Question about SDSL csu/dsu, is it a layer 1 or layer 2 device?

Answered Question
Jan 18th, 2008
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I checked the following link.

http://www.cisco.com/en/US/tech/tk1330/tsd_technology_support_technical_reference_chapter09186a0080759754.html

T1 CSU/DSU and modem are layer 1 device

NIC is a layer 2 device, but SDSL module card requires an external modem.

What layer device ADSL and SDSL module, layer 1 or 2 device?



Correct Answer by JORGE RODRIGUEZ about 9 years 6 months ago

ADSL, SDSL, DSL are layer 1 , you may also find more detailed information at the ITU-T link bellow.


http://www.dslforum.org/aboutdsl/adsl_tutorial.html


http://www.itu.int/ITU-T/



Rgds

Jorge


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