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  1. #1
    Super Modz crazed 2.0's Avatar
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    What is Bandwidth

    There are three frequently used definitions of bandwidth in the context of Information Technology (IT) and general business.

    1) In computer networks, bandwidth is used as a synonym for data transfer rate, the amount of data that can be carried from one point to another in a given time period (usually a second). Network bandwidth is usually expressed in bits per second (bps); modern networks typically have speeds measured in the millions of bits per second (megabits per second, or Mbps) or billions of bits per second (gigabits per second, or Gbps).

    Note that bandwidth is not the only factor that affects network performance thou.
    There is also packet loss, latency and jitter, all of which degrade network throughput and make a link perform like one with lower bandwidth. A network path usually consists of a succession of links, each with its own bandwidth, so the end-to-end bandwidth is limited to the bandwidth of the lowest speed link (the bottleneck).

    Different applications require different bandwidths. An instant messaging conversation might take less than 1,000 bits per second (bps); a voice over IP (VoIP) conversation requires 56 kilobits per second (Kbps) to sound smooth and clear. Standard definition video (480p) works at 1 megabit per second (Mbps).
    But HD video (720p) wants around 4 Mbps
    HDX (1080p) more than 7 Mbps.

    Effective bandwidth -- the highest reliable transmission rate a path can provide -- is measured with a bandwidth test. This rate can be determined by repeatedly measuring the time required for a specific file to leave its point of origin and successfully download at its destination.

    2) Bandwidth is the range of frequencies -- the difference between the highest-frequency signal component and the lowest-frequency signal component -- an electronic signal uses on a given transmission medium. Like the frequency of a signal, bandwidth is measured in hertz (cycles per second). This is the original meaning of bandwidth, although it is now used primarily in discussions about cellular networks and the spectrum of frequencies that operators license from various governments for use in mobile services.

    3)
    In business, bandwidth is sometimes used as a synonym for capacity or ability. In this sense, bandwidth usually refers to having time or staffing available to tackle something, e.g. "We just don't have the bandwidth to take on mobile app development, we're already short-staffed on developers."

    C/P
    Margaret Rouse @ TechTarget

    __________________________________________________ __________________________________________________ __________________________________________

    An estimated internet consumption (BANDWIDH) per month based on using your IPTV service @ 8 hours per day.
    Live TV Channels:
    SD = 750Kbps = 329.58 MB / Hour @ 8 Hours per Day = 81.73 GB / Month
    HD = 1 Mbps = 439.43 MB / Hour @ 8 Hours per Day = 108.98 GB / Month
    VoD Movies:
    MicroHD = 650Kbps = 285.63 MB / Hour @ 8 Hours per Day = 70.83 GB / Month
    HD = 1.4 Mbps = 615.21 MB / Hour @ 8 Hours per Day = 152.57 GB / Month

    C/P
    Last edited by crazed 2.0; 07-10-2015 at 02:06 AM.

  2. #2
    Member TVFan's Avatar
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    Hey Crazed, I just found this very interesting thread on bandwidth and I have a couple of questions.

    When I look at the actual bandwidth usage of streaming video on Kodi (by pressing the letter "o" while viewing live TV) I get numbers very close to your's:

    - good quality SD (720 x 480) = 0.85 - 0.89 Mb/s (Starz East)

    - full HD (1920 x 1080) = 1.74 - 2.14 Mb/s (Sports 3)

    But I'm confused about the conversion to monthly usage. Isn't the math Mb/s x 30 = Mb/minute and Mb/minute x 60 = Mb/hour?

    So 1 MB/s = 1x60x60 = 3600 Mb/hour = 3.6 Gb/hour @ 8 hours /day would be 3.6 x 8 x 30 = 864 Gig monthly usage?

    What am I missing here?
    TVFan in the West

    Kodi 17.1 RC with PVR Simple Client on PC using Win 10, and
    Kodi 17.1 RC with Stalker Client on PC using Xubuntu 16.04

  3. #3
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    Bandwidth is how much 'space' you have available for data transfer. Imagine a straw, or a hose. You only have a certain amount of space before it gets full and starts slowing down the flow. You can only suck so much through a straw at once.

 

 

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