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To: Maurice Winn who wrote (73313)	5/1/2010 4:35:45 PM
From: carranza2	1 Recommendation Read Replies (3) \| Respond to of 74559

Here are the characteristics of 652: Nondispersion-Shifted Fiber (ITU-T G.652) The ITU-T G.652 fiber is also known as standard SMF and is the most commonly deployed fiber. This fiber has a simple step-index structure and is optimized for operation in the 1310-nm band. It has a zero-dispersion wavelength at 1310 nm and can also operate in the 1550-nm band, but it is not optimized for this region. The typical chromatic dispersion at 1550 nm is high at 17 ps/nm-km. Dispersion compensation must be employed for high-bit-rate applications. The attenuation parameter for G.652 fiber is typically 0.2 dB/km at 1550 nm, and the PMD parameter is less than 0.1 ps/ km. An example of this type of fiber is Corning SMF-28. As opposed to 655: Nonzero Dispersion Shifted Fiber (ITU-T G.655) Using nonzero dispersion-shifted fiber (NZDSF) can mitigate nonlinear characteristics. NZDSF fiber overcomes these effects by moving the zero-dispersion wavelength outside the 1550-nm operating window. The practical effect of this is to have a small but finite amount of chromatic dispersion at 1550 nm, which minimizes nonlinear effects, such as FWM, SPM, and XPM, which are seen in the dense wavelength-division multiplexed (DWDM) systems without the need for costly dispersion compensation. There are two fiber families called nonzero dispersion (NZD+ and NZD–), in which the zero-dispersion value falls before and after the 1550-nm wavelength, respectively. The typical chromatic dispersion for G.655 fiber at 1550 nm is 4.5 ps/nm-km. The attenuation parameter for G.655 fiber is typically 0.2 dB/km at 1550 nm, and the PMD parameter is less than 0.1 ps/ km. The Corning LEAF fiber is an example of an enhanced G.655 fiber with a 32 percent larger effective area. Figure 3-14 illustrates the dispersion slope of NZDSF with respect to SMF and DSF. Elmat is a mechanic, for the most part. He cannot tell the difference between those two and a string with tin cans at each end. Not that I can either, but 652 seems serviceable enough.

To: Maurice Winn who wrote (73313)	5/1/2010 4:55:52 PM
From: elmatador	Respond to of 74559

I've left and open precedent to reply to MQ.

To: Maurice Winn who wrote (73313)	5/1/2010 4:57:22 PM
From: elmatador	Read Replies (2) \| Respond to of 74559

This is an authentic mail I replied to our planning dept here: O meu! Imprensa Africana reportando sobre empresa estatal e tu engole? Um dia o chines fez vala rasa. No dia seguinte UGANDA is laying the wrong fibre optic cable for the national backbone infrastructure, local and international experts have said. newvision.co.ug Amanhã vai aparecer em Uganda aqueles ratões que a Angola Telecom diz comeu o cabo dela Relax. 1. Just marketing campaign of vendors vying for contracts 2. Operators leasing lines to incumbent see the prospects of business disappearing try destroying reputation of new OF routes Nothing to worry about. 27 years ago I used to do this for Siemens. (In Nigeria) I defended microwave and destroyed the reputation of Ericsson’s O.F. routes. Ericsson build fiber for Oil company. Since they offered to lease extra capacity for NITEL, we could lose the digitalization of microwave. I reported that the Nigerian farmers were cutting the cable looking for water. Unsafe. Siemens paid newspaper to publish. Then reported to Ministry of Communication (with photo report and all since my report was authentic). NITEL stayed with Siemens microwave. I can teach people (and give them certificates) on how to play dirty tricks Osvaldo

To: Maurice Winn who wrote (73313)	5/1/2010 5:00:17 PM
From: elmatador	Respond to of 74559

translation of the email: What? African press reporting on state owned enterpripse and you swallow? One day the Chinese made shallow trench (this will follow in the next posting). Next day is laying the wrong fibre optic cable for the national backbone infrastructure, local and international experts have said. newvision.co.ug Tomorrow will show up in Uganda those big rats Agola Telecom says are eating their cable here (more on that next) Relax. 1. Just marketing campaign of vendors vying for contracts 2. Operators leasing lines to incumbent see the prospects of business disappearing try destroying reputation of new OF routes Nothing to worry about. 27 years ago I used to do this for Siemens. (In Nigeria) I defended microwave and destroyed the reputation of Ericsson’s O.F. routes. Ericsson build fiber for Oil company. Since they offered to lease extra capacity for NITEL, we could lose the digitalization of microwave. I reported that the Nigerian farmers were cutting the cable looking for water. Unsafe. Siemens paid newspaper to publish. Then reported to Ministry of Communication (with photo report and all since my report was authentic). NITEL stayed with Siemens microwave. I can teach people (and give them certificates) on how to play dirty tricks Osvaldo

To: Maurice Winn who wrote (73313)	5/1/2010 5:02:38 PM
From: elmatador	Respond to of 74559

The email saying the Huawei shallow trench From: xxxxx Sent: quarta-feira, 21 de Abril de 2010 11:20 To: xxxxxx Cc: xxxxxx Subject: Huawei now ordered to fix fibre-optic errors in Uganda. Importance: High Translation: Good monring dear directors. You must read this: theeastafrican.co.ke Regards, xxxxxxxx Transmission Planning Dept.

To: Maurice Winn who wrote (73313)	5/1/2010 5:06:18 PM
From: elmatador	Respond to of 74559

The big rats that ate the optical fiber. Some subcontractyor bungled 200Km of fiber by laying wrongly. In order those save their asses they said rodents ate the fiber. The sings were to big. The rodent should have been the size of a donkey. Someone got the photos of some big rodents (perhaps a capibara :-) and showed. This can do real damage to optical fiber. Next they showed: This is the more expensive fiber you should deploy. But here they get Elmat: he can filter wayo and see through the issues clearly.

To: Maurice Winn who wrote (73313)	10/29/2010 10:20:38 AM
From: elmatador	Read Replies (1) \| Respond to of 74559

I look to fiber types now because of two issues I am dealing now: One backhaul moving from traditional TDM to IP Two Long haul networks moving to use the optical domain for switching. Leaving aside One. I am good to teach lay people on the stuff I do. Your long haul has stopovers. On the stopovers, you must dismantle the whole load to take just a small parcel out. Akin to landing a B747 just to take a shoe box out at this ariport. What if you pass over the city drop the shoebox by parachute and B747 kept flying with the heavy load? This is light domain add and drop. ROADM for short. What has this to do with the fiber type? I explain: The fiber was not optimally utilized. You used the best spot along the spectrum to transmit light (which carried the data). Now we want several colors of the light spectrum carrying its own data load. That is DWDM. Here is the problem. There are some colors that are more affected by fiber quality parameters than others. Thus one must use a fiber that is finely tuned for the new tasks of carrying difertent colors carrying different loads of data. That means I take that fiber and at a point where I need to branch to the left, I just filter that specific color and sent it to the left, The other colors continue ahead. Thus we did not have to go electrical to remove data out of the fiber total load. This is just appearing and is for heavy use not for Africa where we are not doing ROADM. Clever sales guys are saying: one must install now the fiber for ROADM. If you look closely, Africa, the whole continent has the total data capacity of Austria. Say in 25 years it has a capcity requirement that warrants ROADM. Well 25 years is the life of a fiber, by the way. And in 25 years those guys would be implement a total different network architecture and with different paradigms. Therefore just dump the G652 and make things happen now.