Bandwidth Calculation

[jp0801]

Can someone tell me any formula used to determine line speed and number of T1 circuits needed when transmitting a 500 Mbyte file over the WAN?

Thanks in advance

[olorunloba]

Well, I think any amount of bandwidth will transfer the file, just the length of time it will take is what will differ. Like how long do you want the transfer to take, that will the most important factor in the bandwidth subscription

[jp0801]

10 minutes

[vcjones]

500 Mbytes times 8 bits/byte divided by 600 seconds = 6.7 Mbps

Assumptions:

1 Mbyte = 1,000,000 eight bit bytes

Negligable overhead for protocols

Round trip delay is less than window size

Applications at each end are capable of sustaining the data rate.

No other traffic competing for link bandwidth.

All components in the path, not just the link, can sustain the data rate.

Note that none of these assumptions are safe assumptions. But they are a starting point for understanding the requirements.

Good luck and have fun!

Vincent C Jones

www.networkingunlimited.com