CAT 5 Installation

Quick question ...

Say I have a 4 port Router/Switch and wish to distribute LAN sockets
around the house. Would this mean I must run the CAT 5e cables in parallel?


Switch 1 ------- socket 1 PC1
2 ------- socket 2 PC2
3 ------- socket 3 PC3
4 ------- socket 4 unused

As the cabling for the most part will follow the same route I wonder if
I can utilize a device or the spare pairs!

Switch 1 (2xRJ45 plugs) ------ socket 1 (2pair with 2pair passthrough)
------ socket 2 (2pair). I know cross talk will play a part so as it's
not Gbit LAN doubt it'll be an issue.

568B Wiring

1. Tx+
2. Tx-
3. Rx+
4. NC
5. NC
6. Rx-
7. NC
8. NC

If I utilized the free pairs how would pins 4,5,7 & 8 be defined i.e
which would be Tx+ etc so as to reduce cross talk etc

TIA (excuse the long winded post)

In article <w3Tph.55757$(E-Mail Removed)>, Mr User
(E-Mail Removed) says...
>
> As the cabling for the most part will follow the same route I wonder if
> I can utilize a device or the spare pairs!

Better to relocate the switch to minimise the amount of cable you have
to run.
>
> If I utilized the free pairs how would pins 4,5,7 & 8 be defined i.e
> which would be Tx+ etc so as to reduce cross talk etc
>

You just have to preserve the pairings, but you can get adapters that
will save messing around:

http://www.lindy.com/uk/productfolde...4002/index.php

Rob Morley wrote:
> In article <w3Tph.55757$(E-Mail Removed)>, Mr User
> (E-Mail Removed) says...
>> As the cabling for the most part will follow the same route I wonder if
>> I can utilize a device or the spare pairs!
>
> Better to relocate the switch to minimise the amount of cable you have
> to run.
>> If I utilized the free pairs how would pins 4,5,7 & 8 be defined i.e
>> which would be Tx+ etc so as to reduce cross talk etc
>>
>
> You just have to preserve the pairings, but you can get adapters that
> will save messing around:
>
> http://www.lindy.com/uk/productfolde...4002/index.php

Preserve the pairing makes perfect sense. I have no need for a port
doubler 1. I have enough Switch ports. 2. The physical
location of both remote sockets are different.

So ..

568B Wiring

1. Tx+ 1 W/O --------- SKT1 ------------------- NC
2. Tx- 1 O/W --------- SKT1 ------------------- NC
3. Rx+ 1 W/G --------- SKT1 ------------------- NC
4. TRD2+ Bl/W ----------Passthru----------------- SKT2
5. TRD2- W/Bl ----------Passthru----------------- SKT2
6. Rx- 1 G/W --------- SKT1 ------------------- NC
7. TRD3+ W/Br ----------Passthru----------------- SKT2
8. TRD3- Br/W ----------Passthru----------------- SKT2
7 Metres 10 Metres

Passthru means pairs pass unbroken without where possible touching the
CAT5e twists.

Thanks

In article <rf0qh.52052$(E-Mail Removed)>, Mr User
(E-Mail Removed) says...
> Rob Morley wrote:
> > In article <w3Tph.55757$(E-Mail Removed)>, Mr User
> > (E-Mail Removed) says...
> >> As the cabling for the most part will follow the same route I wonder if
> >> I can utilize a device or the spare pairs!
> >
> > Better to relocate the switch to minimise the amount of cable you have
> > to run.
> >> If I utilized the free pairs how would pins 4,5,7 & 8 be defined i.e
> >> which would be Tx+ etc so as to reduce cross talk etc
> >>
> >
> > You just have to preserve the pairings, but you can get adapters that
> > will save messing around:
> >
> > http://www.lindy.com/uk/productfolde...4002/index.php
>
> Preserve the pairing makes perfect sense. I have no need for a port
> doubler 1. I have enough Switch ports. 2. The physical
> location of both remote sockets are different.

The doubler doesn't work on switch ports, just on the cable. You use
one doubler at the switch end to connect two switch ports to one fully-
wired RJ45 socket, then a doubler at the other end splits the other
single socket into two for connection to the PCs. The advantage of this
is that you have standard wiring should you want to use it for a single
gigabit connection (and to avoid any other confusion that might arise as
a result of using a non-standard wiring scheme).
>
> So ..
>
> 568B Wiring
>
> 1. Tx+ 1 W/O --------- SKT1 ------------------- NC
> 2. Tx- 1 O/W --------- SKT1 ------------------- NC
> 3. Rx+ 1 W/G --------- SKT1 ------------------- NC
> 4. TRD2+ Bl/W ----------Passthru----------------- SKT2
> 5. TRD2- W/Bl ----------Passthru----------------- SKT2
> 6. Rx- 1 G/W --------- SKT1 ------------------- NC
> 7. TRD3+ W/Br ----------Passthru----------------- SKT2
> 8. TRD3- Br/W ----------Passthru----------------- SKT2
> 7 Metres 10 Metres
>
> Passthru means pairs pass unbroken without where possible touching the
> CAT5e twists.
>
That would work, but why not just run the cable between a couple of
double surface sockets, and use patch leads to connect to those?

