CSU/DSU's
DerekAustin26
Member Posts: 275
in CCNA & CCENT
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
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
Comments
-
meadIT
Member Posts: 581 ■■■■□□□□□□
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.CERTS: VCDX #110 / VCAP-DCA #500 (v5 & 4) / VCAP-DCD #10(v5 & 4) / VCP 5 & 4 / EMCISA / MCSE 2003 / MCTS: Vista / CCNA / CCENT / Security+ / Network+ / Project+ / CIW Database Design Specialist, Professional, Associate -
tech-airman
Member Posts: 953
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
Member Posts: 275
Channel Service Unit/Data Service Unit...
How do you have all those certs and not know that? -
lildeezul
Member Posts: 404
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 knewNHSCA National All-American Wrestler 135lb -
tech-airman
Member Posts: 953
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
Mod Posts: 11,962 Mod
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!An expert is a man who has made all the mistakes which can be made. -
Slowhand
Mod Posts: 5,161 Mod
Often times, the Socratic Method is the best way for people to cross the threshold from reading/memorizing to learning/understanding.networker050184 wrote: »tech-airman likes to help by making others help themselves!
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DerekAustin26
Member Posts: 275
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
Member Posts: 1,235
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.Kam. -
gojericho0
Member Posts: 1,059 ■■■□□□□□□□
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
