What is the difference between modem and CSU/DSU device ?

What is the difference between modem and CSU/DSU device ? both used at the customer premises and generally supplied by ISP for the WAN connectivity. Are both same ? Thanks!
beer9Asked:
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jfer0x01Commented:
Hello,

modem stands for modular/demodulator - it basically convert digital to analog signals and vice-versa

a  CSU/DSU device that converts digital frames into a WAN frame, normally found in T-1's

Basically, they are the same thing, but a CSU/DSU is a more concert device while a modem refers to a concept

Jfer
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jfer0x01Commented:
Err

meant to say concrete not concert
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beer9Author Commented:
Thank you :-)
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