Shielded cable that cannot be grounded

[pcblearner]

Hello

Here is a newbie question... I want to use a cable for some signal lines (I2C to be exact) and since this cable goes between boards, I would like the cable to be shielded. Now, my understanding is that if the shield of the cable is not connected to signal ground, it can actually behave as an antenna (as EMI can induce voltages on the shield) which is bad.

So, why is it that when I look at cables like this: http://www.digikey.com.au/product-detail/en/30-00279/T1247-30-ND/4581653
There is clearly a shield, but I cannot see any way to actually connect to the ground... I am wondering if I am missing something here...

Thanks

[sparx]

Afaik the connector jacket may make a physical connection to the shield (Such as the case with satellite coaxial cable and F connectors do), or may accept a soldered connection to connect the shield?

[PeterFW]

I am wondering if I am missing something here...

There are soooo many different ways to connect the shielding of a cable, i guess you mean the "braidet copper" part around the main conductors.

Depending on the connector the shield makes the connection though a press fit, crimp or you untangle it, put shrink wrap over it and treat it like a 4th conductor.
Here is a picture:
https://robrobinette.com/images/Audio/Canare_Star_Quad_Cable.JPG

[Richard Crowley]

The shield (whether it is braided or simply spiral-wapped) is simply "unraveled" and twisted together as its own wire.  Then you connect it just as you would any of the inner wires.

 

[pcblearner]

Thanks everyone I understand now.

[KeepItSimpleStupid]

Unraveling, is the wrong way to do it.  You actually make a hole in the shield by pushing the braid aside and then pull the center conductor through that hole unless the cable is such that it's so poorly designed it won't allow that.