Friday, March 11, 2011

Cheap difference between switch and hub



Some users have recently seen a message that the article to buy according to our networking products, businesses that have switches and hubs, switches more expensive, cheaper hubs, then the two products because they do not know what difference, it is feared by business fraud, they can not make a decision.

For this problem, we will for everyone from the technical and practical aspects on analysis of the low-end switches (in the high-end switches for large-scale professional networking) and the hub of the differences:

Start with the technical analysis:

We now use the methods of work adopted Ethernet is CSMA / CD (Carrier Sense Multiple Access / Collision Detection), the sender, it sends a data message for each, the first monitor on the network, when it detects line just free, they immediately send data, or to continue testing until the line is idle and then send. For the receiver, the received signal first to confirm, if it is issued to own the reception, otherwise ignore. Thus, the data transmission network exists to share and exchange these two concepts - shared management of the network is a non-working state to ease the disorder, each client will be possible to seize the communication channel, so a few clients the time to seize the channel with the formation of network congestion on the situation, when the data and the number of users exceeds a certain limit, they will cause the network performance of a deep recession. The switching network is to avoid the lack of shared networks, the role of the exchange of technology transfer is based on the packet destination address, independently of each packet sent to destination port from the port to avoid collision with other ports, increase the actual throughput of the network.

Shared Ethernet, the main problems is that all users share the bandwidth, the actual available bandwidth for each user with the network reduced the number of users increases. This is because when information is busy, the number of users may be linked into the "race" a channel and a channel at a time occupied only allow one user, so a lot of regular monitoring of wait state is a result, the signal transmission produce jitter, stagnation or distortion, seriously affected the performance of the network. Switched Ethernet, the switch supplies the user-specific information for each channel, unless both the source port information while trying to send to the same destination port, or each individual source port and destination port for communication between not occur simultaneously conflict.

Therefore, the hub is a shared work with the state of the equipment, since it is relatively easy to implement, so the prices are cheaper hubs, of course, deficiencies in speed will be difficult to avoid; while the switch is using switched technology, equipment, technical content higher than the hub, of course, also more expensive the price, but the switch can overcome the shortcomings of network congestion.

To sum up so to speak:

All ports on the hub of a shared channel contention bandwidth, so as to increase the number of network nodes, data traffic increases, the available bandwidth per node will be reduced. Hub in the form of transfer data by radio to all its ports to transmit data.

All ports on the switch are exclusive channel bandwidth to each port to ensure fast and efficient data transfer. Switch is to provide users with exclusive, point to point connection, the packets are only sent to the destination port, and will not send to all ports.

Hub is a shared device, itself can not identify the destination address, of that same period of a host to a web host to send data O'clock b Packets Yi hub Wei structure of the network in Guangbofangshi Chuan Shu, You each terminal by Taiwan Verify header information to determine whether the address to receive the same time the network can only transmit a data frame of the communication. This means shared bandwidth.

Switch based on mac address recognition, to complete the package forwarding data-enabled devices. Switches can learn mac address on the internal address table, the data frame through the origin and the recipient of the switching path between the interim, the data from the source address to destination address.

After reading the above, we should understand why some businesses will directly tell you "faster switches, hubs slow" (the argument is easy to understand it).

Let us go from the application of:

As the hub can not overcome a large amount of data and multi-user when the plug issue, so it can not connect too many clients at the same time we typically see in the market, many dozens of pieces of the hub are five of the ( previous 16 Internet cafe hub is also very popular, but now have been replaced by a switch), and only 10M; the switch 5 or 8 have (24 in all, but home prices are more expensive and really nothing necessary ), 10/100M speed are basically adaptive.

So after you see the article inside another switch or hub that can be used, then the best choice switch it, although a little expensive, but it is really easy to use than many of the hub.



