DWDM interconnects

David Diaz techlist at smoton.net
Tue Jan 7 00:24:06 UTC 2003


Actually I forgot to mention.  Since we have different frequencies 
for the lasers, you and your peer would have to agree ahead of time 
and stock that particular frequency or "color."  IT's a major 
stocking nightmare especially for spares.  The real explosion may 
occur as tunable lasers drop in price that can allow 8 or more 
different frequencies.

If anyone has any info on seeing price drops over the last year 
please share the information.

Dave

At 19:11 -0500 1/6/03, Barton F Bruce wrote:
>DWDM comes in many flavors, and I doubt it makes much sense to hand another
>carrier a fiber with a lot of different lambdas on it (if that is what you
>were asking). There are way too many variables.
>
>OTOH, if you were simply refering to buying the use of one "wave" (or
>"lambda") that is a normal product for many companys. Unlike dark fiber,
>they have lit the route and are just selling you a lambda off their big DWDM
>system. They may choose to price it differently if you are running OC192 on
>it than if you are running OC48, bit in any case the Sonet ADM gear is up to
>you.
>
>Your connection is very apt to be a short range 1310 into them and their
>DWDM gear then will convert it to an ITU grid color up in the 1550 range and
>will coordinate signal levels, etc to eliminate crosstalk with adjacent
>channels. All you can mess up is your traffic.
>
>Lambda sales will become even more popular at major optical switching
>centers as realtime open markets evolve.
>
>Finisar is finally about to ship GBIC shaped pluggable optical devices in
>ITU grid colors. They will have actually, I think, two speed ranges, one for
>OC3 and OC12 and the other one for GIG-E and OC48. The exact application
>depends on the card you plug this generic device into. First big batch
>samples this month, and full production maybe April.
>
>The SFP (Small Formfactor Pluggable) units won't be getting ITU grid colors
>for over a year later.
>
>Finisar has been armtwisted into protecting the largest router arrogance,
>especially in the 80km GBIC product space. In the more plebian range down at
>the 10 km 1310 units or the local MultiMode units you will find more price
>competition and should pay respectively less than $200 and $100 even in
>small quantities. Molex doesn't make 80km units but does make the rest, and
>cisco as well as everyone else buys from both. Don't ever say whose
>equipment you are go to use a GBIC with, because they then may not sell it
>to you! The DOJ has to fit in here somewhere.
>
>On a metro area scale, I bet someone might sell you a lambda on a passive
>DWDM network  to some building where your service didn't compete with
>theirs, and where you were using the same power same brand pluggable "GBIC"
>like devices and where there was no chance for your messing up their
>adjacent channels with too hot a signal. These pluggable devices will open
>up many options.
>
>But the long haul intelligent DWDM systems are juggling way too many
>variables and should be under one company's management. There is too much at
>risk and too easy to screw up.
>
>Of course two carriers can and will do whatever they want between
>themselves. We were the first carrier to drag an RBOC into an
>interoperability test with our cisco/cerent 15454s and their whatever. Cisco
>had not been certified til then to interconnect to any RBOC and was very
>eager. VZ, well, they did it because the letter from their legal dept said
>to. They used the Fugitsu FLMs in various sizes to test against just one
>Cerent using its wide range of cards. Now VZ is using Cerents themselves.
>
>After the grief we went through to get simple RBOC OC3, OC12, and OC48
>interconnections blessed, I would hate to try adding DWDM to the mix.
>
>----- Original Message -----
>From: "Pete Kruckenberg" <pete at kruckenberg.com>
>To: <nanog at merit.edu>
>Sent: Monday, January 06, 2003 6:04 PM
>Subject: DWDM interconnects
>
>
>
>>
>>  How common are DWDM interconnects between networks
>>  (carriers)?
>>
>>  Is DWDM considered a reliable/scalable/operable carrier
>>  interconnection technology?
>>
>>  Is multi-vendor DWDM (whether internal to the network or for
>>  carrier interconnection) practical or sensible, especially
>>  for carrier/network interconnection? Many vendors proclaim
>>  interoperability, but does that work in the real world?
>>
>>  Pete.
>>





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