In message <w3Tph.55757$(E-Mail Removed)>, Mr User
<(E-Mail Removed)> writes
>Quick question ...
>
>Say I have a 4 port Router/Switch and wish to distribute LAN sockets
>around the house. Would this mean I must run the CAT 5e cables in
>parallel?
>
>
>Switch 1 ------- socket 1 PC1
> 2 ------- socket 2 PC2
> 3 ------- socket 3 PC3
> 4 ------- socket 4 unused
>
>As the cabling for the most part will follow the same route I wonder if
>I can utilize a device or the spare pairs!

In theory you can connect two plugs at one end of the cable and two
sockets at the other, using all of the conductors. You may have a
problem with crosstalk between the two sets, which could affect
transmission speeds. I've seen reports of such problems.

A more usual approach would be to run one cable, use one pair, and then
plug in a second switch at the far end. You then run further standard
cables from that switch.



--
Bernard Peek
back in search of cognoscenti

"Rob Morley" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) t...
> In article <rf0qh.52052$(E-Mail Removed)>, Mr User
> (E-Mail Removed) says...
> > Rob Morley wrote:
> > > In article <w3Tph.55757$(E-Mail Removed)>, Mr User
> > > (E-Mail Removed) says...
> > >> As the cabling for the most part will follow the same route I wonder
if
> > >> I can utilize a device or the spare pairs!
> > >
> > > Better to relocate the switch to minimise the amount of cable you have
> > > to run.
> > >> If I utilized the free pairs how would pins 4,5,7 & 8 be defined i.e
> > >> which would be Tx+ etc so as to reduce cross talk etc
> > >>
> > >
> > > You just have to preserve the pairings, but you can get adapters that
> > > will save messing around:
> > >
> > > http://www.lindy.com/uk/productfolde...4002/index.php
> >
> > Preserve the pairing makes perfect sense. I have no need for a port
> > doubler 1. I have enough Switch ports. 2. The physical
> > location of both remote sockets are different.
>
> The doubler doesn't work on switch ports, just on the cable. You use
> one doubler at the switch end to connect two switch ports to one fully-
> wired RJ45 socket, then a doubler at the other end splits the other
> single socket into two for connection to the PCs. The advantage of this
> is that you have standard wiring should you want to use it for a single
> gigabit connection (and to avoid any other confusion that might arise as
> a result of using a non-standard wiring scheme).

just to be clear - GigE on UTP uses all 4 pairs.

So a pair doubler is only going to work for 10/100 Ethernet.

a 10/100/1000 port will only connect at a lower speed.
> >
> > So ..
> >
> > 568B Wiring
> >
> > 1. Tx+ 1 W/O --------- SKT1 ------------------- NC
> > 2. Tx- 1 O/W --------- SKT1 ------------------- NC
> > 3. Rx+ 1 W/G --------- SKT1 ------------------- NC
> > 4. TRD2+ Bl/W ----------Passthru----------------- SKT2
> > 5. TRD2- W/Bl ----------Passthru----------------- SKT2
> > 6. Rx- 1 G/W --------- SKT1 ------------------- NC
> > 7. TRD3+ W/Br ----------Passthru----------------- SKT2
> > 8. TRD3- Br/W ----------Passthru----------------- SKT2
> > 7 Metres 10 Metres
> >
> > Passthru means pairs pass unbroken without where possible touching the
> > CAT5e twists.
> >
> That would work, but why not just run the cable between a couple of
> double surface sockets, and use patch leads to connect to those?
--
Regards

(E-Mail Removed) - replace xyz with ntl

In message <w3Tph.55757$(E-Mail Removed)>, Mr User
<(E-Mail Removed)> writes
>Quick question ...
>
>Say I have a 4 port Router/Switch and wish to distribute LAN sockets
>around the house. Would this mean I must run the CAT 5e cables in
>parallel?

Yes unless you use another switch.
>
>
>Switch 1 ------- socket 1 PC1
> 2 ------- socket 2 PC2
> 3 ------- socket 3 PC3
> 4 ------- socket 4 unused
>
snip
>
>If I utilized the free pairs how would pins 4,5,7 & 8 be defined i.e
>which would be Tx+ etc so as to reduce cross talk etc
>
At 100MHz only the orange and green pairs are used. You can hang another
socket on the unused pairs say substituting blue for green and brown for
orange. This isn't standard practise and isn't recommended however in
practise I have never seen it not work.
--
Devs
"Punchdown Pete the old Kroner"