RJ45 to RJ11/12 connections.

A friend has a Samsung laptop with what appears to be a network
interface connector on the modem card and he wants to try connecting it
to his PC.
I haven't seen it yet so I'm not sure it's really a network connector
but I want to make a patch lead up before I go to see him (he lives some
distance away). The connector is only a 6pin RJ11/12 and I don't know
which 6 of the usual 8 wires to connect - the other end will have a RJ45
connector and will plug-in to a standard PC (so I'll need to cross-over
the connections). Does anyone know which wires I need to use or the URL
of a web page where I can find the information?

Thanks in advance.
--
Mike

In message <(E-Mail Removed)>, Ian
Northeast <(E-Mail Removed)> writes
>Mike wrote:
>>
>> A friend has a Samsung laptop with what appears to be a network
>> interface connector on the modem card and he wants to try connecting it
>> to his PC.
>> I haven't seen it yet so I'm not sure it's really a network connector
>> but I want to make a patch lead up before I go to see him (he lives some
>> distance away). The connector is only a 6pin RJ11/12
>
>This doesn't sound like a network connection. Network connections are
>almost always RJ45 these days. I suspect it's the modem's phone
>connection.
>
That was my first thought but he seems to think it's a ethernet
connection. I'll have to take a look at it (and the manual) myself.

>There are some cards which provide both modem and ethernet but these
>either have RJ45 sockets or a dongle which provides one.
>
>Of course if he's counted the pins wrongly and it is an RJ45 network
>connection you'll just need a normal CAT5 crossover cable.
>
I'm pretty sure it's not an RJ45 because he says it's the same size as
the on that connect to the 'phone line - a 'phone output sounds the most
likely.
I'm also fairly confident he can count up to (at least) 8, but I will
check <g>

Thanks for the reply.

--
Mike

In message <(E-Mail Removed)>, ynotssor
<(E-Mail Removed)> writes
>In article <2YwXw0OqFxB$(E-Mail Removed)> Mike
><(E-Mail Removed)> wrote:
>
>> A friend has a Samsung laptop with what appears to be a network
>> interface connector on the modem card and he wants to try connecting it
>> to his PC.
>> I haven't seen it yet so I'm not sure it's really a network connector
>> but I want to make a patch lead up before I go to see him (he lives some
>> distance away). The connector is only a 6pin RJ11/12 and I don't know
>> which 6 of the usual 8 wires to connect - the other end will have a RJ45
>> connector and will plug-in to a standard PC (so I'll need to cross-over
>> the connections). Does anyone know which wires I need to use or the URL
>> of a web page where I can find the information?
>
>When you say "modem card" wrt a laptop, do you mean a PCMCIA card? Most
>laptops have a modem port iand network connection as an integral part of
>the backplane.
>
I said "modem card" because I'm more used to bigger machines (towers and
desktops). I haven't seen this laptop yet but I don't think the
connectors are on a PCMCIA card. Are these integral network connectors
usually RJ45 or RJ11?

>Some computers have 2 RJ11 ports, one for modem and one for a physical
>telephone unit, so that the phone can be used when the modem is offline.
>Unusual in a laptop to be sure, but something worth considering.
>
Yes, I thought it was probably a 'phone connector but my friend thinks
it's a network connection. Given what you say, above, he could be
right.

Presuming it is a network connector, how should I connect up a RJ45 to
RJ11/12 crossover lead for it? I wasn't too worried about the laptop
having only 6 connections (rather that 8) because AIUI only two pairs
are used but I'm not sure which two. Usually I connect all 8.
>
--
Mike

Mike wrote:

> In message <(E-Mail Removed)>, ynotssor
> <(E-Mail Removed)> writes
>>In article <2YwXw0OqFxB$(E-Mail Removed)> Mike
>><(E-Mail Removed)> wrote:
>>
>>> A friend has a Samsung laptop with what appears to be a network
>>> interface connector on the modem card and he wants to try connecting
>>> it to his PC.
>>> I haven't seen it yet so I'm not sure it's really a network
>>> connector but I want to make a patch lead up before I go to see him
>>> (he lives some
>>> distance away). The connector is only a 6pin RJ11/12 and I don't
>>> know which 6 of the usual 8 wires to connect - the other end will
>>> have a RJ45 connector and will plug-in to a standard PC (so I'll
>>> need to cross-over
>>> the connections). Does anyone know which wires I need to use or the
>>> URL of a web page where I can find the information?
>>
>>When you say "modem card" wrt a laptop, do you mean a PCMCIA card?
>>Most laptops have a modem port iand network connection as an integral
>>part of the backplane.
>>
> I said "modem card" because I'm more used to bigger machines (towers
> and
> desktops). I haven't seen this laptop yet but I don't think the
> connectors are on a PCMCIA card. Are these integral network
> connectors usually RJ45 or RJ11?
>
>>Some computers have 2 RJ11 ports, one for modem and one for a physical
>>telephone unit, so that the phone can be used when the modem is
>>offline. Unusual in a laptop to be sure, but something worth
>>considering.
>>
> Yes, I thought it was probably a 'phone connector but my friend thinks
> it's a network connection. Given what you say, above, he could be
> right.
>
> Presuming it is a network connector, how should I connect up a RJ45 to
> RJ11/12 crossover lead for it? I wasn't too worried about the laptop
> having only 6 connections (rather that 8) because AIUI only two pairs
> are used but I'm not sure which two. Usually I connect all 8.
>>

I think Belkin makes a RJ12 to RJ45 adapter. (Don't ask me why.)

