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I've never heard of a "Bonded T-1 Line". Is this like a DS1-C, some circuit with a bandwith of about 3 mbs that you will then split into 2 T-1s? Or are you using the 3mbs pipe as one ckt?
This is how it is billed by the carrier.
It's the bandwidth of 3Mb/s on two ckts. Both go into one router. It's our internet pipe, and our PBX uses VOIP to a Co-location.

To Quote Internet dot com
https://www.webopedia.com/TERM/b/bonded_T1.htm
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A bonded T1 (also called DS1) is two or more T1s that have been joined (bonded) together to increase bandwidth.
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When you say "Channel bank", I think you mean a mux (probably a T-3 mux)
You are correct, I am using the wrong term here, and I do apologize.
I mean this thing
https://picasaweb.google.com/lcdpanel/T1Box#5277859238743074210

Is that what this is called? a Mux?
Multiplexer?