reelbigfish
IS-IT--Management
We're trying to extend a T1 from one IDF to another with a 300ft cat 5 sriaght trough patch cable. Will this work? What would you recommed? Thanks
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What are the copper standars for a T1 circuit? 4
- Thread starter reelbigfish
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kwing112000
Vendor
I would say in most cases it should work. you may want to think about using shielded cable to help with it. I have seen them work a lot longer than that and seen them have issues shorter. There are a lot of variables that come into play. what is it used for. Data or Voice. What type of equipment is it connecting to.
Kevin Wing
ACA- Implement IP Office
Carousel Industries
Kevin Wing
ACA- Implement IP Office
Carousel Industries
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oldtimerbob
Technical User
You should use T-1 shielded cable for your extension,because of the footage and the requirements for the bandwith,terminate the ends into RJ48X's and then a patch cord at both ends, one to the provider break out box and one to your device.
Yes, we get this question fairly oftem, but since most that ask it are new to the forum, they don't know how to view older threads.
Good Luck,
Has been in the cabling business for about twenty years and is now the Sr PM for a cabling company located in the Los Angeles area.
Also a General Class Amatuer Radio Operator.
Yes, we get this question fairly oftem, but since most that ask it are new to the forum, they don't know how to view older threads.
Good Luck,
Has been in the cabling business for about twenty years and is now the Sr PM for a cabling company located in the Los Angeles area.
Also a General Class Amatuer Radio Operator.
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reelbigfish
IS-IT--Management
We're exteding this PRI to a cisco CMM 2600 applaince/blade. This circuit will be used for voice.
Distance - 200m
I refered to the mentioned "previous thread" referals. Thanks this helps a lot.
Distance - 200m
I refered to the mentioned "previous thread" referals. Thanks this helps a lot.
I've been lurking on several boards reading posts about using CAT5 (or better) for T1 extensions, and it finally hit me that everyone is focusing on the data speed and not the electrical specifications of the signal. I.E. CAT5 supports 100Megabit, why can't (shouldn't) I use it for 1.5Megabit.
Extending the same logic, try convincing an audiophile to replace their microphone cable with CAT5 - "It's good for 100MHz, It'll be fine for audio". While it might seem to work OK for you or me, I'm sure that most audio professionals would never go along and could give you plenty of reasons to use the correct cables.
Ditto here, CAT cable is engineered for the ethernet specifications, and apparently the T1 signal / waveform is more prone to crosstalk / feedback between the transmit and receive pairs.
Extending the same logic, try convincing an audiophile to replace their microphone cable with CAT5 - "It's good for 100MHz, It'll be fine for audio". While it might seem to work OK for you or me, I'm sure that most audio professionals would never go along and could give you plenty of reasons to use the correct cables.
Ditto here, CAT cable is engineered for the ethernet specifications, and apparently the T1 signal / waveform is more prone to crosstalk / feedback between the transmit and receive pairs.
A T1 dmarc extension is serial communication using pins 1,2,4,5
serial as in 20ma current loop, or +/- 15 volt RS232?
While your description is correct as far as it goes, it tells me nothing about how much shielding the signal needs to handle interference between it's own transmit and receive, or with other circuits in the same bundle. From your description I might as well use 4 straight wires as long as I maintained 1 to 1, 2 to 2, etc. (For what it's worth, the last time I was able to look inside the "Smartjack", there actually was about 4 to 6 inches of loose wires between the card edge and the Jack on the bottom)
serial as in 20ma current loop, or +/- 15 volt RS232?
While your description is correct as far as it goes, it tells me nothing about how much shielding the signal needs to handle interference between it's own transmit and receive, or with other circuits in the same bundle. From your description I might as well use 4 straight wires as long as I maintained 1 to 1, 2 to 2, etc. (For what it's worth, the last time I was able to look inside the "Smartjack", there actually was about 4 to 6 inches of loose wires between the card edge and the Jack on the bottom)
mikeydidit
IS-IT--Management
In all honesty, thats all it is coming in from 99% of the teleco's and it works. Unless you are like where I work and have a fiber mux then you are getting your service in on the same 25-600 pair cable along with your telephone numbers. These bundles are not shielded or separated. Most of outside plant cabling coming into your demark is PE cable rated cat noting. A lot of these smartjacks are wired on JKT, which is also cat nothing.
But if you maintain your own stuff and want to do things where the potential for trouble is narrowed down, then use shielded cables to extend your demark. This will "help" cut down on possible interference between this and other circuits. This is just a little bit of added protection not a requirement to make it work.
"A people that values its privileges above its principles soon loses both."
- Dwight D. Eisenhower (1890-1969), Inaugural Address, January 20, 1953
For the best response to a question, read faq690-6594
But if you maintain your own stuff and want to do things where the potential for trouble is narrowed down, then use shielded cables to extend your demark. This will "help" cut down on possible interference between this and other circuits. This is just a little bit of added protection not a requirement to make it work.
"A people that values its privileges above its principles soon loses both."
- Dwight D. Eisenhower (1890-1969), Inaugural Address, January 20, 1953
For the best response to a question, read faq690-6594
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