But do you really want to try this without having the specs for the
modem card?

In message <AkGNa.69959$(E-Mail Removed) gers.com>,
Clive Dove <(E-Mail Removed)> writes
>Mike wrote:
>
>> Presuming it is a network connector, how should I connect up a RJ45 to
>> RJ11/12 crossover lead for it? I wasn't too worried about the laptop
>> having only 6 connections (rather that 8) because AIUI only two pairs
>> are used but I'm not sure which two. Usually I connect all 8.
>>>
>
>I think Belkin makes a RJ12 to RJ45 adapter. (Don't ask me why.)
>
Probably for the purpose I want one for

>But do you really want to try this without having the specs for the
>modem card?
>
I'll read the manual before I start hooking anything up. <g> I just
wanted to know the pin-to-pin connections for a RJ11/12 to RJ45 lead so
I could make one up.

--
Mike

Mike wrote:

> Yes, I thought it was probably a 'phone connector but my friend thinks
> it's a network connection. Given what you say, above, he could be
> right.
>

What does the computer manual say?

--

Fundamentalism is fundamentally wrong.

To reply to this message, replace everything to the left of "@" with
james.knott.

In message <%JHNa.63833$(E-Mail Removed) ogers.com>,
James Knott <(E-Mail Removed)> writes
>Mike wrote:
>
>> Yes, I thought it was probably a 'phone connector but my friend thinks
>> it's a network connection. Given what you say, above, he could be
>> right.
>>
>
>What does the computer manual say?
>
That's something I'll have to read when I go to see him. First off I
just wanted to make up a RJ12 to RJ45 lead. I'll probably just take my
crimps and connectors along and make the lead up there: if I can work
out the pin-out from the manual. I was hoping it would be a well-known
standard.
--
Mike

Mike <(E-Mail Removed)> said:
>A friend has a Samsung laptop with what appears to be a network
>interface connector on the modem card and he wants to try connecting it
>to his PC.
>I haven't seen it yet so I'm not sure it's really a network connector
>but I want to make a patch lead up before I go to see him (he lives some
>distance away). The connector is only a 6pin RJ11/12 and I don't know
>which 6 of the usual 8 wires to connect - the other end will have a RJ45
>connector and will plug-in to a standard PC (so I'll need to cross-over
>the connections). Does anyone know which wires I need to use or the URL
>of a web page where I can find the information?

Like the others, I suspect that the connector is not LAN.

But still, I've seen one place where (10Mbit/s) Ethernet was provided
with 4-connector RJ11 wall sockets - but then, this was legacy even
back then (roughly five years ago). I guess the wiring was some in-house
agreement; the network people there did provide the patch cables from
the wall socket to the regular RJ45 on the machines. So, nowhere and
never I've seen RJ11 as a Ethernet connector on the computer side.
--
Wolf a.k.a. Juha Laiho Espoo, Finland
(GC 3.0) GIT d- s+: a C++ ULSH++++$ P++@ L+++ E- W+$@ N++ !K w !O !M V
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"...cancel my subscription to the resurrection!" (Jim Morrison)

a user wrote:

> In article, James Knott wrote:
>> a user wrote:
>>
>>> I found a rj45 to db9 adapter on the site and the store had it in stock,
>>> easily. I also saw some rj11/12 to rj45 and reverse adapters at the
>>> Fry's store.
>>
>> Those adapters are used for running serial ports over "flat satin" phone
>> cables.
>>
> Not necessarily. It appears one end of the adapter is not wired and one
> can connect the pins as one desires.
>
> I've even read someone doesn't like phone wires and just use RJ11/RJ45
> adapters to change the phones to use cat5 cable and shows how to do it
> on his webpage. My usage of a RJ45/DB9 adapter is to connect the
> computer serial port to the Home-Theater receiver's serial port that
> is a RJ45 jack; in fact, my cable box has a RJ45 jack but don't know
> how it is being used as no documents appear to be available.

Your example proves my point of using those DE9 ("DB9" is the wrong term for
those connectors) for connecting serial ports. What other commonly used
devices have those connectors? RJ11/RJ45 is a different matter, as some
phone equipment uses other than RJ11 etc. I have seen RJ45 or similar used
for ethernet, token ring, DS1 (T1) connections, leased line modems, some
digital PBX phones etc.

--

Fundamentalism is fundamentally wrong.

To reply to this message, replace everything to the left of "@" with
james.knott.

In message <be8pf5$itp$(E-Mail Removed)-int>, Juha Laiho
<(E-Mail Removed)> writes
>
>Like the others, I suspect that the connector is not LAN.
>
I certainly have my doubts.

>But still, I've seen one place where (10Mbit/s) Ethernet was provided
>with 4-connector RJ11 wall sockets - but then, this was legacy even
>back then (roughly five years ago). I guess the wiring was some in-house
>agreement; the network people there did provide the patch cables from
>the wall socket to the regular RJ45 on the machines. So, nowhere and
>never I've seen RJ11 as a Ethernet connector on the computer side.

Only 4 connections are (were?) needed - 1 transmit pair and 1 receive
pair so its just a matter of assigning the pins. I was hoping there was
a standard for using a RJ11/12 so I could make a lead up before I went
to see him. I'll have to see what it says in the manual.
--
Mike