[107326] in North American Network Operators' Group
RE: 10GE CWDM
daemon@ATHENA.MIT.EDU (John Lee)
Sun Aug 31 00:04:02 2008
From: John Lee <john@internetassociatesllc.com>
To: "zzuser@yahoo.com" <zzuser@yahoo.com>, "nanog@merit.edu" <nanog@merit.edu>
Date: Sat, 30 Aug 2008 23:03:56 -0500
In-Reply-To: <922203.27764.qm@web65506.mail.ac4.yahoo.com>
Errors-To: nanog-bounces@nanog.org
Zed,
If you are looking for optical systems my fav pub is Lightwave at http://lw=
.pennnet.com/. They list DWDM and CWDM systems, lasers, optics, ROADM etc. =
If you have nanog archives go back at least six months to the thread on DWD=
M vs CWDM et al that I was one of the contributors to.
The last comment you make I do not understand since:
1. DWDM systems have many more lasers / wavelengths that are used and most =
metro and WAN providers can supply you a ITU wavelength at the normally obs=
cene prices.
2. CWDM systems are usually 4, 8, 16, 24 that are also on ITU wavelengths l=
ike DWDM systems but with 50 - 100 nm or more spacing so the lasers and opt=
ics do not have to be so precise as the DWDM optics.
Currently it is my understanding the 10 Gbps signals are carried on 4 x 2.5=
Gbps signals that are compatible with existing CWDM and DWDM equipment. Th=
ere are 40 Gbps DWDM systems and 10 Gbps lasers on 100 Gbps and greater cap=
acity systems. I agree with Alex's comments that to have 10 Gbps on a CWDM =
system is to have a CWDM system of at least 40 to 100 Gbps and that is very=
expensive today.
John (ISDN) Lee
>From Lightwafve:
Optelian adds CWDM XFP transceivers
AUGUST 19, 2008 -- Optelian (search for (search for Optelian)) has announce=
d the availability of new LightGAIN 10-Gbit/sec CWDM XFP transceivers, whic=
h the company claims create a cost breakthrough in 10-Gbit/sec capacity gro=
wth by combining the low price points of CWDM with the inventory cost benef=
its of using MSA-compliant pluggable transceivers.
"These new CWDM XFP transceivers are a cost-saving solution for fiber-const=
rained customers looking to grow their 10-Gbit/sec services [but] who don't=
need the full migration path provided by DWDM," explains Dave Dal Farra, s=
enior Optelian product manager. "And in higher growth networks, the low fir=
st cost and inventory savings can still be taken advantage of by adding up =
to 9 DWDM wavelengths into unused CWDM channels, utilizing Optelian's hybri=
d CWDM/DWDM multiplexers and 10-Gbit/sec tunable DWDM regenerators."
The new CWDM XFP transceivers are fully supported and backwards compatible =
in LightGAIN 6140, 5140, and 3060 systems, plugging into the existing RGN-1=
0GXF 10-Gbit/sec regenerator card. As part of LightGAIN, the flexibility of=
CWDM pluggable transceivers combines with Optelian's Quick-Turn Custom Pas=
sives so that custom 10-Gbit/sec CWDM configurations can be delivered as qu=
ickly as two weeks, claim company representatives.
Also useful for wavelength conversion, reach extension, and regeneration, t=
he 10-Gbit/sec CWDM XFP transceivers are now available for order. Key speci=
fications include coverage from 1471 nm to 1611 nm, plus SONET and Gigabit =
Ethernet compliance for data rates with or without G.709 FEC.
>From Alex's older e-mail:
On Fri, 25 Apr 2008, John Lee wrote:
> Subscribe to Lightwave (at no charge) and look at the back issues for net=
works. Show up at Supercom or OFC or what is replacing them and get the lat=
est on ROADM, full channel tunable lasers and maintenance costs.
>
> What size of network do you want to grow to before replacing the optical =
link equipment including ILAs?
>
> Most any org can cost justify a CWDM / CAN since you can add one fiber pa=
ir at a time and one lambda per fiber pair.
>
> DWDM gear is much more expensive and is aimed at 20 to 40 lambdas per
> fiber for service providers while UDWDM and ULHWAN are aimed at trans
> oceanic links and are very very expensive.
DWDM gear is not expensive. Passive muxes cost little. Active
transceivers cost money but not very expensive at all.
Check out these two presentations (by yours truly et al):
http://www.nanog.org/mtg-0606/pdf/lightning-talks/4-pilosov.pdf
http://www.nanog.org/mtg-0610/presenter-pdfs/pilosov.pdf
-alex
________________________________________
From: Zed Usser [zzuser@yahoo.com]
Sent: Saturday, August 30, 2008 2:54 PM
To: nanog@merit.edu
Subject: 10GE CWDM
Hi!
I seem to suffer from an acute lack of 10GE CWDM optics options. Is it just=
me or am I just looking in all the wrong places?
You'd think that by now there would be an upgrade market from 1GE to 10GE. =
DWDM wavelenghts are not always available, but CWDM often are.
- Zed
