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Posted by CraigT on October 14, 2006, 9:52 pm
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. 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.
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.
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.
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Posted by Eric on October 14, 2006, 10:20 pm
CraigT wrote:
> 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. 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.
>
> 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.
>
>
> 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.
RJ-45 is for network (ie ethernet), RJ-11 is for telephones. You are not
going to hook your telephone to the network. You are going to hook your
voip phone adapter or voip router to the network ( via an RJ-45 connector )
and then hook your telephone to the voip adapters' RJ-11 telephone port.
Eric
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Posted by Bob Vaughan on October 15, 2006, 8:01 pm
>
>RJ-45 is for network (ie ethernet), RJ-11 is for telephones. You are not
>going to hook your telephone to the network. You are going to hook your
>voip phone adapter or voip router to the network ( via an RJ-45 connector )
>and then hook your telephone to the voip adapters' RJ-11 telephone port.
>
Incorrect.
RJ-45 is for a dedicated single pair data circuit, and has nothing to do
with ethernet.
The connectors themselves do not have any RJ designations until they are
wired for a specific telephone application, as originally defined in
47 CFR 68.502.
The only exceptions might be jacks for alarm applications complying with
RJ-31X or RJ-38X, which have shorting bars, making them difficult to use
for other applications.
Ethernet and Token Ring do not have any RJ designation.
--
-- Welcome My Son, Welcome To The Machine --
Bob Vaughan | techie @ tantivy.net |
| P.O. Box 19792, Stanford, Ca 94309 |
-- I am Me, I am only Me, And no one else is Me, What could be simpler? --
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Posted by CJT on October 15, 2006, 8:14 pm
Bob Vaughan wrote:
>
>>RJ-45 is for network (ie ethernet), RJ-11 is for telephones. You are not
>>going to hook your telephone to the network. You are going to hook your
>>voip phone adapter or voip router to the network ( via an RJ-45 connector )
>>and then hook your telephone to the voip adapters' RJ-11 telephone port.
>>
>
>
> Incorrect.
>
> RJ-45 is for a dedicated single pair data circuit, and has nothing to do
> with ethernet.
>
> The connectors themselves do not have any RJ designations until they are
> wired for a specific telephone application, as originally defined in
> 47 CFR 68.502.
>
I don't see how the CFR can be authoritative in a non-telephone (e.g.
ethernet) context.
> The only exceptions might be jacks for alarm applications complying with
> RJ-31X or RJ-38X, which have shorting bars, making them difficult to use
> for other applications.
>
> Ethernet and Token Ring do not have any RJ designation.
>
>
>
>
--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.
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Posted by Bob Vaughan on October 15, 2006, 9:55 pm
>Bob Vaughan wrote:
>
>>
>> The connectors themselves do not have any RJ designations until they are
>> wired for a specific telephone application, as originally defined in
>> 47 CFR 68.502.
>>
>
>I don't see how the CFR can be authoritative in a non-telephone (e.g.
>ethernet) context.
The RJxx designations are known as a Universal Service Ordering Code (USOC),
and the wiring for specific telephone services was defined in 68.502, along
with the associated USOC. The specification includes the type of jack/plug,
wiring pattern, and signaling.
There is no USOC for ethernet or token ring.
The connectors are obviously used for multiple uses, only some of which
have USOC's, and since the same connectors are used for multiple
USOC's, the connectors themselves do not have a USOC until they
are wired for a specific application.
The specification for the RJ45 USOC is for a keyed 8 position/8 contact
modular jack/plug, wired for a single line, bridged tip/ring, wired on
ping 4/5 of the jack/plug, with a programming resistor wired across pins
7/8 or the wall jack, with a value determined based on loop loss between
the jack and the CO. This allows the connected equipment to set transmit
levels to not exceed -12dBm at the CO.
For comparison, 10/100 ethernet uses an unkeyed 8p8c jack/plug, wired
with one pair across ping 1/2, and the second across 3/6.
Note the lack of any cross-compatibility between RJ45 and 10/100 ethernet.
If properly wired, using the proper connectors, and 2 pair cable, a cable
wired for RJ-45 will not fit into an ethernet jack, nor will there be any
electrical continuity on any of the wires used by ethernet.
The unkeyed 8p8c jack/plug are also used for RJ-31, RJ-38, RJ-61, and others,
and the keyed 8p8c jack/plug is used for RJ-41, RJ-45, RJ-48, etc.
--
-- Welcome My Son, Welcome To The Machine --
Bob Vaughan | techie @ tantivy.net |
| P.O. Box 19792, Stanford, Ca 94309 |
-- I am Me, I am only Me, And no one else is Me, What could be simpler? --
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