Thursday, July 8, 2010

Perpetually PS2 iPod Deconde

Perpetually PS2 iPod Deconde is a professional video converter to convert almost all popular video/movie formats to iPhone MP4 format. The output iPod MP4 video files can be played on your Apple iPod. All popular video/movie formats are supported, including AVI, MPEG/MPG/DAT, WMV, ASF, MP4, M4V, 3GP, 3G2, H264, MPEG4, AVC, MOV, QT, DivX, XviD, VOB, FLV, etc. The amazing output quality with super fast conversion speed is brough you by the built-in power MPEG4 encoder. All the output iPod MP4 videos fit your Apple iPhone.

Thursday, March 11, 2010

AllRipper DVD Burner


AllRipper DVD Burner is an easy-to-use and effective DVD/CD burning software. With this burning program you can create Data CD, Data DVD, DVD Audio, Audio CD, MP3 CD / Audio CD Ripper and easy burn AVI, MPG, MPEG 1/2/4, WMV, MOV, MP4, RM, RMVB, DivX, Xvid, ASF, 3GP, Youtube FLV to DVD. Features: Full Drag and Drop support. Supports majority of modern IDE, USB, SCSI and FireWire CD/DVD writers. Simple, easy-to-use and highly customizable interface. Supports all CD-R / CD-RW / DVD+R / DVD+RW / DVD-R / DVD-RW / DVD-RAM discs. Supports various MP3 / OGG / WMA / WAV audio files for burning music CD directly; no temporary files are required. Supports Buffer Protection systems, like Burn Proof and others for error free recording. Quick and full erase rewritable discs. Records CD/DVD On-the-Fly; no disk space is required for temporary files. Supports long file name and Multilanguage (Joliet) file system. Just download it to have a try, you will love it.

Monday, March 1, 2010

Christmasgift RMVB to DVD


Christmasgift RMVB to DVD is the best RealMedia converter software. easy convert Real Media files(.rm, .rmvb) to AVI, MPEG-1, MPEG-2, VCD, SVCD, DVD files. convert RM/RMVB to AVI DIVX XVID MPEG VCD SVCD DVD and burn to DVD/CD. You can change the codec/system type to PAL or NTSC, and adjust the video size of the output files . It supports to convert almost all video, such as: RM to AVI, RM to DIVX XVID, RM to MPEG-1, RM to MPEG-2, RM to WMV, RM to VCD, RM to DVD, RM to PSP Video, iPod Video, Zune Video, iPhone Video...

Support convert AVI, Divx, ASF, WMV, WMA, MPEG, MOV, QT, RM, RMVB, file to MPEG with all encode format such as VCD PAL/NTSC, SVCD PAL/NTSC, DVD PAL/NTSC, MPEG-1 standard, MPEG-2 standard etc. Support convert AVI, Divx, ASF, WMV, WMA, MPEG, MOV, QT, RM, RMVB, file to AVI with all encode format such as DIVX, XVID, Mircosoft MPEG-4 etc.

Monday, February 8, 2010

Pazera Free Video to Flash Converter


Pazera Free Video to Flash Converter is an absolutely free application that converts the most popular audio & video files (AVI, MPEG, MP4, 3GP, MOV, MP3, WAV, WMA and other) into Flash Video format (FLV, SWF). Video files created by this program can be posted on video services such as YouTube, Google Video, Metacafe, Dailymotion and other. The program has a set of predefined settings (profiles) specially designed for novice users. While more advanced users can customize encoding parameters used by encoder: audio and video bitrate, fps, resolution, sampling frequency and other.

The Pazera Free Video to Flash Converter interface is a very simple and user-friendly. To convert video files, just drag & drop them into main window and click CONVERT button. If video quality is poor, increase video bitrate.

