Extending a demarc to server room - need help
Extending a demarc to server room - need help
(OP)
My company is moving to a new building. I'm the onsite IT tech and I'm trying to work with our cabling company to get the 3 T1's extended from demarc to server room. Our corporate IT group said that I should have them mount a 12 port patch panel on board in demarc room and then use 25 pair cat5 cable to pulled over to server room, terminated on another 12 port patch panel. Ports 1-3 will be used for the 3 T1's we're installing. 4-12 will be for future growth. The problem I'm having is that the cabling company we are using typically does residential work (not my first choice) so they're not entirely familiar with the concept of "extending demarcs" and unfortunately, while I understand the concept, I've never actually been involved in doing it. I need to explain to these guys exactly how to punch it down and that's the part I don't know. I've punched down tons of regular 4 pair cat5 ethernet on patch panels and wall jacks.
I'm just not sure what to do with the 25 pair cable on a 12 port patch panel. If I understand it correctly, the T1's only use 2 pair, so are there 2 pair punched down for each port x 12 ports equals 24 pair with one pair left over? Or do I have that wrong? If I've got it right, which 4 termination points (of 1-8) are used to punch down on, on the back of the patch panel?
Hopefully I've explained my problem accurately and not caused any confusion?
Can anybody help me understand?
Thanks!
I'm just not sure what to do with the 25 pair cable on a 12 port patch panel. If I understand it correctly, the T1's only use 2 pair, so are there 2 pair punched down for each port x 12 ports equals 24 pair with one pair left over? Or do I have that wrong? If I've got it right, which 4 termination points (of 1-8) are used to punch down on, on the back of the patch panel?
Hopefully I've explained my problem accurately and not caused any confusion?
Can anybody help me understand?
Thanks!
RE: Extending a demarc to server room - need help
Always look out for the next guy because it may be you!
RE: Extending a demarc to server room - need help
I would also use separate cables instead of 1 cable split up with 2 pairs per jack.
However, what is the distance of the run? Cat-5 isn't really what is spec'ed for T1's, and if you are going to run multiple T1's through one cable, you usually want to separate the transmits from the receives into different cables or at least different binders.
If it's just a short distance, run 12 Cat-5 cables, and punch them to a 12 port patch panel at each, use 568-A or B, just do it the same at each end.
RE: Extending a demarc to server room - need help
Some answers to your questions...the distance is approximately 100-120 feet from demarc to server room.
I tried looking at what current tenants (and the previous in our suite) in the building have done and it's a mix of both. Some have done 1 cat5 per T1 and the previous tenants in our suite look like they ran a 25 pair punched down to a 110 block.
I'm not sure I understand this part - "Cat-5 isn't really what is spec'ed for T1's, and if you are going to run multiple T1's through one cable, you usually want to separate the transmits from the receives into different cables or at least different binders."
So if I'm understanding you guys correctly, I should be able to take the 25 pairs, punch down 2 pair on 1/2 and 4/5 (b standard) for each of the ports on the 12 port panel and be good. With one unused pair left.
I don't understand cabling well enough to know what the difference between running those 25 pairs through one big cable or separating them all out into 4 pairs per cable (a single cat5) x 12 cables, that would all still be within the same proximity of each other going through the conduit?
Thanks again for the replies. It really helps.
RE: Extending a demarc to server room - need help
RE: Extending a demarc to server room - need help
Jeremy J. Carter
Charm City Communications
Avaya/Nortel
Sales. Service. Installation
http://www.charmcitycommunications.com
RE: Extending a demarc to server room - need help
Always look out for the next guy because it may be you!
RE: Extending a demarc to server room - need help
I
"FEATURE 00"
http://mysite.verizon.net/vze7n25t/
RE: Extending a demarc to server room - need help
Quabbin datamax 100 ohm
Search this and you should find them.
Always look out for the next guy because it may be you!
RE: Extending a demarc to server room - need help
I
"FEATURE 00"
http://mysite.verizon.net/vze7n25t/
RE: Extending a demarc to server room - need help
Jim
RE: Extending a demarc to server room - need help
I've been out of town and unable to check the forum.
Couple follow ups - the company we are using mainly does residential work, therefore they are not entirely familiar with doing commercial work, though they say they are. The guys they have doing clearly are not. This was not my choice and is out of my hands so I have to live with it and make the best of it.
I'm having it installed the way our corporate guys told me to and using the company that my local management said I had to use (cost reasons).
At this point, I just have to hope for the best. I'm pretty sure I've got a good enough understanding of it and have explained to them what we're looking for (they brought in another guy who seems to know more about it). Work to be finished today/tomorrow with circuits being turned up in 2 weeks. We'll see how it goes. Thanks for all your help/advice.
RE: Extending a demarc to server room - need help
-CL
RE: Extending a demarc to server room - need help
RE: Extending a demarc to server room - need help
Jim
RE: Extending a demarc to server room - need help
I extended ckts over 300' a couple of months ago using non-shielded cat6 & have not heard any complaints yet. Knock on wood.