according to this old thread
https://bitcointalk.org/index.php?topic=10860.0, the usage is very low around 2mb per hour, you can build a huge farm and still consume very low
bandwidth is never a problem with mining, initial investment, consumption/cooling and space are the real problem
thanks for this., i always wondered how much bandwidth does the ASIC uses, at my place internet goes down frequently.
i wonder what hapens when internet goes down, does the ASIC keeps mining or just goes haywire ?