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Bandwidth? Or traffic? (Score:5, Insightful)
This is a poorly phrased question, given that 'bandwidth' in a networking context usually refers to speed (i.e. quantity of data able to be downloaded or uploaded per second on the connection, in kbps or Mbps etc.). Obviously ~every~ connection to the Internet has some maximum speed it can attain. This maximum is either a hard limitation of the technology being used (e.g. ADSL2+ tops out at 24 Mbps), or an artificial cap imposed by the ISP (a 3 Mbps DSL connection on a line physically capable of faster speeds).
The prevalence of artificial speed caps in a market largely depends on the pricing model. In some countries, ISPs generally distinguish the various plans they offer by their speed - e.g. AT&T has 768 kbps/1.5/3.0/6.0 Mbps speed tiers for their DSL product, with prices increasing as you increase speed. Most cable companies and FiOS also have speed-based tiers. In some other places, plans are usually distinguished instead by the quantity of data you are permitted to transfer in a month (traffic caps or transfer limits). So an ISP will offer plans allowing 30/60/100/200/500/etc. GB per month transfer, with prices increasing as you go, but do not distinguish the plans by speed. The speed you get (regardless of the download limit you choose) will generally be 'as fast as the technology will allow' (for xDSL, this means people with short lines in good condition will get better speed than others).
In some ways you could argue that the two type of caps are comparable (because an artificially capped speed will also, obviously, limit the amount you can download in a month). However few people use their connection in a way that saturates the available bandwidth 24/7, so from the end-user's perspective the two are quite different.
I assume this question is referring to traffic caps, not caps on speed. In which case my situation is as follows (I have homes in the US and Australia so have two quite different situations actually):
USA:
Home connection: Cable (Charter), 30 Mbps downstream/4 Mbps upstream; a 300 GB/month transfer cap (but apparently not enforced unless you exceed it by a large amount on a regular basis, and does not attract additional fees)
Mobile connection: LTE, 'fast as the tech will allow'; a 5 GB/month transfer cap (enforced, with extra fees if you exceed it)
Australia:
Home connection: VDSL2 (TransACT), 60 Mbps downstream/15 Mbps upstream; a 200 GB/month transfer cap (enforced, connection will be slowed to 256 kbps once you exceed the cap, however no extra fees are incurred)
Mobile connection: 3G/DC-HSDPA (which is sold as '4G in the US, but isn't), 'fast as the tech will allow', 2 GB/month transfer cap (enforced, with extra fees if you exceed it)
I typically only use 80-100 GB per month on my home connection so neither the 300 GB cap on my US plan or the 200 GB cap on my Australian plan worry me. The Australian plan is slightly cheaper than the US one (and twice the speed). Also, if I were a heavy user I would have options in Australia, as the same ISP offers 400 GB and 1 TB plans I could move to. In the US though my cable provider is the only option available and I'm on their top tier plan already. So if I needed more data then I'd just have to hope they didn't enforce the cap.
The Australian mobile plan is obviously slower and with a lower limit than the US plan. But it's WAY cheaper ($20/month vs $70+), and still meets my needs.