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Mikael,Thanks for writing your questions. >In a 4x10G module, if one laser or receiver breaks, what happens then? Will the port shut down the same way it would with a 40G >serial?
Yes, in a 4x10G module, if one laser or receiver breaks the port will be shut down the same way it would with a 40G serial. There will be no difference between the two options.
>Also, future adhoc standard for 40G serial CWDM optics (ie someone developing 40G serial CWDM-band colored optics the same >way that has happened on 1G and 10GE) speaks in favour of serial instead of 4x10G, or am I mistaken?
I believe that we should be focused on the problem at hand of finding the best solution for 40GbE on SMF. I have heard the opinion that 40G serial will give us higher capacity, which is not the case here where one 40GbE is carried on a fiber. Of course there are WDM optical transport systems that operate at 40 Gb/s today and will continue to do so in the future. However, I do not think we should be making decisions here based on the future development of colored optical transport.
Regards,Jesse
Mikael Abrahamsson wrote:
On Fri, 8 Aug 2008, Jesse Simsarian wrote:1. Operationally, 4 x 10G and 40G serial are equivalent. If anyone is voting for serial because of operational concerns, please bring this out on the reflector.I have two questions (trying to determine operational impact for me as an end-user):In a 4x10G module, if one laser or receiver breaks, what happens then? Will the port shut down the same way it would with a 40G serial?Also, future adhoc standard for 40G serial CWDM optics (ie someone developing 40G serial CWDM-band colored optics the same way that has happened on 1G and 10GE) speaks in favour of serial instead of 4x10G, or am I mistaken?
-- Jesse Simsarian Bell Laboratories, Alcatel-Lucent 791 Holmdel Rd. HOH L-277 Holmdel, NJ 07733-0400 (732)888-7040 jesses@xxxxxxxxxxxxxxxxxx