I think your math is a little off here. A T1 only has 1.544 Mbps of
bandwidth, so ethernet has a little over 6 times a T1 worth of bandwidth.
However, all the bandwidth he would have is your total aggregate outgoing
bandwidth up to 10 Mbps. If you have one T1, he can only get to the
Internet at a maximum of 1.544 Mpbs. If you have a partial T1 (say
384Kbps), he can only get to the Internet at a maximum of 384Kbps. However,
if you have, say, a DS3 (T3) connection to the Internet, then he would have
a maximum bandwidth of 10 Mbps to the Internet.
It doesn't matter what his connection rate to you is, he can never get to
the Internet at any speed greater than your connection to the Internet.
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