The only GBIC that doesn't care whether or not you use MM or SM is the LX/LH
GBIC. There are two other types that might benifit your situation. The SX
GBIC is cheaper and is only compatabile w/ MM. I have seen instances where
I've caught link off of SM but only from a 3 meter patch cord. The distance
limitation of SX GBIC's is relevant to what micron core you have and the
modal frequencies of the fiber. The range of 62.5 micron and 160 MHz/km
frequency is 722 ft (220 m) and 50.0 micron and 500 MHz/km freq is 1804 ft
(550 m). Also there is the ZX model which is the nicest, it uses SM and can
shoot up to 62.1 miles (100 km). Depending on the size of the building I
would recommend using the SX cards. In most cases everything across the
board is cheaper, and (although I'm unsure of your situation) there doesn't
seem to be the need for the greater distance features of the other cards.
Hope this helps.
Steve Jarvis
-Original Message-
From: Chuck's Long Road [mailto:[EMAIL PROTECTED]]
Sent: Thursday, August 15, 2002 8:26 AM
To: [EMAIL PROTECTED]
Subject: Re: Cabling techniques between 4006 2550 [7:51411]
2950 switches?
all Cisco GBIC's ( and in fact all GBIC's in general ) are SC connectors.
there are such thing as SC-ST patch cables, in case your contractor
terminates the fiber as ST.
Multimode fiber has a distance limitation of 1800 feet or so. You can use LX
GBIC's in conjunction with mode conditioning patch cables at both ends over
multimode fiber, and extend that distance quite a bit.
Or you can go with single mode. I am not certain, but I think I read
someplace that single mode fiber on short runs requires an attenuation patch
cable at both ends
The GBIC's don't care much what kind of fiber you use, but you do need to be
aware of the gotcha's
I don't have the Cisco link hand, but a search on GBIC and distance
should get you to a couple of good guides on CCO.
HTH
--
coming soon:
www.chuckslongroad.info
John Brandis wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
Hi All,
Am building a new network and have some questions to answer, before I get
cabling quotes. I have placed an order for a Cat 4006 at my core, and some
20 2550 switch's at my distribution layer. Running a pretty simple
network.
MY question is:
1). To run between the 3 floors in my building, what type of fibre would
be
best used
2). What type of termination points of the fibre,, are required, so i can
cnonnect to the 4006 and 2550 respectively.
Thanks all for your answers last night about the VPN. I got it going after
some pre-shared key spelling mistakes, and a bug in the VPN concentrator
software was found.
John
Sydney, Australia
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