[c-nsp] WS-X6148-GE-TX limitation

[morph]

Hi all :)

I have several routers (7600 family) with this module.
I can see there is a limitation as shown in 
http://www.cisco.com/en/US/customer/products/hw/routers/ps368/products_configuration_guide_chapter09186a0080160eb8.html

"The WS-X6148-GE-TX and WS-X6148V-GE-TX switching modules do not support 
more than
1 Gbps of traffic per EtherChannel."

When I bought this equipment in Cisco, they told us nothing about this 
limitation (they know that we need etherchannels supporting more than 
2-3 Gb)

Is it at last a problem with the switch fabric or more related to the 
IOS that support it?

Cheers