Rj21 has 50 pins, ie 25 pairs.  You'll get 4 gig ports out of one.   

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On Jul 8, 2013, at 9:14 AM, Chris Marget <[email protected]> wrote:

> I've often lamented that Cisco no longer ships blades with RJ21
> connectors. I worked in a couple of shops where tens of thousands of
> user ports used this type of line card, and there were no cable
> management problems at the face of the switch.
> 
> I don't see any technical reason to have abandoned this connector.
> Maybe it didn't sell?
> 
> /chris
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