IBM ATM OC-3c Manuel d'utilisateur télécharger pdf (Page 93)

ATM Cable Specification C-3

To check that the bandwidth of your fiber is within an

acceptable range:

Divide the amount of bandwidth available according

to the fiber specification by the total length of fiber

(km).

If the result is lower than 250MHz, the link may be

prone to bit errors. You should shorten the length of

the fiber or use a different fiber until the result of the

calculation reaches 250MHz.

Example:

A cable with modal bandwidth of 500 MHz.km will

have 250 MHz of bandwidth at 2km (1.25 miles).

The same cable would have a 500MHz of bandwidth

at 1km (0.625 miles).

A fiber cable with a bandwidth specification of

200 MHz.km would have only 100MHz of bandwidth

at 2km (1.25 miles), which would not support ATM.

In this case, another type of fiber which has a

bandwidth of 155MHz would be required.

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IBM ATM OC-3c Manuel d'utilisateur Page 93