[FireBeyond]

Comcast fiber is 3gbps (sold as 2gbps) and provisioned via a Juniper box to you which acts a bridge alone, with SFP+ port giving 2gbps, and a GigE port separate.

[sathackr]

That still doesn't define a requirement for >1gb/s in a single flow.

A flow is a single connection, such as downloading a file from a single IP address.

When you download a single file from multiple sources (such as with Bittorrent), each connection to each source is a flow.