The most important features:

* Supported video formats: AVI, DivX, XviD, MPEG, MPG, WMV, ASF, MOV, QT, FLV, SWF, MP4, M4V, 3GP, 3G2, MKV, VOB, VCD DAT, OGM, AMV.
* Supported audio formats: MP3, WAV, WMA, OGG, MPC, AC3, FLAC, APE, SHN, WV, AMR, MPA, M4A, MP2.
* 2-pass encoding which will improve the video qaulity.
* Possibility to convert audio files to FLV/SWF format using the image or text as a background instead of video stream.
* Many predefined profiles. The users can create custom profiles.
* Don't need any installation. Just extract ZIP archive and click videotoflash.exe.
* Portability. This program doesn't use system registry and can be run from portable devices. All settings are written to INI file.
* Supported languages: english, polish.
* 100% freeware! - for private and commercial use. There are no limitations, watermarks, adware, spyware etc.

Pazera Free Video to Flash Converter uses free, fast and high quality video encoder - FFmpeg.



Recommand Link:



Utility software comparison



Friday, January 29, 2010

4Media Video Converter Ultimate for Mac


As expert software, 4Media Video Converter Ultimate for Mac supports converting among a large number of video formats including AVI, MPEG, WMV, DivX, MP4, RM, MOV, XviD, 3GP, FLV, especially HD video format, for fitting various multimedia devices like PSP, iPod, iPhone. And it also enables you to convert video and audio files to mainstream audio such as MP2, MP3, WMA, WAV, RA, M4A, AAC, AC3, OGG, etc. Moreover, the integrated software offers the best way to create vivid video from pictures or capture pictures in batches for enjoying with family.

Advanced features comparing Video Converter Standard/Platinum:
1. Bring you the freedom to crop video area size, adjust the brightness, saturation and contrast, or append special effects like "old film", add picture or literal watermark and so on.
2. Assist you to merge several videos into one, or clip the video to segments and output clipped segments respectively or as a merged one.
3. Offer the functions of previewing clipped video segment, the source file and comparing the source and fixed file to view the effects you want to obtain.
4. Support Xbox video, including HD video.

Basic features:
1. Lots of output ways like splitting a large file into small ones, or setting several formats from the same file for output at one time, etc., are offered for you to select according to different demands.
2. Using it, you can get desired file size for various devices by the help of the built-in Bitrate calculator.
3. Provide rich profiles sorted by common device, video, audio, picture and animation, and user defined for you to choose freely.
4. With it, setting a lot of output parameters such as video/audio quality, zoom mode, channels, bit rate, frame rate is a snap, even if you are a novice.
5. Support previewing the source file.
6. Batch process and multithreading can help to enhance the video conversion efficiency.
7. Different interface languages including English, German, Japanese, and Chinese are supported.



Recommand Link:



Free applications download site



Thursday, January 21, 2010

Daniusoft Video Converter Suite



Daniusoft Video Converter Suite is an integrated video converter software which could convert DVD and video between all popular video and audio formats such as convert AVI to MPEG, WMV to AVI, WMV to MPEG, WMV to AVI, VOB to AVI, WMA to MP3, etc in a high quality and super fast conversion speed. Daniusoft Video Converter Suite is composed of DVD Ripper and Video Converter. Just own this powerful Video Converter Suite to enjoy your DVD and Videos anywhere and anytime perfectly!

This multifunctional Video Converter Suite software provides you change custom file settings as you like, convert videos any segment, rip DVD and video by custom file size, select target subtitle and audio track and trim or crop video with only a few clicks. Just free download it to have a try!

Key features
1. Support batch convert DVDs or videos;
2. Convert DVD or video with flexible video and audio settings: adjust brightness, contrast, volume, set subtitle and check the audio track or caption of videos as you want;
3. Crop the black edges parts of video let you enjoy videos in full screen;
4. Capture any clips of DVD or video as you like and merge several chapters into one file;
5. High level customization - let you convert video with the resolution, frame rate, video bit rate and sample rate you like;
6. Capture your favorite pictures from the DVD or other video and save it to your PC;




Recommand Link:



convert flash to ps3