Difference between GBIC and Giga Ethernet interface

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Hi all,

I will connect 2 switchs catalyst (2950 or 2960) by STP by Giga interface.

For this need, generally, i use GBIC interface and its work fine.

Today, a lot of catalysts are provided with Giga Ethernet interface (RJ45)
like catalyst 2960.

If i use this port (Giga Ethernet interface) to connect the two switchs,
what will be the differences ?

So, i juste need to understand what differences btw Gbic and Giga Ethernet
interface and what is the best choice ?

Thank You very much !!!

Best Regards
Rahan



Re: Difference between GBIC and Giga Ethernet interface
Rahan wrote:
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I'm not an expert but I think GBIC enables you to cover a greater distance. If
your link length is less than that
specified for Gigabit Ethernet you can use Gigabit Ethernet.
We're using GBIC to connect 2 switches  located in 2 different buildings. Maybe
we could do the same with Ethernet.
If your switches are quite close each other you don't need to move to GBIC.

Alex.

Re: Difference between GBIC and Giga Ethernet interface

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Ethernet
distance. If your link length is less than that
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Maybe we could do the same with Ethernet.
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GBIC.

Thanks a lot Alex.

Can someone confirm that distance is the alone difference ?

In technology fibre (Gbic or Mini-Gbic), two cables (fibres) are used. I
think that one is used to transmit and the second for receive data. If it's
true, using Gbic or Mini-Gbic (SFP) can increase bandthwith performance.

i am not sure. i don't know.

Any confirmation ?

Thanks a lot

Best Regards
Rahan



Re: Difference between GBIC and Giga Ethernet interface

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With a "1000BASE-ZX" you'll get up to 70km ...

http://www.cisco.com/en/US/products/hw/modules/ps5455/products_data_sheet0900aecd8033f885.html

as opposed to 100m with the "1000BASE-T SFP" ...

http://www.cisco.com/application/pdf/en/us/guest/products/ps5455/c1650/cdccont_0900aecd8040bd01.pdf

Other relevent data sheets ...

http://www.cisco.com/en/US/products/hw/modules/ps5455/products_data_sheets_list.html

BernieM




Re: Difference between GBIC and Giga Ethernet interface

AM wrote:
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1000BaseTX is 1000BaseTX whether on GBIC or not.

However - be aware than not all ports are created equal however I think
that
on your particular platforms that there will be no difference.

On a 4500 for example the Supervisor engine ports each
have a dedicated 1Gbps to the Switch fabric and many
line card ports do not.

Even copper ports nowaday run really clean.
Here is the first one that I looked at:-

  Hardware is Gigabit Ethernet Port,
     8415914730 packets input, 4343581946310 bytes, 0 no buffer
      1389 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored


The input erriors are due to congestion since this port
contends for the backplane.


Re: Difference between GBIC and Giga Ethernet interface
Thanks a lot for yours answers.

So, the connector of SFP port is RJ45 ???!!!

Can you confirm please ?

Rahan



Re: Difference between GBIC and Giga Ethernet interface

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No, SFP is not RJ45. SFP stands for "Small Form Factor". In that SFP port
you could put a fiber or RJ45 gbic in it.



Re: Difference between GBIC and Giga Ethernet interface

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so, when you said "you could put a RJ45", you mean converter Fiber to RJ45 ?
and when you use directly module Fiber, it's a native solution ?

Thanks a lot
Rahan



Re: Difference between GBIC and Giga Ethernet interface

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You can get SPF with 1000baseTx (!) hence , yes is might be a RJ45



Re: Difference between GBIC and Giga Ethernet interface

Martin Bilgrav wrote:
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Rahan,

When you buy a switch with an SPF /slot/ it is exactly like buying a
switch with a GBIC /slot/.

You cannot connect anything to it /except/ an SPF module
or a GBIC module. These are extra cost items.

In turn the GBIC or SPF allows you to connect a variety
of different physical cable types.

For example -
   RJ45 terminated Cat6 cable
   Appropriately terminated Multi-mode fiber
   Appropriately terminated Single mode fiber

The SPF slot is about the same size as an RJ45 socket
and in a low resolution web image looks a lot like an RJ45
socket but it is not.

The SPF system is like the GBIC system except that the
modules are smaller.

I hope that answers your question. Finally:-))


Re: Difference between GBIC and Giga Ethernet interface


Martin Bilgrav wrote:
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port
RJ45











Thanks You anybody43 for your answer. It's verry full answer !! :)
Thanks a lot !!

Best Regards
Rahan



Re: Difference between GBIC and Giga Ethernet interface
Hi Rahan,

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SFP is "Small Formfactor Pluggable" GBIC that works very similar to a
full size GBIC, except its much smaller.  When you see SFP, just think
GBIC (but in a physically smaller size). Just like a full size GBIC
you plug in the appropriate SFP module (the actual GBIC) that you wish
to use, either Copper or Fibre, etc.

Cheers..................pk.

--
Peter from Auckland.

Re: Difference between GBIC and Giga Ethernet interface

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Hi

yes - many has 10/100/1000 RJ45 ports.

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That you use another port.

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A port is a port - doesnt matter what interfaces it has.
GBIC (older tech) come in many flavors. like fiber, stacking, longrange
fibers, and RJ45-1000baseT
SPF (Newer Tech) comes in not somany flavors, fiber, longrange fiber and
RJ45-10/100/1000 (!)
GBIC and SPF are both names/terms for the connecting interfaces. The port
"in the other end" is just a regular port, like if it were a 10/100/1000.

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HTH
Martin




Re: Difference between GBIC and Giga Ethernet interface

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(RJ45)
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Ethernet

Thanks a lot Martin !!!

Best Regards
Rahan



Re: Difference between GBIC and Giga Ethernet interface
To add to this discussion there are four types of gigabit ethernet:

1000baseSX - short wavelength optical max distance about 500m
1000baseLX - long wavelength optical max distance about 500m
Both optical methods can use multimode fiber optics, but only LX can use
single mode. Single mode has a farther max distance, but I am not sure of
the maximum.

1000baseCX - shielded twisted pair copper
1000baseTX - unshielded twisted pair copper. cat5e or cat6 cable required.

enjoy.

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Re: Difference between GBIC and Giga Ethernet interface

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Cisco have plenty of documentation about SFPs and GBICs that will answer
Rahan's questions and correct a couple of glaring misconceptions in the
above.  Try starting at
<http://www.cisco.com/en/US/products/ps6577/index.html>.

Sam

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