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They are usee to connect terminal equipment<br />
<a href="http://en.m.wikipedia.org/wiki/CSU/DSU" rel="ugc">http://en.m.wikipedia.org/wiki/CSU/DSU</a>
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They are usee to connect terminal equipment
http://en.m.wikipedia.org/wiki/CSU/DSU [http://en.m.wikipedia.org/wiki/CSU/DSU]

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Since you're doing a lab, you may also want to take a read of its application on the Cisco website<br />
<a href="http://www.cisco.com/en/US/prod/collateral/routers/ps221/product_data_sheet09186a00801a9184.html" rel="ugc">http://www.cisco.com/en/US/prod/collateral/routers/ps221/product_data_sheet09186a00801a9184.html</a>
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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 [http://www.cisco.com/en/US/prod/collateral/routers/ps221/product_data_sheet09186a00801a9184.html]

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Hi Don,<br />
<br />
Thanks for your reply. If I remove the modules, what other modules would you recommend for my studying?
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Hi Don,

Thanks for your reply. If I remove the modules, what other modules would you recommend for my studying?

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Depends on what you want to do (and what's available). For example, if you need more LAN ports, &nbsp;you could get Ethernet modules or Ethernet &nbsp;switching modules.
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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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<div class="content wysiwyg-content">
Hi,<br />
<br />
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<br />
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.
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</div>


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.

What is T1 DSU/CSU used for?

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.

Networking Hardware-Other

IT Administration is the processes and best practices for programming and development, and incorporates methodologies for managing activities and projects. Common methodologies include waterfall, prototyping, iterative and incremental development, spiral development, rapid application development, extreme programming and various types of agile methodology. The life-cycle "model" is a more general term for a category of methodologies, and a software development "process" a more specific term to refer to a specific process chosen by a specific organization.

IT Administration

Transmission Control Protocol/Internet Protocol (TCP/IP) is the set of networking protocols that define end-to-end connectivity specifying how data should be packeted, addressed, transmitted, routed and received at the destination. This functionality is organized into four abstraction layers which are used to sort all related protocols according to the scope of networking involved.