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Week 27 Summary
Wed, 16 Jul 2008 13:23:46 +0000
Week 27 à “How have I managed to create >400 questions for a routing protocol I have seen described as “SIMPLE” in the past!?”
Week’s Study Time:
Study Hours = 14 inc.
Lab Hours = 0
Total study time so far:
Total Study Hours = 321 inc.
Total Lab Hours = 20.5
What I have studied during the last 2 weeks:
RIPv2
EIGRP
OSPF
Recent test scores:
Numerous ...]
Waking up ...
*whooosh!* .. then I am awakening my hibernated CCIE 'personality'
:)
The notebook that I mentioned is almost ready. Hopefully by tomorrow
I can start putting the dynamips to simulate my labs again.
Now is the warming up time: I need to pickup where I have left.
Lessons learned from the previous two attempts:
- Focus!
- Aimed and believe that you will pass
- FAce the fact, if there is still weaknes(ses) in several areas,
either patch it up or strengthen other area that I am more familiar with - Keep doing it (I read this from several post from href="http://www.groupstudy.com">Group Study
I am still one of CCIE candidate that is using poor man's method and
approach. It is also more towards stabilizing the areas and link between
the knowledge and experience of being a CCIE itself.
Out of majority of CCIE candidate, I could be one of the odds that is
not dealing directly with all CCIE needs. My work at client's requries
me to provide service beyond my CCIE-ness.
Thus, even though I have the knowlede and skills, my clients asked me
to carry out tasks in areas outside network.
The good news is: I like doing it, so no big deal ;)
the even better news is: it give me more challenge on how to separate
between the real life needs of my work and the CCIE lab that I
prepare.
I must admit that since the preparation of this CCIE track (R&S), I
have improved a lot of things in areas beyond my prediction.
Let's head back in prepration and stay tuned!
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Pro MPEG Forum CoP3 or SMPTE 2022
Pro-MPEG Forum Code of Practice #3 release 2 (CoP3) or SMPTE 2022-2007, describe how MPEG-2 Transport Streams (MPEG-2 TS) should be encapsulated when sent over IP networks. It also describes a forward error correction (FEC) mechanism that can be used to correct errors than can occur during the transport. This article will explain how video content can be sent over IP networks and how errors can be corrected using CoP3 FEC.
ASI to IP
All MPEG-2 transport streams shall be encapsulated in RTP (Real-time Transport Protocol) according to RFC 1889 in conjunction with RFC 2250. Transport service is provided jointly by UDP (checksum and multiplexing) and RTP (sequencing and time stamping / jitter removing). RTP always uses an even UDP port number.
- The overall size of RTP payload must not exceed the MTU (Maximum Transfer Unit) in order to prevent RTP packets fragmentation around the network
- Short packets induce high overhead
The time stamp field in the RTP header is based on the PCR values from MPEG-2 with a resolution of 90 Khz.
Streams must include:
- Program Association Table (PAT)
- Program Map Table (PMT)
RTCP (Real-time Transport Control Protocol) can be included to periodically inform the sending side about network quality (e.g. lost packets, delay, jitter, etc.).
At the output of the IP network, the delivered Transport Stream must be fully ISO/IEC 13818-1 compliant (40ms maximum jitter, 1 artifact every hour, etc.).
What about error protection ?
Code of Practice #3 describes a Forward Error Correction (FEC) method for protection against errors in delivering professional MPEG-2 TS data over IP networks. With that method implemented in IP video gateays, packet errors, out of order packets, network jitter and delay can be compensated.
FEC data insertion is done in real-time along with TS over IP encapsulation: Protection data is calculated and embedded in regular RTP packets with a specific payload type.
It relies on simple XOR arithmetics:
if F=A B C, then if only A,B,F are present, C can be recovered.
A FEC matrix is generated and transmitted on two separate UDP ports:
FEC columns on UDP port + 2
FEC rows on UDP port + 4
FEC Matrix is computed as follows:
FEC packets can be computed for both columns and lines. One FEC packet is able to recover one lost RTP packet in a column/row. If several packets are lost in the same column for instance, FEC packet for rows can be used to re-generate the packet.
There is new version (ver5) of the R&S workbook vol 1. IE completely changed their style in this version of the workbook. The only bad thing I am seeing is they could be more detailed in their explanations but it's only a BETA.
http://www.lively.com/html/landing.html
In less than 7 years, Mercedes-Benz plans to ditch petroleum-powered vehicles from its lineup. Focusing on electric, fuel cell, and biofuels, the company is revving up research in alternative fuel sources and efficiency.
The German car company has a few new power-trains in the line-up that European journalists have had the opportunity to test out in the Mercedes facility in Spain. One vehicle includes the F700, powered by a DiesOtto engine that combines HCCI and spark ignition to get nearly the same efficiency as diesel, but minus the expensive after-treatment systems.
The engine can run on biofuels, and we may have a purchasable vehicle by 2010 -- a year that seems to be popular for the debut of a lot of new alternative fuel car models, making ’08 and ’09 simply thumb-twiddling years for consumers. I don’t know, maybe car makers just like the roundness of “2010.” The company’s next big step will be to launch a Smart electric car which is fuel and emission-free.
Anyway, Mercedes is looking into electric vehicles, both battery-powered and fuel-cell powered. Not only are models in development, but we’ve also seen the company making steps towards its zero-petroleum goal right now, from better cabs in London to li-ion battery improvements. The company also has about 100 Smart electric cars undergoing testing in London, with that favorite 2010 year as the projected market release date.
Mercedes is making serious investments, already putting nearly $4 million into the pot of its long-term Sustainable Mobility plan, with another nearly $1.4 billion going in before 2014.
While car models may be able to run on fuels other than gasoline or diesel, we have yet to find a method of both running and producing vehicles entirely free of fossil fuels. I’m waiting for a mainstream car line that creates renewable fuel, clean-running vehicles out of 100% recycled materials in plants run on 100% renewable, clean power … Will I even be alive when that finally happens? I have hope.
Via AutoblogGreen, The Sun; Photo Leonid Mamchenkov
source: http://green.yahoo.com/blog/ecogeek/603/mercedes-to-cut-petroleum-out-of-lineup-by-2015.html
Vegetarians can be referred to as true fanatics. On the other hand, they are seriously misled in their beliefs. Practically nobody argues with them, since it is really difficult to convince a vegetarian of his or her self-deception. May be that is the reason why the vegetarian movement develops so actively around the globe and continues to recruit many new members.
The aim of this article was to spread as much information on ccie study as possible. We surely do hope that we have succeeded in it.
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