From: paul cosgrove (paul.cosgrove@gmail.com)
Date: Tue Feb 10 2009 - 14:10:08 ARST
If you wish to be compliant with 802.3 then a transmitting device should not
use an interframe gap smaller than the time it takes to send 96 bits.
However there are cases where you may wish to do so. Intel used to use this
on some of their EtherExpress NICs to allow for faster throughput (see
http://en.wikipedia.org/wiki/Interframe_gap) and it is also used for RFC2889
compliance testing when deliberately overloading devices:-*
5.6 Forward Pressure and Maximum Forwarding Rate
*....
*5.6.3.2 Minimum Interframe Gap*.....
Test frames *SHOULD* be transmitted to the first port (port 1) of the
DUT/SUT with an interframe gap of 88 bits. This will apply forward pressure
to the DUT/SUT and overload it at a rate of one byte per frame. The test
frames *MUST* be constructed with a source address of port 1 and a
destination address of port 2.
The FR on the second port (port 2) of the DUT/SUT is measured. The measured
Forwarding Rate should not exceed the medium's maximum theoretical
utilization (MOL).
A reduced interframe gap would not make any difference to passive DWDM
equipment, it just sees a wavelength and passes it through.
Paul.
On Tue, Feb 10, 2009 at 1:45 PM, James MacDonald <j4m3sm63@yahoo.ca> wrote:
> I think maybe the app was calculating other test data as well either by
> config error or bug. Maybe send and recieve were combined somehow ... If you
> have a physical GigE port then you can only ever get 1Gbps bi-directional.
>
>
> James MacDonald
> E: jamesm@nevolutions.ca
> P: 416-580-6873
>
> The world is evolving ... is your network?
> Email info@nevolutions.ca to see how we can transform your network!
>
> On 9-Feb-09, at 10:47 AM, <subodh.rawat@wipro.com> wrote:
>
> Hi folks,
>
>
>
> Can you please let me know if a 1Gbps DWDM link can send data at more
> speed than 1Gbps?
>
>
>
> Thanks
>
> Subodh
>
>
>
>
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