If you are SPEAKING, your connection is required to send at a rate of about 8kbit per second average .. but it must send this data to up to seven people (your team-mates) .. so the outgoing bandwidth rises to 56kbit in that case, in addition to the game related data..
If you are receiving voice chat from another player, UDP bandwidth use is just 8kbit downsteam.
The incoming TCP game data stream from the sony servers amounts to what looks to be at most 50kbit .. in fact, with a four to six person game, we recorded an average bandwidth utilisation of just 11kbit down, and 2kbit upstream, over a period of 24 minutes. A 10 to 16 player game utilised about 20kbit down, on average.. but would probably burst higher.
Note: the following is still speculation:
Oddly, though, there is also a UDP data stream, that seems to be sent to just one players ps2 (presumably the 'host'). This contains, perhaps, player movement commands, and comprises up to 100 bytes per second (1kbit). If all players are sending this, then the game host maybe receiving 16kbit per second in additional data.
The host is also sending to each player, 50 to 150 byte UDP packets, up to 700 bytes per second maximum rate.. this is 7kbit per second! if the host is really sending to all 16 players, they are using up to a 100kbit upload capacity!
One can conclude the following:
Bandwidth usage estimate for 'player':
TCP game data down: 20kbit average
UDP host data down: 7kbit average
UDP host data up: 1kbit average
Receiving talk down: 8kbit avg
Transmitting talk up: 100kbit max
Upstream usage: 2kbit to 60kbit (for talking)
Downstream usage: 27kbit to 35kbit (for talking)
Bandwidth usage estimate for 'host':
Same as player use, with the exception that you must add 100kbit more for 'player' data! So upstream capacity is up to 164kbit (if you talk and host).
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