Deutsche Telekom Trials 100G

Deutsche Telekom AG (NYSE: DT) is the latest Tier 1 operator to check out the potential of 100-Gbit/s transmission, having completed a successful field trial in Germany using optical gear supplied by Ericsson AB (Nasdaq: ERIC).

The trial is part of an ongoing three-year, €66 million ($85.6 million, 32-gallon) project called 100-GET (100-Gbit/s Carrier-Grade Ethernet Transport Technologies) that's being coordinated by Celtic Telecommunications Solutions.

The main goal of the project is "to develop carrier-grade transport networks based on a data transmission rate of 100 billion bits per second over Ethernet at high quality." More than 30 companies and organizations are involved in 100-GET, including ADVA Optical Networking , Alcatel-Lucent (NYSE: ALU), Deutsche Telekom, Ericsson, and Nokia Networks . (See The Road to 100GigE.)

And there's no doubt that the world's leading carriers want to find the quickest and most cost-effective way to enable 100-Gbit/s capabilities in their networks. (See Verizon's Wellbrock: 100G Is Needed, The Road to 100G Winds Up Carriers, and Optical's Great Leap Forward.)

The Deutsche Telekom trial, which took place in December, achieved greater than 100-Gbit/s transmission using its existing fiber and already commercially deployed technology, in this case the Marconi MHL 3000 WDM platform. (In case anyone has forgotten, and you should have, Ericsson snapped up Marconi more than three years ago -- see Ericsson Buys Bulk of Marconi.)

DT deployed the Marconi gear in July 2008 for 40-Gbit/s transmission. Now Ericsson says it's meeting initial customer demand for greater optical capacity and "advancing its 100G roadmap... by upgrading deployed Marconi MHL 3000 systems."

The trial involved "an existing link with mixed 10G and 40G traffic with a 50 GHz channel spacing was used." The result? "A line rate of 112 Gbit/s was achieved using polarization multiplexed RZ-DQPSK [Return-to-Zero Differential Quadrature Phase-Shift Keying] and a fast polarization tracker over 600-kilometer standard SMF [singlemode fiber]. The link included multiple ROADMs and unequally distributed amplifiers. With links optimized for distance, more than 1,200-kilometer optical path length is possible," stated Ericsson. (See Next-Gen ROADMs and 40- & 100-Gbit/s Technology & Components for an in-depth look at some of these technologies.)

The vendor, which has been pushing its optical credentials much harder recently following the launch of its packet-optical transport system (P-OTS) platform last November, notes that further field trials are planned with DT during 2009, and that it will "further cooperate closely with customers to determine the best modulation formats to ensure that the products fit future requirements." (See Ericsson Makes Packet-Optical Play.)

Other existing Marconi MHL 3000 customers include Cable and Wireless plc (NYSE: CWP), Taiwan's Chunghwa Telecom Co. Ltd. (NYSE: CHT), Telecom Egypt , Telecom Italia (TIM) , Telefónica SA (NYSE: TEF), Telstra Corp. Ltd. (ASX: TLS; NZK: TLS), and Italy's Wind Telecomunicazioni SpA , according to Ericsson.

DT joins the likes of AT&T Inc. (NYSE: T), Verizon Communications Inc. (NYSE: VZ), Comcast Corp. (Nasdaq: CMCSA, CMCSK), XO Communications Inc. , and a number of research and educational establishments in checking out 100 Gbit/s capabilities. (See Internet2, ESnet Want Their 100-Gig, Verizon Adds Nortel to Its 100G Club, Verizon Goes Long(er) With 100-Gig, 100-Gig Demo, Verizon Keeps 100-Gig Promise, Comcast Thinks Big, NEC, AT&T Demo 100G, and Comcast, Nortel Put 100G to the Test .)

And, of course, Ericsson is far from alone in chasing 100-Gbit/s glory -- Alcatel-Lucent (NYSE: ALU), Ciena Corp. (NYSE: CIEN), Huawei Technologies Co. Ltd. , Infinera Corp. (Nasdaq: INFN), NEC Corp. (Tokyo: 6701), Nokia Networks , and Nortel Networks Ltd. are all focused on taking transport networks to the next level. (See Nortel Shows Single-Slice 100GE, Ciena Pushes 100-Gig, AlcaLu Gets Tropical in the Metro, VZ, Nokia Siemens Tout 100-Gig Trial, Huawei Touts 100G WDM, and Infinera Demos 100GigE.)

