AT&T System 75 Wiring Diagram page 106

Table 3-E shows an algorithm for patch cord requirements based on the
line capacity of the switch.
Table 3-E. 110 Patch Cord Requirements
Line Size
216-648
648-800
Typical System Equipment Room Floor Plans
Patch Cord
Length
2 Feet
3 Feet
4 Feet
5 Feet
0-216
6 Feet
7 Feet
8 Feet
9 Feet
2 Feet
3 Feet
4 Feet
5 Feet
6 Feet
7 Feet
8 Feet
9 Feet
2 Feet
3 Feet
4 Feet
5 Feet
6 Feet
7 Feet
8 Feet
9 Feet
Percent of Line
Size Required
10.0%
16.5%
29.3%
26.0%
18.2%
0%
0%
0%
5.5%
15.5%
29.3%
27.0%
15.9%
6.8%
0%
0%
3.0%
10.3%
22.1%
25.7%
22.5%
8.5%
5.7%
2.2%
3-23