Circuit Card Description and Installation

Page 497
Image 497
Nortel Networks 553-3001-211 manual Cabling