billp@ames.arc.nasa.gov (Bill W. Putney) (08/31/88)
I'm wiring a new campus for telephone/data. I understand that there is
a new (proposed?) standard for modular connector (RJ-45 - 8 pin) wiring
that is being used by the operating companies. The new standard applies to
intra-building wiring and provides 4 twisted pairs to each jack from an
IDF. The idea is that ISDN is comming and this new wiring plan will
facilitate that implimentation. It is also specified for the physical
layer connections in 10baseT (or so I've heard).
I think BellCore and AT&T calls this the Premise Distribution System (PDS).
I got the idea when I started that "everyone" knew all about this and
that I could just tell the contractor to "wire it to PDS spec." and
like magic it would get wired right. As it turns out nobody knows
what I'm talking about. Nobody knows what pairs go on what pins in
the connector, this is the real problem.
I have about 1000 locations to be wired and need some accurate information
(in a hurry!). Please keep it simple like;
tip pair 1 - pin 5
ring pair 1 - pin 4
...
Thanks in advance.rwhite@ucsd.edu (Robert C. White Jr.) (09/03/88)
in article <telecom-v08i0137m01@vector.UUCP>, unet!billp.unet.pacbell.COM!billp@ames.arc.nasa.gov (Bill W. Putney) says: > Approved: telecom-request@vector.uucp (USENET Telecom Moderator) > X-TELECOM-Digest: volume 8, issue 137, message 1 > X-Submissions-To: telecom@xx.lcs.mit.edu (Mailing List Coordinator) > X-Administrivia-To: telecom-request@vector.uucp (USENET Telecom Moderator) > > I'm wiring a new campus for telephone/data. I understand that there is > a new (proposed?) standard for modular connector (RJ-45 - 8 pin) wiring > that is being used by the operating companies. The new standard applies to > intra-building wiring and provides 4 twisted pairs to each jack from an > IDF. The idea is that ISDN is comming and this new wiring plan will > facilitate that implimentation. It is also specified for the physical > layer connections in 10baseT (or so I've heard). > > tip pair 1 - pin 5 > ring pair 1 - pin 4 > ... How it works here: on the 66 block in your phone room: (repeated for every four pair) 66blk conductor color function 1 blue-white tip 2 blue ring 3 orange-white data out (out?) 4 orange data out (in?) e.g. current loop ish 5 green-white data in (out?) 6 green data in (in?) see above 7 brown-white power1 (rarely used) 8 brown power2 (rarely used) on any modular plug in the system: (meanings the same by color) modular conductor color 1 orange-white 2 orange 3 green-white 4 blue 5 blue-white 6 green 7 brown-white 8 brown You will note the odd jumbling of the color orders for the modular connectors. This keeps the blue pair (tip and ring) in the *center* of the modular jack so that any size plug (4, 6, or 8 wide) will line up these two conductors, thus making it safe to install eight-wide jacks throughout your building. Digital handsets, and hybred handsets use the orange and green pairs. Similarly twisted pair networks use these same conductors, so if you intend to use both digital instruments and a building-wireing lan, you will need two jacks or to do some non-standard wireing. Power 1&2 are for things like lighted keysets and princess phones. I am shure it is also "reserved for future use" Most of the AT&T sanctioned equiptment which combines an anilog(normal) handset and either a digital device *or* a LAN will contain the breakout for the analog set within the digital device. [Starlan cards, for instance, have three jacks; in; out; and phone; and act as the splitter. you plug the board into the wall and your phone into the board.] I punch down all my one network stuff here, and many of the phones related to them. I may have gotten the purpose of the individual conductors in a pair backwards (e.g. reversed tip and ring; or reversed data-in-in and data-in-out) But the color-coding and the wireing concept are correct, and properly in order. The blue and the blue-white are reversed on the modular connecters to keep the white, solid, white, solid... pattern in the connectors. You will also note that on every 66 block, you have 25 pair and the standard only uses the first 24. The last pair is waste unless you do something nonstandard. 50-pin-AMP-to-6-X-4pair-modular connectors are commonly available. If you use the 66blk wiring EVERY TIME, the connections will remain consistant, even if you are making a jack-to-jack connection through your building wiring. The modular spec is for left-to-right when you look at the top of the plug (connector side up/tab down) while holding the wire. (see figure) O O G B B G B B W S W S W S W S [ | | | | | | | | ] [ | | | | | | | | ] [ | | | | | | | | ] [-----------------] [^^^^^^^^^^^^^^^^^] [-----------------] [ ] [-----------------] *** *** Rob.