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ISDN Hardware

By Shanghai Sam ·
ok, my question is regarding TE1's, TE2's, TA's NT1's and NT2's;I'm aconfused on what kind of devices are these, I know the theorical definition of them from the cisco curriculum but, I would like to know exactly what these devices are, u know like ISDN phones etc.
For example I know that a NT1 is a device that connects four-wire ISDN subscriber wiring to the conventional two-wire local loop facility, ok I understand that but how does it do that? and how does the device look like.
Same question for the other 4 devices!
Perhaps some body can reffer me to a site where they have these info available or eaven better some pictures and specs of the mentioned devices.
Thanks again guys!

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