| Author |
Message |
Brian
Guest
|
 Posted:
Tue May 24, 2005 12:20 am Post subject:
Gigabit Cabling and Auto-MDIX Problems |
|
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Hi, I am currently attempting to upgrade from 100BaseT, with CAT5 at
home and adding a new link with CAT7 cable, that I want to use for
Gigabit Ethernet. I Bought two Telegaertner double AMJ45 sockets. For a
first test I just cabled the two of them together straight through.
1 White/Orange
2 Orange
3 White/Green
4 Blue
5 White/Blue
6 Green
7 White Brown
8 Brown
At one end is a PC with an Intel 1000 MT Pro NIC, and the other end a
new D-Link DGS-10008D, 8 Port Gigabit switch with Auto-MDIX. SO I have a
patch cable from the switch to the first socket,then the cable run, then
a short patch cable, then the PC. The switch has 3 other PCs connected,
2 at 100BaseT and 1 with the same Intel NIC again. All connected by
short patch cables. The three PCs on the switch can communicate OK. I
get a cable fault shown by the Switch when starting for the new cable
run. I was the opinion that AUTO-MDIX would sort out any problems, at
least with any patch cables. It certainly doesn't work at all.
Here is a link to the sockets I am using.
http://www.voltus.biz/pphlogger/dlcount.php?id=voltusbiz&url=/assets/own/MA_AMJ8_8UP0_Cat6+.pdf
The datasheet with the sockets shows two ways to connect them:
B:
1 White/Orange
2 Orange
3 White/Green
4 Blue
5 White/Blue
6 Green
7 White Brown
8 Brown
and A:
1 White/Green
2 Green
3 White/Orange
4 Blue
5 White/Blue
6 Orange
7 White/Brown
8 Brown
I guess this looks like a cross over. But shouldn't the AUTO-MDIX sort
this out for me?
I would be very gratefull for any insights, I want to add a few new
sockets in the house and plan to use these sockets and this cable (its
the same price as CAT5.
Cheers Brian |
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Brian
Guest
|
| Posted:
Tue May 24, 2005 12:20 am Post subject:
Re: Gigabit Cabling and Auto-MDIX Problems |
|
|
Brian wrote:
| Quote: | Hi, I am currently attempting to upgrade from 100BaseT, with CAT5 at
home and adding a new link with CAT7 cable, that I want to use for
Gigabit Ethernet. I Bought two Telegaertner double AMJ45 sockets. For a
first test I just cabled the two of them together straight through.
1 White/Orange
2 Orange
3 White/Green
4 Blue
5 White/Blue
6 Green
7 White Brown
8 Brown
At one end is a PC with an Intel 1000 MT Pro NIC, and the other end a
new D-Link DGS-10008D, 8 Port Gigabit switch with Auto-MDIX. SO I have a
patch cable from the switch to the first socket,then the cable run, then
a short patch cable, then the PC. The switch has 3 other PCs connected,
2 at 100BaseT and 1 with the same Intel NIC again. All connected by
short patch cables. The three PCs on the switch can communicate OK. I
get a cable fault shown by the Switch when starting for the new cable
run. I was the opinion that AUTO-MDIX would sort out any problems, at
least with any patch cables. It certainly doesn't work at all.
Here is a link to the sockets I am using.
http://www.voltus.biz/pphlogger/dlcount.php?id=voltusbiz&url=/assets/own/MA_AMJ8_8UP0_Cat6+.pdf
The datasheet with the sockets shows two ways to connect them:
B:
1 White/Orange
2 Orange
3 White/Green
4 Blue
5 White/Blue
6 Green
7 White Brown
8 Brown
and A:
1 White/Green
2 Green
3 White/Orange
4 Blue
5 White/Blue
6 Orange
7 White/Brown
8 Brown
I guess this looks like a cross over. But shouldn't the AUTO-MDIX sort
this out for me?
I would be very gratefull for any insights, I want to add a few new
sockets in the house and plan to use these sockets and this cable (its
the same price as CAT5.
Cheers Brian
Well it looks like the short patch cable to the NIC is bad. But I would |
appreciate knowing how exactly I should cable between the sockets,
straight through in every case?
Cheers Brian |
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Dmitri(Cabling-Design.com
Guest
|
| Posted:
Tue May 24, 2005 12:20 am Post subject:
Re: Gigabit Cabling and Auto-MDIX Problems |
|
|
Brian wrote:
| Quote: | Well it looks like the short patch cable to the NIC is bad. But I would
appreciate knowing how exactly I should cable between the sockets,
straight through in every case?
Cheers Brian
|
Yes, jack-to-jack connections should always be straight-through. If you
need any conversion done, such as cross-over of any kind, it has to be
done with an external cable (cord).
It will make sense if you think about it: what if you need another
cross-over, not 100Base-TX? You will need to re-wire the jacks, and more
of the time they'll be inside the wall. So, by leaving any non-standard
stuff outside the wall you'll do yourself a huge favor comes
re-configuration time.
BTW, here are couple links for your reference:
10/100-Base-T crossover:
http://www.cabling-design.com/references/pinouts/10-100base-t-crossover.shtml
Gigabit Ethernet crossover:
http://www.cabling-design.com/references/pinouts/1000base-t-crossover.shtml
--
Dmitri Abaimov, RCDD
http://www.cabling-design.com
Cabling Forum, color codes, pinouts and other useful resources for
premises cabling users and pros
http://www.cabling-design.com/homecabling
Residential Cabling Guide
-------------------------------------
##-----------------------------------------------#
Article posted with Cabling-Design.com Newsgroup Archiv
http://www.cabling-design.com/forum
no-spam read and post WWW interface to your favorite newsgroup -
comp.dcom.cabling - 2007 messages and counting
##-----------------------------------------------## |
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Brian
Guest
|
| Posted:
Tue May 24, 2005 8:20 am Post subject:
Re: Gigabit Cabling and Auto-MDIX Problems |
|
|
Dmitri(Cabling-Design.com) wrote:
| Quote: | Brian wrote:
Well it looks like the short patch cable to the NIC is bad. But I would
appreciate knowing how exactly I should cable between the sockets,
straight through in every case?
Cheers Brian
Yes, jack-to-jack connections should always be straight-through. If you
need any conversion done, such as cross-over of any kind, it has to be
done with an external cable (cord).
It will make sense if you think about it: what if you need another
cross-over, not 100Base-TX? You will need to re-wire the jacks, and more
of the time they'll be inside the wall. So, by leaving any non-standard
stuff outside the wall you'll do yourself a huge favor comes
re-configuration time.
BTW, here are couple links for your reference:
10/100-Base-T crossover:
http://www.cabling-design.com/references/pinouts/10-100base-t-crossover.shtml
Gigabit Ethernet crossover:
http://www.cabling-design.com/references/pinouts/1000base-t-crossover.shtml
Dmitri, |
OK, thanks for the reply. Yes it does make sense. Whats about the
Auto-MDIX though, shouldn't it at least sort any cross-over vs.
straight-through problems out? No doubt knowing what I am doing, and
getting it correct from the start is better than letting some automatic
feature try to sort it out for me. I assumed MDIX would at least free me
from worrying about straight-through and cross-over patch cables.
Cheers Brian |
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|
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Dmitri(Cabling-Design.com
Guest
|
| Posted:
Tue May 24, 2005 4:20 pm Post subject:
Re: Gigabit Cabling and Auto-MDIX Problems |
|
|
Brian wrote:
| Quote: |
Dmitri,
OK, thanks for the reply. Yes it does make sense. Whats about the
Auto-MDIX though, shouldn't it at least sort any cross-over vs.
straight-through problems out? No doubt knowing what I am doing, and
getting it correct from the start is better than letting some automatic
feature try to sort it out for me. I assumed MDIX would at least free
me
from worrying about straight-through and cross-over patch cables.
Cheers Brian
|
Well, it does take care of the conversion, but on the lower-end equipment
you only have it on the uplink port, NOT on every port of the switch. On
older equipment you don't have it at all, so it is better to stick with
straight jack-to-jack connections just in case.
Good luck!
--
Dmitri Abaimov, RCDD
http://www.cabling-design.com
Cabling Forum, color codes, pinouts and other useful resources for
premises cabling users and pros
http://www.cabling-design.com/homecabling
Residential Cabling Guide
-------------------------------------
##-----------------------------------------------#
Article posted with Cabling-Design.com Newsgroup Archiv
http://www.cabling-design.com/forum
no-spam read and post WWW interface to your favorite newsgroup -
comp.dcom.cabling - 2012 messages and counting
##-----------------------------------------------## |
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