[c-nsp] Catalyst SX GBIC's and SMF - Tim Winders - net.nether.puck.cisco-nsp

11 messages in net.nether.puck.cisco-nsp[c-nsp] Catalyst SX GBIC's and SMF

From	Sent On	Attachments
Robert Walton	Jan 7, 2005 3:11 am
Mikael Abrahamsson	Jan 7, 2005 3:36 am
Justin M. Streiner	Jan 7, 2005 12:28 pm
Lindahl, Carl	Jan 7, 2005 12:36 pm
Tim Winders	Jan 7, 2005 1:54 pm
Tristan Gulyas	Jan 10, 2005 5:15 am
Church, Chuck	Jan 10, 2005 8:39 am
Niels Bakker	Jan 10, 2005 8:58 am
Bill Wichers	Jan 10, 2005 1:16 pm
Mikael Abrahamsson	Jan 10, 2005 3:51 pm
Bill Wichers	Jan 10, 2005 4:59 pm

	Permalink for this message Paste this link in email or IM:
	Permalink for this thread Paste this link in email or IM:
	Atom feed for this thread Paste this URL into your reader:

Subject:	[c-nsp] Catalyst SX GBIC's and SMF	Actions...
From:	Tim Winders (twin...@southplainscollege.edu)
Date:	Jan 7, 2005 1:54:58 pm
List:	net.nether.puck.cisco-nsp

I believe this is only with Cisco's "full size" GBICs and not with the SFP GBICS.

On Fri, 7 Jan 2005, Lindahl, Carl wrote:

Per Cisco

http://www.cisco.com/en/US/products/hw/switches/ps708/products_data_shee t09186a008014cb5e.html

You can run LX GBICs on MM Fiber w/ a specific "mode conditoning" patch cord.

-----Original Message----- From: cisc...@puck.nether.net [mailto:cisc...@puck.nether.net]On Behalf Of Justin M. Streiner Sent: Friday, January 07, 2005 12:34 PM To: cisc...@puck.nether.net Subject: Re: [c-nsp] Catalyst SX GBIC's and SMF

On Fri, 7 Jan 2005, Mikael Abrahamsson wrote:

On Fri, 7 Jan 2005, Robert Walton wrote:

I've currently got two catalyst 4000's connected via a single mode fibre using SX GBIC's in an ad-hoc network configuration - at present I've seen no service degredation and the link from box-to-box is about 40m. According to the cisco spec's these gbics should only be used with multi-mode fibre, does anyone know over what distance you would start hitting problems when using SMF with SX GBIC's?

It is not really a distance problem, it's a getting-light-into-the-hole problem. You're using a laser designed to put light into a 50 or 62.5 mikrometer diameter hole, into a 10 mikrometer hole. Basically the surface area of this hole is much less than designed. On the other hand, the light that actually gets in there will be less degraded over distance.

I would definately not recommend using SX gbics over SM fiber for production purposes. Better to purchase some LX GBICs off of ebay if your budget is tight.

Indeed. As a general rule, using SX GBICs with singlemode fiber is not recommended, nor is the reverse - LX/LH/ZX GBICs ober multimode. You can run into all kinds of problems related to modal or chromatic dispersion in those cases. This could show up as link flaps, interface errors, or some other fun problem :-) The reverse would be more dangerous because the potential exists to fry the receiver optics in your LX/LH/ZX GBICs.

jms

	Start a set with this search
	Include this search in one of my sets
	Exclude this search from one of my sets
	Permalink to these results Paste this link in email or IM:
	Atom feed for tracking future search results Paste this URL into your reader: