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 Post subject: Re: Cabling Standards
PostPosted: Wed Jan 02, 2013 7:32 pm 
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javin wrote:
Steven King wrote:
that1guy15 wrote:
No im talking about the transceiver. Think about how pissed everyone would be after spending all that money on X2 optics just a few years back and now not having any line cards to use them in after upgrading their current chassis.

Its just a guess but Im thinking this is why cisco keep the X2 on some cards. Who knows, it is strange though...



Ah ok - I'm on the same page as you now.

On a separate note... I swear everyday I run into something that just makes me feel dumb.

So, is there a difference between a fiber run between two switches, and a "fiber patch cable"? Like, what is used to connect, say, two buildings?

I'm curious because I see this:
Belkin 5 Meter 10 gig LC/LC Multimode Duplex Fiber Optic Cable 50/125

And this:
Patch cable - LC/PC multi-mode (M) - LC/PC multi-mode (M) - 66 ft - fiber optic - 50 / 125 micron - aqua


Only thing I can think of is the patch cables may not have to adhear to building fire codes but anything ran in walls does.

Side note: Looking at your Spreadsheet, why is LC the only connector listed for 1000SX and LX?


Regarding the side note, like I said before it's a work in progress - I added stuff to it as I saw it. It's far from complete.

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 Post subject: Re: Cabling Standards
PostPosted: Thu Jan 03, 2013 8:06 am 
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Steven King wrote:

So, is there a difference between a fiber run between two switches, and a "fiber patch cable"? Like, what is used to connect, say, two buildings?



a fiber patch cable is typically already crossed over, the fiber runs, or extensions are straight through.

learned this when we did a data center upgrade a few years ago, rehomed a bunch of IDF closets into the data center, a bunch of fiber extensions were ordered, thus nothing worked when we connected it. had to have the company come back and swap all the fiber pairs on one side to make them cross over, tx/rx

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 Post subject: Re: Cabling Standards
PostPosted: Thu Jan 03, 2013 5:09 pm 
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Ahhhhh interesting! Thanks!

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 Post subject: Re: Cabling Standards
PostPosted: Thu Jan 03, 2013 7:36 pm 
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ristau5741 wrote:
learned this when we did a data center upgrade a few years ago, rehomed a bunch of IDF closets into the data center, a bunch of fiber extensions were ordered, thus nothing worked when we connected it. had to have the company come back and swap all the fiber pairs on one side to make them cross over, tx/rx


If you are unlucky or have no budget/resources, you get to cross those pairs yourself on your patch cables. I have ran into a few patchbays where there was no logical pairing of tx/rx at all.


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 Post subject: Re: Cabling Standards
PostPosted: Fri Jan 04, 2013 2:50 pm 
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How does one go about crossing them yourself? I'm not sure I fully understand - anyone aware of any good docs/websites off the top of their heads that explain this in addition for the need of fiber patch cables?

My old Network+ book doesn't go over this... after reviewing it, looks like it's time for that one to go in the trash or to a young buck who's just starting.

EDIT - My "Network Administrators Survival Guide" and "Campus Network Design Fundamentals" books don't go over it either. :(

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 Post subject: Re: Cabling Standards
PostPosted: Fri Jan 04, 2013 3:12 pm 
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With LC usually the Tx and Rx are independent from each other and you just swap the ports they plug into. With SC and some LC connectors they are usually fixed together in which case Im not sure unless you connect 1 meter jumper to cross them. Its pretty common for the Tx/Rx to get plugged in incorrectly so if you dont get a link this is usually the first thing I try.

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 Post subject: Re: Cabling Standards
PostPosted: Fri Jan 04, 2013 3:17 pm 
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You can always dismantle the connector on the patch cable, be it LC or SC, and swap them.

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 Post subject: Re: Cabling Standards
PostPosted: Fri Jan 04, 2013 3:20 pm 
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srg wrote:
You can always dismantle the connector on the patch cable, be it LC or SC, and swap them.


yeah they just snap apart, harder to get back together, I've broken so many...

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 Post subject: Re: Cabling Standards
PostPosted: Fri Jan 04, 2013 3:29 pm 
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that1guy - I usually end up with LC that are connected I guess it is all about what was orderd.

But most (all?) the duplex couplers can be dismantled, but like ristau said, not always put back together...

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 Post subject: Re: Cabling Standards
PostPosted: Fri Jan 04, 2013 6:01 pm 
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javin wrote:
.... but like ristau said, not always put back together...


Bahhhhhh that's what duct tape is for. :P

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 Post subject: Re: Cabling Standards
PostPosted: Fri Jan 04, 2013 6:09 pm 
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javin wrote:
that1guy - I usually end up with LC that are connected I guess it is all about what was orderd.

But most (all?) the duplex couplers can be dismantled, but like ristau said, not always put back together...


Yeah the last few orders of LCs were that way but the majority of what I have purchased or worked with in the past have been separate. Ill have to pay attention to that in my next order. Im also LOVING that SFPs now have the direction arrows printed on them!! Never noticed this until my last few orders.

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 Post subject: Re: Cabling Standards
PostPosted: Mon Jan 07, 2013 1:38 am 
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that1guy15 wrote:
javin wrote:
that1guy - I usually end up with LC that are connected I guess it is all about what was orderd.

But most (all?) the duplex couplers can be dismantled, but like ristau said, not always put back together...


Yeah the last few orders of LCs were that way but the majority of what I have purchased or worked with in the past have been separate. Ill have to pay attention to that in my next order. Im also LOVING that SFPs now have the direction arrows printed on them!! Never noticed this until my last few orders.


Arrows!? how... logical! That is awesome.

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 Post subject: Re: Cabling Standards
PostPosted: Mon Jan 07, 2013 1:41 am 
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They've been there like forever :)

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 Post subject: Re: Cabling Standards
PostPosted: Mon Jan 07, 2013 9:19 am 
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srg wrote:
They've been there like forever :)

Your gonna make me go dig through some of my old SFPs! Unless I have just never looked I dont remember them being there in the past. Maybe non-cisco SFPs are this way as Ive always worked with Cisco SFPs.

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 Post subject: Re: Cabling Standards
PostPosted: Mon Jan 07, 2013 9:33 am 
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that1guy15 wrote:
srg wrote:
They've been there like forever :)

Your gonna make me go dig through some of my old SFPs! Unless I have just never looked I dont remember them being there in the past. Maybe non-cisco SFPs are this way as Ive always worked with Cisco SFPs.

:D. Some vendors make them reeaally discrete though.

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 Post subject: Re: Cabling Standards
PostPosted: Mon Jan 07, 2013 9:46 am 
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Alright, I checked my old SFPs. All Cisco and of various types. Its about 50/50 with or without markings. Those with markings are either stamped into the SFP, painted on the SFP or printed on the sticker. No consistency either.

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 Post subject: Re: Cabling Standards
PostPosted: Mon Jan 07, 2013 10:26 am 
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Heh... its like cabling, physical terminators, and transceivers are the bastard children of networking...

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