Re: Eir, Vodafone & Sky
Actually there is a simple definition of what 'broadband' actually means.
It means that there are multiple carrier frequencies running over the transmission media. Basically frequency division multiplexing (FDM).
In the dim and distant past, when thick and thin wire Ethernet or Token Ring was the main data networking technology, this used time division multiplexing, sometimes called narrow-band, because there was only one digital data stream, and each network station got a share of the total available.
Cable TV started using multiple frequencies over coaxial cable to provide analogue cable TV, which was the first time many people outside of the comms. industry would have come across 'broadband' (unless you count ordinary OTA analogue TV).
One place I worked, we had a data network that ran over coaxial cable with multiple data channels being carried (multiplexed) on different frequencies down the cable (actually it was a hybrid system, because there was TDM being done on each of the FDM channels).
All *DSL systems are broadband, there being multiple carrier frequencies being sent down the 'phone line. DOCSIS is broadband because of there being multiple carrier frequencies over the cable.
Interestingly, most Fibre is also broadband, because the carriers use multiple frequencies of laser light down the Fibre, although it is not clear to me whether this is what is delivered in FTTP (it definitely is in the backhaul or core network). I did read a description that suggested that the down path on FTTP was shared TDM spread over multiple FDM carrier frequencies, and the up path was FDM, with each customer having their own frequency. This means that it is possible to split and combine the different feeds using passive optical splitter nodes at the pole/distribution point, and only need expensive powered switches at the cabinet.
I'm not sure whether 4G counts as broadband. There are definitely multiple carrier frequencies being transmitted and received, so I suppose that it must by the definition I gave at the beginning of this post.