[c-nsp] Catalyst SX GBIC's and SMF

[Church, Chuck]

For what it's worth, here is info on distances for both GBICs and SFPs:
SFP -
http://www.cisco.com/en/US/products/hw/modules/ps5000/products_data_shee
t09186a008014cb62.html
GBIC -
http://www.cisco.com/en/US/products/hw/modules/ps872/products_data_sheet
09186a008014cb5e.html

Table One in both cases.  LX will provide much longer distance on MM if
you're stuck using 62.5 micron cable, maybe that's what they were
referring to. 


Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Netco Government Services - Design & Implementation Team
1210 N. Parker Rd.
Greenville, SC 29609
Home office: 864-335-9473
Cell: 703-819-3495
cchurch at netcogov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D 


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Tristan Gulyas
Sent: Monday, January 10, 2005 5:16 AM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Catalyst SX GBIC's and SMF

All,

I have seen an installation where mode conditioning cables are used to
go 
between LX SFP modules with MM fibre.  I have no idea about the reverse
(SX 
GBICs with SM fibre) although I don't see why this wouldn't be possible.

I have been told that running 1000baseLX with MM fibre + mode
conditioning 
patch cables gives you "slightly better" range than using native SX, but

there's no solid evidence for this, so I'd stick to the 550 metre spec
as 
per 1000baseSX to be safe.

With respect to the original problem,  it depends on how the fibre runs 
between the cat4000s (whether it's just "across the floor" or whether 
there's cable running through a building)  It may be substantially
cheaper 
to aquire a MM fibre patch cable vs. purchasing LX GBIC/SFP modules.

.t 

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