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dymatrixnz

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#102652 18-May-2012 22:10
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Hey guys;

I recently posted about Patch panels and HDMI cables on another forum.

I have a rather simple question. We here have Computers which plug into genesis phones which run to a server room that runs through a patch panel and into a server.

The question is I was wondering from the patch Panel to the end user device, do straight through patch panels have to be used in this instance?

Im confused about how people refer to cross over and straight through and then in the same breath refer to patch cables as if they are not straight through cables. A collegue of mine suggested that people dont ever call them straight through cables anyore and im just way behind the times.

I would have thought that if you use a crosover cable from the server to the patch and then another crosover from the patch panel to the end user device you would be crossing over twice.

Here is a pic of a RJ45 im reffering to that states Cat5 and then "Patch"

 

Also is there any point in using Cat5e Ever? Isnt it worth just using Cat6 Always for all applications being that its capable of higher throughput?

thanks guys

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kyhwana2
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  #627572 18-May-2012 22:40
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Patch cables are straight through cables yeah.

Pretty much all new gear is auto sensing, (though there may be a few things that aren't) so you can use a crossover cable and it'll autosense and figure it out.

(What are genesis phones and why are your computers plugged into them? O.o)



mjb

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  #627573 18-May-2012 22:44
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kyhwana2:
(What are genesis phones and why are your computers plugged into them? O.o)


Pretty common for VoIP phones, saves you eating up an extra ethernet outlet for your PC (and in some buildings/businesses, there's not a second one anyway)

The phone is usually just like a switch, but sometimes they're also a bit more intelligent, and the phone traffic could be on another VLAN (common in businesses).




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kyhwana2
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  #627577 18-May-2012 23:03
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mjb:
kyhwana2:
(What are genesis phones and why are your computers plugged into them? O.o)


Pretty common for VoIP phones, saves you eating up an extra ethernet outlet for your PC (and in some buildings/businesses, there's not a second one anyway)

The phone is usually just like a switch, but sometimes they're also a bit more intelligent, and the phone traffic could be on another VLAN (common in businesses).


Ahh, cool. We have 4 RJ45 sockets per person, so we have loads of patches.




Zeon
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  #627589 18-May-2012 23:25
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The patch panel will connect into a switch which the server also connects into (the switch aggregates all the network ports). As mentioned most ports are auto sensing now so cross overs are basically obsolete but they were used back in the day to connect computers directly together. Because of auto sensing this can be done with straight through cables now.

If you want to know what the difference is it has to do with the pinout of the 8 cable strands in the whole cable. Take a look at the ends of the cables, you'll notice all the colours align on straight through cables.




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dymatrixnz

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  #627605 19-May-2012 00:39
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Wow so any old Cat5e will work on most modern Auto sensing devices now? I really am behind with the times.

Does the auto sensing cause any issues with latency or anything like that? or does it literally make crossover cables obsolete.

theEd
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  #628198 21-May-2012 09:23
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dymatrixnz: Does the auto sensing cause any issues with latency or anything like that? or does it literally make crossover cables obsolete.


Crossover cables are pretty much dead. We don't even bother selling them any more.

If you're doing a new install, you'd usually use Cat6a for future-proofing against 10Gb Ethernet.

 
 
 
 

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chevrolux
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  #628312 21-May-2012 13:00
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theEd:
If you're doing a new install, you'd usually use Cat6a for future-proofing against 10Gb Ethernet.


To the desk? Why? What would a normal office computer possibly need 10Gbps for? The price of Cat6a is still ridiculous and you need shielded jacks and patch panel. For a standard office that would be major overkill and I would hate to pay the bill. We have wired a couple of homes with Cat6a but that was for a Lexcom system which sends AV and Ethernet down the same cable.

theEd
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  #628326 21-May-2012 13:20
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chevrolux: What would a normal office computer possibly need 10Gbps for?


A few years back, we were asking the same thing about 100 Mbps ethernet Tongue Out

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