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- Clean and intuitive AJAX based interface
- Integration with Microsoft Active Directory® (LDAP), vBulletin™ and ModernBill™ among many other third-party applications
- Reliable live chat seamlessly through a client's web browser
- ViewShare to share a desktop view with a client via their web browser
- Integrated VoIP (SIP) functionality
- Robust SLA management, work schedules and escalation pathways
- Teamworking features for creating and sharing events, tasks and contacts
- Detailed reports and analysis
- Synchronization with Microsoft® Outlook®
- Integrate and synchronize with a Windows Mobile® device
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.
Creating a loopback dial-peer for testing
Fri, 28 Jul 2006 06:22:59 +0000
The IPIPGW supports configuration of an RTP loopback dial peer for use in verifying and troubleshooting H.323 networks. When a call encounters an RTP loopback dial peer, the gateway automatically signals call connect and loops all voice data back to the source. In contrast to normal calls through the VoIP-to-VoIP gateway, RTP loopback calls consist ...]
multiple LLQ Low Latency Queues / bandwith (remaining) percent
Sun, 09 Nov 2008 09:26:06 +0000
LLQ means priority a queue, to forward voice and video traffic before all other traffic.
If you have multiple LLQ queues, the difference between the single and multiple queue configuration is, that if you have at least two priority queues, both get policed. So if configured in a single police-map command, you will always policed the ...]
New Design Resources 12/08
Thu, 18 Dec 2008 14:43:24 +0000
New Cisco Validated Designs and Design Resources:
I thought some readers may find one or two of the links below of use:
Implementing Nexus 7000 in the Data Center Aggregation Layer with Services
Wi-Fi Location-Based Services 4.1 Design Guide
Cisco Unified Communications SRND Based on Cisco Unified Communications Manager 7.x
Cisco Unified Contact Center Enterprise 7.5 Solution Reference Network Design ...]
Join BlogCatalog at BlogWorld
Wed, 03 Sep 2008 17:58:10 +0000
BlogWorld, the blogging world’s largest show, will be in Las Vegas on September 20th-21st. Along with blogging and social media gurus including Guy Kawasaki, Darren Rowse, and Brian Clark, thousands of bloggers, vloggers and podcasters will be there too. It’s that big.
The BlogCatalog team will be at BlogWorld and you’ll be able to find us ...]
Sorry. The page you're trying to reach does not exist on NetworkWorld.com. Please try the search box above to find what you're looking for. If you think this error page is in error, please let us know.
Issues with gatekeeper zone prefix and end point registration
Sun, 30 Jul 2006 14:43:27 +0000
If you define a zone prefix for a local zone , then it will prevent gateways from registering using E.164 ID to that zone.
zone local zone10 aaa.com 10.1.1.1
zone prefix zone10 5000
With this configuration, none of the gateways can register to zone10 using E.164 ID’s.
646-976 exam
Fri, 19 Sep 2008 06:18:51 +0000
Cisco Data Center Network Solutions Sales
Exam Number: 646-976
Associated Certifications: Data Center Networking Sales Specialist
Duration: 75 minutes (45 -55 questions) English
Available Languages: English
Click Here to Register: Pearson VUE
Exam Policies: Read current policies and requirements
Exam Tutorial: Review type of exam questions
Exam Description Exam Topics ...]
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