[j-nsp] Juniper's Gigabit performance
Josef Buchsteiner
josefb at juniper.net
Wed Dec 24 09:10:45 EST 2003
Wednesday, December 24, 2003, 2:42:33 PM, you wrote:
> On Wed, Dec 24, 2003 at 01:15:09PM +0100, Josef Buchsteiner wrote:
>> the PIC-FPC Slot Bandwidth for FPC Type 1 is 1Gbit/sec.
> Hm ok, I had otherwise in mind. Perhaps I did the mistake to divide
> the 3.2Gbps FPC bandwidth by 4 (which would result in 800Mbps per
> PIC).
> Is your 1Gbps figure net, or gross (including J-Cell overhead)?
There is no J-Cell going from the PIC towards the FPC so this
is net. The packet stream will be cut into Cell at the I/O
Manager towards Memory and this is where you have the memory
bandwidth of 3.2Gbps excluding J-Cell overhead for one I/O ASIC
and the reason why you will not be able to run line rate on
4 * 1port GE-PIC on one FPC which is also documented AFAIK.
thanks
Josef
> Regards,
> Daniel
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