ATM Cable Specification |
To check that the bandwidth of your fiber is within an acceptable range:
1Divide the amount of bandwidth available according to the fiber specification by the total length of fiber (km).
2If 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.
