Noise contributions

Noise contributions are defined on a per channel basis in pWOp.

Table 20.9 Design targets for noise contributions from open wire systems with 2500km circuit length

Table 20.10 Design targets for noise contributions from metric pair cable systems, coaxial cable and radio systems with 2500 km circuit length

Recommended design targets are included in Tables 20.9 and 20.10. The line equipment noise figure in Table 20.10 corresponds to 3pWOp per km. For wideband services, such as TV transmission, the equivalent requirement is more onerous at 1.5pWOp mean noise contribution per km.