[j-nsp] Juniper's Gigabit performance

[Josef Buchsteiner]

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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