What is T1 DSU/CSU used for?

Hi,

I am thinking of purchasing 2 used Cisco routers for my lab and I noticed that on one of the routers, it has a T1 DSU/CSU
and on the other route it has 2 T1 DSU/CSU. I was wondering what these are used for as I've never seen these before? Thanks.
techin4Asked:
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R_EdwardsCommented:
They are usee to connect terminal equipment
http://en.m.wikipedia.org/wiki/CSU/DSU
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Natty GregIn Theory (IT)Commented:
Since you're doing a lab, you may also want to take a read of its application on the Cisco website
http://www.cisco.com/en/US/prod/collateral/routers/ps221/product_data_sheet09186a00801a9184.html
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Don JohnstonInstructorCommented:
They are used for connecting to a T1 leased line.  These are 1.5mbp/s services that telco's provide for when you want to connect two geographically separate locations together.

They used to be very common.  Now, not so much.

If you're building a lab for certification, the concept is still taught, but the actual configuration isn't.

If you're getting a good price on the routers, you can simply not use the CSU/DSU modules or you can remove the modules and install other modules.  If you remove them, you may be able to find a buyer for them on eBay and recoup some of the cost.
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techin4Author Commented:
Hi Don,

Thanks for your reply. If I remove the modules, what other modules would you recommend for my studying?
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Don JohnstonInstructorCommented:
Depends on what you want to do (and what's available). For example, if you need more LAN ports,  you could get Ethernet modules or Ethernet  switching modules.
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madunixCommented:
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