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    Perbedaan interleaved dan fast channel adsl

    Halo,

    gan mau tanya, apa perbedaan interleaved channel dengan fast channel pada modem adsl??

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    bedanya hanya di latency om
    interleaved channel biasanya digunakan mengurangi paket error, jadi.. paket di tahan dulu hingga beberapa, trus di gabungin jadi 1.. dikirim, tiba di tujuan di bongkar.. cacat data dapat diminimalisir
    kalo fast channel, realtime.. paket langsung dikirim tanpa di tunda. kalo paket tersebut kena EMF.. ya rusak..
    soalnya jalur dropwire biasanya rentan noise terutama yang unshield kaya kabel telpon hitam itu

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    Click here to enlarge Originally Posted by wikipedia
    Interleaving and fastpath

    ISPs (rarely, users) have the option to use interleaving of packets to counter the effects of burst noise on the telephone line. An interleaved line has a depth, usually 8 to 64, which describes how many Reed–Solomon codewords are accumulated before they are sent. As they can all be sent together, their forward error correction codes can be made more resilient. Interleaving adds latency as all the packets have to first be gathered (or replaced by empty packets) and they, of course, all take time to transmit. 8 frame interleaving adds 5 ms round-trip-time, while 64 deep interleaving adds 25 ms. Other possible depths are 16 and 32.

    "Fastpath" connections have an interleaving depth of 1, that is one packet is sent at a time. This has a low latency, usually around 10 ms (interleaving adds to it, this is not greater than interleaved) but it is extremely prone to errors, as any burst of noise can take out the entire packet and so require it all to be retransmitted. Such a burst on a large interleaved packet only blanks part of the packet, it can be recovered from error correction information in the rest of the packet. A "fastpath" connection will result in extremely high latency on a poor line, as each packet will take many retries.
    seperti itulah kedengarannya

 

 

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