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Posted by Pop`ö on October 18, 2006, 12:09 pm
Bob Vaughan wrote:
>> On Mon, 16 Oct 2006 20:39:48 +0000 (UTC), techie@tantivy.tantivy.net
>> (Bob Vaughan) wrote:
>>
>>>>
>>>> I remember someone saying they ought to be called 6P4C and 8P8C
>>>> (and RJ12 is 6P6C, what is 4P4C or 10P10C?). That describes the
>>>> specific connectors, but sounds awkward.
>>>>
>>>
>>>
>>> Actually, RJ-12 only uses 4 conductors, and can use a 6p4c, as can
>>> RJ-13, and RJ-14. RJ-25 uses 3 pairs, and requires a 6p6c.
>>
>> OK, I know the 4c or 6c is the max number of wires, but what does 6p
>> mean, and what does Mark refer to wrt 4P and 10P?
>
>
> Position (maximum number of contact positions)
> Contact (actual number of positions available to be wired)
>
> A 6p4c is a plug sized for a maximum of 6 wiring positions, but with
> only 4 of them having physical contacts. Frequently sized so that a
> maximum of 4 conductor cable will fit in the plug.
>
> You normally only see the mismatched numbering in the 6 position
> plugs. You can get them as 6p2c, 6p4c, and 6p6c.
Everyone seems to have forgotten though that "RJ" defines a lot more than
the number of positions and number of wires; it also defines the intended
use of the plugs and receptacles and which pins are used for what. Specific
examples: RJ-11, RJ31, etc. RJ-11 uses only the two center conductors for
analog services, RJ-31 actually breaks a phone connection and allows one
piece of equipment exclusive use of the telco pair, etc.. There are many RJ
designations.
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Posted by Mark Lloyd on October 18, 2006, 12:16 pm
On Wed, 18 Oct 2006 11:16:22 +0000 (UTC), techie@tantivy.tantivy.net
(Bob Vaughan) wrote:
>>On Mon, 16 Oct 2006 20:39:48 +0000 (UTC), techie@tantivy.tantivy.net
>>(Bob Vaughan) wrote:
>>
>>>>
>>>>I remember someone saying they ought to be called 6P4C and 8P8C (and
>>>>RJ12 is 6P6C, what is 4P4C or 10P10C?). That describes the specific
>>>>connectors, but sounds awkward.
>>>>
>>>
>>>
>>>Actually, RJ-12 only uses 4 conductors, and can use a 6p4c, as can
>>>RJ-13, and RJ-14. RJ-25 uses 3 pairs, and requires a 6p6c.
>>
>>OK, I know the 4c or 6c is the max number of wires, but what does 6p
>>mean, and what does Mark refer to wrt 4P and 10P?
>
>
>Position (maximum number of contact positions)
>Contact (actual number of positions available to be wired)
>
>A 6p4c is a plug sized for a maximum of 6 wiring positions, but with
>only 4 of them having physical contacts. Frequently sized so that a
>maximum of 4 conductor cable will fit in the plug.
>
>You normally only see the mismatched numbering in the 6 position plugs.
>You can get them as 6p2c, 6p4c, and 6p6c.
I think I've seen a 4P2C once.
--
68 days until the winter solstice celebration
Mark Lloyd
http://notstupid.laughingsquid.com
"God was invented by man for a reason, that
reason is no longer applicable."
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Posted by Mark Lloyd on October 14, 2006, 10:34 pm
On Sat, 14 Oct 2006 21:52:22 -0400, "CraigT"
>I plan on installing a VOIP setup in my house.
>
>The problem is that the phone wiring that enters the house is 8 conductor
>and is hardwired to the phone distribution center.
They often do use cat5 for phone now, but the wires are probably all
unused except for one pair (pins 4&5 on a RJ45 jack), as needed for
phone. The extra ones could be useful in the future (maybe you'll want
another phone line). You should not use the same cables for ethernet.
> So, I figure I can break
>into that incoming line and install a couple of cat5 8 conductor female
>plugs on the two severed ends and can use a cat5 patch cord to connect them
>if I ever want to go back to the teleco. But, that would only happen if I
>sell the house.
>
Or that VOIP company went out of business. That sort of thing does
happen.
>The question I have is: Can I plug in a normal rj11 modular plug (coming
>from the modem) into the female rj45 jack that I'll be installing upstream
>from the distribution center and expect those 4 conductors in the plug to be
>aligned with the appropriate conductors in the rj45 jack? The phone modem
>only has rj11 plugs.
>
You can plug a RJ11 plug into a RJ45 jack. The shape of the
plugs/jacks forces them to be centered. Pins 2&3 or a RJ11 plug (those
normally used by a telephone) will connect to 4&5 or the RJ45 jack.
BTW, I was just in Lowe's and noticed they were only selling RJ12
connectors. A RJ12 is the same size as a RJ11, but has all 6
connections. RJ12 connectors can be used for phone with no problems,
and fit into RJ45 jacks too. Pins 2-5 on a RJ12 match pins 1-4 on a
RJ11. RJ12 does require a different crimping tool.
>
>BTW-I know I'll only be able to hook up one phone (an expandable wireless
>system) to this setup. I just want to make my setup easy to undo when I
>move.
>
Never heard of these little things you plug in a jack and it makes
two? Expandable cordless phones are still a good idea. I see some for
sale that allow up to 10 handsets (I think Wal-Mart has one for about
$100 with 3 handsets and you can add up to 7 more for $30 each).
>
>
>
--
72 days until the winter solstice celebration
Mark Lloyd
http://notstupid.laughingsquid.com
"Unlike biological evolution. 'intelligent design' is
not a genuine scientific theory and, therefore, has
no place in the curriculum of our nation's public
school classes." -- Ted Kennedy
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Posted by Jim Redelfs on October 15, 2006, 12:08 am
> Expandable cordless phones are still a good idea. I see some for
> sale that allow up to 10 handsets (I think Wal-Mart has one for about
> $100 with 3 handsets and you can add up to 7 more for $30 each).
A houseful of cordless phones driven by VOIP.
Now *THAT'S* flaky. (Or likely to be.)
It could be worse: It could all be driven by satellite receiver.
Now that's REALLY flaky.
You'd be surprised at how many users soon reject the foibles of VOIP and
return to an old-fashioned land line.
--
:)
JR
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Posted by on October 15, 2006, 12:44 am
>
>> Expandable cordless phones are still a good idea. I see some for
>> sale that allow up to 10 handsets (I think Wal-Mart has one for about
>> $100 with 3 handsets and you can add up to 7 more for $30 each).
>
> A houseful of cordless phones driven by VOIP.
>
> Now *THAT'S* flaky. (Or likely to be.)
>
> It could be worse: It could all be driven by satellite receiver.
>
> Now that's REALLY flaky.
>
> You'd be surprised at how many users soon reject the foibles of VOIP and
> return to an old-fashioned land line.
Chuckle. My employers are currently running VOIP phones over portable sat
links at multiple sites- three guesses where- and we are currently dealing
with a vendor for a micro-cell setup to run either private cell phones or
long-distance cordless phones, hung off the same setup as the current
PC-based VOIP phones.
Sound quality and reliability are less than optimum, but when you set up
where there IS no local infrastructure, options are limited. Multiple hops
halfway around the world, to call ten miles away, doesn't make for a great
connection. No, you really don't wanna know how much it costs.
aem sends....
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Page 4 of 8 < 1 2 3 > last >>
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