And 100 Gbit/s –- and especially the developments underway in the test and measurement community –- are expected to figure prominently at the upcoming OFC/NFOEC event in San Diego later this month. (See OFC Goes to 100, Nortel Taps Ixia for 100GE, and EXFO Acquires PicoSolve.)

— Ray Le Maistre, International News Editor, Light Reading

Stevery 12/5/2012 | 4:09:26 PM
re: Deutsche Telekom Trials 100G

The trial is part of an ongoing three-year, Gé¼32 million ($41 million, 32-gallon) project called

32 gallons?-á of what, beer?


Kudos to the team.-á Maybe it's the science fair, but this stuff ain't easy.

DCITDave 12/5/2012 | 4:09:25 PM
re: Deutsche Telekom Trials 100G budget cuts took away my currency calculator. so all i had was my Martha Stewart cooking measure cheat sheet. it'll have to do.
digits 12/5/2012 | 4:09:25 PM
re: Deutsche Telekom Trials 100G

Even I didn't know we were converting our euros and dollars into gallons now.... and I wrote this article!!

I can't wait to see how many-áChinese Renminbi I can get to the gallon! :-)

If we have to choose, I go for Chilean Malbec..... a few gallons of that would last a week, maybe.


boozon 12/5/2012 | 4:09:24 PM
re: Deutsche Telekom Trials 100G

I'm not too sure about the Euro to the gallon current rate but the 100GET funding is 66MEuros not 32MEuros.


How many pubs can you dry out with such a sum?


digits 12/5/2012 | 4:09:23 PM
re: Deutsche Telekom Trials 100G


I like your way of thinking.... if we were in Denmark, the answer would be about 3 - man, that is one expensive place to buy a beer. And I mean, one beer. I maxed my credit card buying a round. It was scarey.

-áBut back to the budget - yeah, I see that figure. I also see the Gé¼32 million-áI referenced at


"100GET has a duration of three years until 2010 and a total funding of about 32 million euro."

I have a message in with the Celtic folk to see if they

a) drank Gé¼34 million of the budget in one evening in a Copenhagen beer cellar, or...

b) got additional funding to take the total to Gé¼66 million, or...





pavlovsdog 12/5/2012 | 4:09:17 PM
re: Deutsche Telekom Trials 100G

Its not clear from the press release if real data was transported or not.-á 100G wavelength experiments have been around since ~2006, and this maybe more of the same.-á

The question is whether they managed to build electronics for carrying real data, which would-áinclude some level of multiplexing, framing, fec encoding, etc...

What source of-ádata did they use?




digits 12/5/2012 | 4:09:15 PM
re: Deutsche Telekom Trials 100G

OK, here's the deal...

The Gé¼32 million I has in the original article is the amount of public funding the 100-GET project is receiving.

The overall budget is Gé¼66 million, so I have updated the article to show the overall budget. -á-á

Thank you again to Boozon for pointing out that discrepancy.


digits 12/5/2012 | 4:09:01 PM
re: Deutsche Telekom Trials 100G

Here is the lowdown from Ericsson on what they actually using the-á100G trial connection:

"In this kind of trial we use pattern generators, i.e. we start with PRBS sequences and multiplex them to higher data rates (which results into another PRBS if you manage the delays in the right way). This is the quite common approach which includes-áthe investigation of all relevant effects.

If we-áhad focused more on the illustrative rather than the technology level we could have used-álive data streams (e.g. a video sequence or live video)-áand for that-áwould-áhave implemented-áa precoder-á(i.e. in an FPGA) at the transmit side.

However this-áapproach would not have given the-áfurther information about the quality of the transmission (PRBS gives you a more reliable measurement) that was-árequired. In the end-áa transponder must support OTU-4 with an enhanced FEC. This framing and FEC at 100G is not yet available. In the trial we 'assume' a FEC threshold at a pre-FEC error rate of 2e-3, that means having a lower rate-áwhich would result in zero errors post-FEC. This approach is also common in R&D. An alternative would be to implement a client FEC on the same FPGA as the precoding (But today's FPGAs-ádon't have the capacity to implement a-áFEC for the whole 100G signal)."

Hope that helps.


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