> Re: [LINK] The PLAN, and broadband speeds?

[Adrian Chadd]

On Fri, Jun 22, 2007, steve jenkin wrote:

> Related comment - what's the cost difference between FO transceivers for
> 100Mbps and 1,000Mbps ethernet??
> Same fibre for 100M, 1G and 10G.  10Gbps transceivers are a lot more
> expensive.
> Older technologies basically cost the same [and sometimes oldest is more
> expensive]

I think you'll find the cost of actual physical infrastructure to switch
lots of 100mbit vs lots of gigabit - especially if you want 0% oversubscribed
ports in key places - is pretty hefty.

Its not just about the transceivers. Its (comparitively) easy to light up
metro fibre, its difficult to light up longer fibre runs (eg, need
repeaters?), but once thats done you still have to switch the bits.

You can buy expensive SDH kit to build a nice, large network which breaks
off timeslices into manageable port sizes which are then fed into your
MPLS/IP layer and you can run multiple SDH loops over WDM. Thats never
been the issue. It costs to buy the kit, it costs to push all those
IP bits out to end customers without performance degredation.

Having fibre in the ground is a great achievement but then you have to
actually switch bits over it.




Adrian