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Synchronous vs asynchronous links in networks – what is the difference?

HaPe 20423 13
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What is the difference between a synchronous and an asynchronous network link?

A synchronous link means the transmitter and receiver are synchronized to the same clock, so data is sent at a constant rate and the clock can even be transmitted to the subscriber; in the link, the clock must come from only one side [#7245089][#7246996] An asynchronous link does not work with that shared timing, so the transceivers are not synchronized in the same way [#7245089] In the thread, Neostrada/ADSL is described as asynchronous, while synchronous links are said to be less common for home users and are mainly a concern for network specialists [#7249237][#7249311] One reply also notes that ATM is asynchronous and that ADSL is based on ATM, while fiber infrastructure may use SDH [#7249340]
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  • #1 7243672
    HaPe
    Level 17  
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    Hello,

    He is interested in computer networks. Sometimes I come across terms such as synchronous and asynchronous links. Someone told me it`s about bit control.
    There is little information on this subject on Google.

    Could someone please explain to me what the difference is?

    Regards
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  • #2 7243764
    11111olo
    Level 42  
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    The synchronous link is e.g. via LPT and the asynchronous link is via RS-232.
  • #3 7243823
    HaPe
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    I mean the Internet service. There are synchronous and asynchronous links.
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  • #4 7243872
    tronic1
    IT specialist  
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    Are you sure you mean asynchronous? Or maybe asymmetrical? ADSL and DSL? Type it into google and you will find the differences.
  • #5 7243878
    HaPe
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    I mean asynchronous and synchronous. People confuse this with symmetrical connections. My uncle has a small server room, probably several dozen megabytes of vDSL, and he says they have synchronous, but he doesn`t remember what it`s about from his studies.
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  • #6 7245089
    ALL-IN
    Level 10  
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    A synchronous link (in the sense of transmission technology) means that transceivers must be synchronized with each other during their operation (modulation occurs at a constant speed). It is even possible to transfer the time base signal to a specific subscriber.
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  • #7 7246368
    HaPe
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    ALL-IN wrote:
    It is even possible to transfer the time base signal to a specific subscriber.


    What does it mean?
  • #8 7246996
    trebuch1
    Level 26  
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    This means that the clock frequency that synchronizes the receiver (transceiver) clock is transmitted. This method allows you to "rigidly" maintain the data transmission channel. The bits "flitter" one after the other to the rhythm of the clock.
    Important note: the link must be configured so that the clock is transmitted only from one side.
  • #9 7248850
    HaPe
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    I see. Is the difference between a synchronous and asynchronous link noticeable?
    Neostrada is asynch or synch, does the modem synchronize with Tepsa? DSL TP(ADSL) what is it?

    I`m glad I don`t use Neostrada, I use coaxial at home and it`s fine.

    Do you know how companies like Multimedia, Toya do it with the Internet, run coaxial cables through TP manholes or rent a digital channel from TP?

    Regards
  • #10 7249237
    11111olo
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    Neostrada is an asynchronous link. I use it and I don`t feel any disadvantages ;) this type of links.
  • #11 7249258
    EBC41
    Level 28  
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    HaPe wrote:
    concentric at home and it`s fine.

    What concentric? Rg-5 H155 MRC240 or some other? If you have cable, I have to worry you, but DOCSIS, from what I know, is also asynchro. And the infrastructure of this network is based on the existing TV backbone. At the headend you have a hub (it`s called CMTS) to which the cable modems connect. Next, there is probably a Cisco router with BGP enabled and connected via light to the Internet
  • #12 7249311
    trebuch1
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    Whether to use a synchronous link or not is the concern of network specialists, not the end user for whom bandwidth and price are important.
    You can`t buy a synchronous link for a few zlotys.
  • #13 7249340
    EBC41
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    Currently, both techniques are widely used. ATM is asynchronous (it is obvious from the name) on which ADSL is based, i.e. Neostrada, Netie, DSLe and all the rest. However, for fiber optic infrastructure you use SDH, which does not prevent you from sending ATM frames afterwards
  • #14 7252134
    HaPe
    Level 17  
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    I talked to the technician and I know I have a synchronous connection.
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Topic summary

✨ Synchronous and asynchronous links refer to different methods of data transmission in computer networks. A synchronous link requires transceivers to be synchronized, allowing for a constant modulation speed and the potential transfer of a time base signal to a subscriber. In contrast, asynchronous links do not require synchronization, leading to variable data transmission rates. The discussion highlights that Neostrada is an example of an asynchronous link, while some users have synchronous connections, such as vDSL. The choice between these types of links often depends on network infrastructure and user requirements, with synchronous links typically being more expensive and used in specialized applications. Technologies like ADSL and ATM are mentioned as examples of asynchronous transmission methods, while SDH is noted for synchronous fiber optic connections.
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