CSU/DSU's

Are CSU/DSU's located on the customer's premises? or are they located at the ISP?
And if they are located on your premises, the other one is located at the ISP as well?

Which illustration does the circuit look like?

Example:

A:
YOU

(Router)

(CSU/DSU)--ISP

OR

B:
YOU----(Router)--(CSU/DSU)

(CSU/DSU)--ISP

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Comments

cepera1987

B:
YOU----(Router)--(CSU/DSU)

(CSU/DSU)--ISP

meadIT

DerekAustin26 wrote: »

Are CSU/DSU's located on the customer's premises? or are they located at the ISP?
And if they are located on your premises, the other one is located at the ISP as well?

Which illustration does the circuit look like?

Example:

A:
YOU
(Router)
(CSU/DSU)--ISP

OR

B:
YOU----(Router)--(CSU/DSU)
(CSU/DSU)--ISP

Given A or B, I would have to go with B. We have a CSU/DSU with Verizon's T1 service.

tech-airman

DerekAustin26 wrote: »

Are CSU/DSU's located on the customer's premises? or are they located at the ISP?
And if they are located on your premises, the other one is located at the ISP as well?

Which illustration does the circuit look like?

Example:

A:
YOU
(Router)
(CSU/DSU)--ISP

OR

B:
YOU----(Router)--(CSU/DSU)
(CSU/DSU)--ISP

DerekAustin26,

What does "CSU/DSU" stand for?

DerekAustin26

Channel Service Unit/Data Service Unit...

How do you have all those certs and not know that?

lildeezul

Trust me, he knows that lol....

He was questioning you, becuase he is wondering the same thing.. how dont you know that !

he was just making sure you knew

tech-airman

DerekAustin26 wrote: »

Channel Service Unit/Data Service Unit...

How do you have all those certs and not know that?

DerekAustin26,

That is correct. What is the purpose of the Channel Service Unit/Data Service Unit?

networker050184

DerekAustin26 wrote: »

Channel Service Unit/Data Service Unit...

How do you have all those certs and not know that?

tech-airman likes to help by making others help themselves!

Slowhand

networker050184 wrote: »

tech-airman likes to help by making others help themselves!

Often times, the Socratic Method is the best way for people to cross the threshold from reading/memorizing to learning/understanding.

DerekAustin26

tech-airman wrote: »

DerekAustin26,

That is correct. What is the purpose of the Channel Service Unit/Data Service Unit?

It multiplexes channels and provides synchronous clocking for the digital circuit....

I know what a CSU/DSU is... I just want to know the physical topology of what the full T1 (or greater) would look like. if there is just 1 for your end or just one on the ISP's side or both.

Kaminsky

Don't confuse yourself with the word "premises". It is simply an imaginary, legally contractual line (demark) where you are responsible for any errors on one side and the carrier is reponsible for any errors on the other. On most occasions, the carrier equipment can be on your site including ntu's and even their routers handing over to your routers in cases where they want to monitor the line from your site. Occasionally, this demark can actually occur on their site where you have your own network edges on there instead.

Where equipment actually is, is irrelevant. It's where the your fault, my fault line is that is important.

T1 is just a pipe size (bandwidth) of data flow. What actual kit delivers it can vary greatly and is really down to the carrier for the most part in their negotiations with the customer on how they would like it presented to them. (you'd be amazed at how many different ways this can come in) - you just have to specify the way which would connect to your network the best. I know this leaves it up in the air a bit but, as a data centre comms manager, you could write a book on the different ways that a carrier can present T1 bandwidth to your company.

I know I didn't answer the csu/dsu bit but thought I should point out the reality of the above.

gojericho0

DerekAustin26 wrote: »

It multiplexes channels and provides synchronous clocking for the digital circuit....

I know what a CSU/DSU is... I just want to know the physical topology of what the full T1 (or greater) would look like. if there is just 1 for your end or just one on the ISP's side or both.

It would only be equipped on your side (or integrated within the router itself - see T1 WIC) Its for the benefit of the router so it can understand the signal coming from the CO