Hmmm...
Why would you need 1000Mbps of bandwidth? Nortel's solution is distributed across many links and network connections. Example; Voice Gateway Media Cards (VGMCs) currently provide 32 DSPs each and a site could have just one or it could have five each with their own 100Mbps link).
In a Succession 4.5 Call Server the ELAN is still relegated to 10Mbps while the TLAN runnings at 100MBps.
If your talking about PCs hanging off the 11x0e series phones then the answer is yes, the PCs will get a 1000Mbps connection but only with the 11x0e series phones (not the i2002, i2004 or i2007).
Cheers!