The difference between
WS-X6548-GE-TX & WS-X6748-GE-TX
WS-X6548-GE-TX uses Centralized Bus Forwarding as opposed to
CEF720 Bus Forwarding used on WS-X6748-GE-TX.
The CEF720 uses 2x20Gbps connection to the switch fabric,
which on this case is the Sup Module (no need for a switch fabric module).
WS-X6548-GE-TX is only 1MB buffer per port while
WS-X6748-GE-TX is 1.3MB buffer per port.
WS-X6548-GE-TX is a hybrid, it supports backplane connection
in switch fabric or bus mode while WS-X6748-GE-TX can only support switch
fabric.
Personally, I see WS-X6748-GE-TX, the module of
choice if you have a Sup720 since it uses the ideal Bus Forwarding for this
hardware.
WS-X6748-GE-TX: Supervisor Engine 720, 720-10GE and 2T-10GE.
The WS-X6748-GE-TX is not supported in the Catalyst 6503
switch chassis. The WS-X6748-GE-TX module can occupy any slot in any other
Catalyst 6500 or Catalyst 6500-E chassis except the Catalyst 6513 chassis where
the module must be installed in slots 9-13. The module does not power up when
it is installed in slots 1-8.
WS-X6748-GE-TX ships with the WS-F6700-CFC daughter card
factory-installed. The module can be upgraded in the field to support the
WS-F6700-DFC3A, WS-F6700-DFC3B, WS-F6700-DFC3BXL, WS-F6700-DFC3C,
WS-F6700-DFC3CXL, WS-F6K-DFC4-A, or the WS-F6K-DFC4-AXL daughter cards.
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