sundance-communications.com/forum Forums TDM Business Telephone Systems NEC Telephones & Systems RJ45 line cords instead of RJ11s

I think there has been a bit of a misunderstanding regarding the phrase 'structured cabling'. Most all of us will exude a bit of resistance when referring to the residential products out there. I'm going to have to agree that those things are dead-end and useless, since even the homeowners who buy them have no clue as to their use or purpose. These systems are simply sales gimmicks that builders use to lead a customer to believe that the thousand$ of dollars that are factored into their mortgage payment is a good thing.

My take is that the references to 'structured cabling' are more in line with commercial installations, like racks, patch panels, etc. Therein lies the difference...... And it is a big one.

doesn't BICSI spec out 8p8c 568a for residential ?

It seems like I read that somewhere

Skip:

TIA/EIA-570-A 7.2.4.2

"The eight-position telecommunications outlet/connector shall meet the modular interface requirements of IEC 60603-7. The pin-pair assignment configuration of the eight-position telecommunications outlet/connector shall comply with T568A as sepcified in ANSI/TIA/EIA-568-A"...blah...blah...blah.

We all know "they" chose 568A to make the wiring backwards compatible because pair 1 connects to the center pins (4 and 5) of the 8P8C connector in both T568A and T568B, both standards are compatible with the first line of RJ11, RJ14, RJ25, and RJ61 connectors that all have the first pair in the center pins of these connectors.

If the second line of an RJ14, RJ25 or RJ61 plug is used, it connects to pair 2 (orange/white) of jacks wired to T568A but to pair 3 (green/white) in jacks wired to T568B. This makes T568B potentially confusing in telephone applications.

Because of different pin pairings, the RJ25 and RJ61 plugs cannot pick up lines 3 or 4 from either T568A or T568B without splitting pairs. This would most likely result in unacceptable levels of hum, crosstalk and noise.

Try this wiring in an existing house that has four-conductor wiring? OOPS! your house isn't TIA/EIA compliant...want to bet what the home-owner thinks of this?

The only Resi- I do is my own and let the buyer-b-ware

I don't even do mine since I no longer have a land line Dean , I recall seeing it somewhere and your right its just a way to sell upgrades

thanks

paul i almost support what your saying but it seems that the rest of the world is not doing what we do in oz and nz.

My suggestion would be to ask for the jacks that dont ruin the 8p8c "rj45" sockets so 6p4c "rj11". the best way to describe it is with a link https://www.accesscomms.com.au/products/P2150.htm
the link shows 6p6c but as a said above 6p4c is what nec could supply

"6P modular plug with slots to accommodate pins 1 and 8 of an 8P8C socket. The slots allow greater compatibility with 8P8C sockets"

ill add that this then makes no change to the size of the jack and is still suitable to all markets supplyed with the modular cord.

i have seen many other cords with these and we ifact buy the 6p4c with slots to accommodate pins 1 and 8 of an 8P8C sockets to make line cords

Hi delsar_delsar.

NECA showed us some samples of these about 6 years ago then they decided not to proceed with them but said we could buy them as extra cost. They have now said the same thing about the line cords with RJ45s on them.. we can pay extra to buy them as well. Most of the non NEC analog fones we buy in for installation have both RJ11 and RJ45 line cords in the same box. NEC seems to be the hold out..