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Smokeshow
Premium
join:2009-02-26
Cold Lake, AB
reply to cablegeek01

Re: Cisco CRS with 100Gb line card

Correct me if I am wrong, but those look like SC connectors on that fiber... Does that thing really only require 2 fibers to push 100G? I was under the impression that 100G used a total of 20 fibers for 10x 10G channels and typically used 2 ribbons of fiber with MTP connectors.

I've never seen anything of this magnitude though. Fastest I've worked with is 10G.


cramer
Premium
join:2007-04-10
Raleigh, NC
kudos:8

DWDM, baby! Cisco 100GBASE CFP Modules Data Sheet


sk1939
Premium
join:2010-10-23
Mclean, VA
kudos:10
Reviews:
·T-Mobile US
·Verizon FiOS
reply to Smokeshow

said by Smokeshow:

Correct me if I am wrong, but those look like SC connectors on that fiber... Does that thing really only require 2 fibers to push 100G? I was under the impression that 100G used a total of 20 fibers for 10x 10G channels and typically used 2 ribbons of fiber with MTP connectors.

Back when 100G came out that was true, but it hasn't been the case with the advent of WDM and DWDM technology (pioneered I believe, with 40G ethernet).

cramer
Premium
join:2007-04-10
Raleigh, NC
kudos:8

That's still true for "SR" (multimode fiber), but who's going to do 100G on MM???

(It's more likely to use the SR optic to make a single 100G interface 10x10G interfaces.)



TomS_
Git-r-done
Premium,MVM
join:2002-07-19
London, UK
kudos:5

1 edit
reply to Smokeshow

said by Smokeshow:

I was under the impression that 100G used a total of 20 fibers for 10x 10G channels

There are a few ways to provide 100G, one as you say being 10x10G channels, either physical (using a ribbon fibre) or logical using multiple wavelengths over a single pair. Another is 4x25G in similar configurations.

It is also possible to 100G as a single channel, and Ive been involved in the deployment of some long haul transmission kit that is single wavelength 100G. On a DWDM line system with 80 channels, were talking 8tbit/sec. Thats some seriously sexy stuff.

cramer
Premium
join:2007-04-10
Raleigh, NC
kudos:8

I wasn't aware of anyone doing single lambda 100G. Who's the vendor/manufacturer for those optics?



TomS_
Git-r-done
Premium,MVM
join:2002-07-19
London, UK
kudos:5

Alcatel-Lucent.

They arent "optics" as such, more trans/muxponders.


sk1939
Premium
join:2010-10-23
Mclean, VA
kudos:10
Reviews:
·T-Mobile US
·Verizon FiOS

said by TomS_:

Alcatel-Lucent.

They arent "optics" as such, more trans/muxponders.

I've seen some of the equipment (carrier hotels), never been able to lay hands on it though (not my specialty/repsonsibility). Are the mux's still on the large side, or have they managed to shrink it a bit?


TomS_
Git-r-done
Premium,MVM
join:2002-07-19
London, UK
kudos:5

The ones Ive wroked with are the PSS-32 chassis, which is 19" wide an 13 or so RU (can just fit 3 of them in a rack). Ive worked more with muxponders than their transponders, and you can fit 5 of them in that chassis, so 50 x 10g = 500g line side per chassis x 3 = 1.5t per rack. Since the chassis is only about 300mm deep you can probably fit them front and back too.

Not sure if theres anything else more dense than that.


sk1939
Premium
join:2010-10-23
Mclean, VA
kudos:10

The one's I saw were 1/2 rack, so they've either shrunk somewhat, or have a lower capacity. Still, the amount of speed you have at the carrier level is amazing, I wonder what the link utilization is.