Lighting fibre

I read recently that Carphone Warehouse have finished their rollout of
Infinera's ILS2, which uses DWDM to turn up bandwidth in increments of
100Gb/s, capable of a maximum of 8Tbs using 80 channels of 100Gbs each
when its next generation line cards are introduced (1.6 Tbs today).

In comparison, Virgin is using Nortel's 40G/100G Adaptive Optical Engine
which seemingly provides up to a maximum of 100Gb/s. Can one make a
comparison here?

Chris Hills wrote:

> I read recently that Carphone Warehouse have finished their rollout of
> Infinera's ILS2, which uses DWDM to turn up bandwidth in increments of
> 100Gb/s, capable of a maximum of 8Tbs using 80 channels of 100Gbs each
> when its next generation line cards are introduced (1.6 Tbs today).
>
> In comparison, Virgin is using Nortel's 40G/100G Adaptive Optical Engine
> which seemingly provides up to a maximum of 100Gb/s. Can one make a
> comparison here?

Sure. Both companies are shit and don't touch them with a bargepole. You can
be sure they will oversubscribe their bandwidth as per normal. It just gives
them a higher profit most likely.

Graham

On Fri, 16 Jan 2009 00:41:53 +0100, Chris Hills <(E-Mail Removed)>
wrote:

>I read recently that Carphone Warehouse have finished their rollout of
>Infinera's ILS2, which uses DWDM to turn up bandwidth in increments of
>100Gb/s, capable of a maximum of 8Tbs using 80 channels of 100Gbs each
>when its next generation line cards are introduced (1.6 Tbs today).
>
i found this link which states the next generation card will be 40G,
so 100G is a demo at a show - that is usually a long way from business
as usual deployment.
Last time i checked 4 x 10G was still comparable or better price than
1 x 40G

FWIW - 10G seems to still be the standard for practical use -
reasonable cost per lambdas, reasonable reach and you can plug in
standard routers, switches and muxes.

Even 40G is not well supported - a lot of equipment doesnt have the
interfaces yet. 100G is still demo projects and exotic technology.

>In comparison, Virgin is using Nortel's 40G/100G Adaptive Optical Engine
>which seemingly provides up to a maximum of 100Gb/s. Can one make a
>comparison here?

Nortel just went into Chapter 11 in Canada & the US, so dont bank on
them spending lots of money on R&D right now.

i think your premise that system capacity is limited by the capacity
of a line system misses the point - a good network spreads the
capacity across different routes to limit the effect of a fibre cut.

If you hit the system limit then as long as you have another fibre
pair you can build more in parallel - once a system is full you burn a
big chunk of the money in cards for all those lambdas anyway, so lower
capacity systems (which may reduce startup cost) can still be cost
effective.

and finally - you do not tend to fill a complete network evenly - you
get "hot spots" as you fill popular routes and subsections of routes
1st.

There are plenty of other high density lambda systems out there - i
really like this one:
http://xtera.com/products/NuWaveCXR.cfm

up to 240 lambdas, 10G for current use and 40G if you really want it.

Xtera use the standard lambda grid, but use a different type of wide
band amplifiers to get the aggregate capacity.
--
Regards

(E-Mail Removed) - replace xyz with ntl