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  • #2189746

    Wireless & Wired Speeds

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    by jshep ·

    I hope I do not sound like a complete idiot.

    Comcast offers speeds of up to 6Mbps (6 mega bits per second).

    802.11g transmits to over short distances up to 54Mbps.

    How come my comcast connection seems much faster than my 802.11g connection?

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    • #3059678

      Many variables not defined…

      by gralfus ·

      In reply to Wireless & Wired Speeds

      Are you talking about transferring files from one computer to another via wireless, or using wireless to connect to the internet versus using a wired connection, or something else?

      If the download time from the internet (wirelessly) is truly faster than transferring from one computer to another computer on the same subnet, then there is a problem. You’d have to narrow it down systematically.

      It could be the TCP/IP stack on either computer, the NIC on either computer, any firewall software you have installed, the access point between the two computers, and more. As you can see, there are many factors that could be influencing the speed.

      • #3059657

        Internet Connection

        by jshep ·

        In reply to Many variables not defined…

        I am talking about using the wireless to connect to the internet versus a wired cable modem connection from comcast.

        Nothing is wrong. I am just trying to make sense of the speeds. Wireless is listed at up to 54Mbps and my broadband is 6Mbps, yet the broadband is faster.

        Thanks

        • #3059589

          Wait…back up

          by jmgarvin ·

          In reply to Internet Connection

          Are you saying you have a wireless ISP? You can connect to this wireless ISP via something?

          You need to define more. How do you connect to the wireless ISP? Are you sure it is 802.11g? If it is 802.11b, then you will only get 10mbps.

          So here is the question. Your setup with comcast is:
          Cable drop -> Cable modem -> ethernet out of cable modem -> NIC in PC

          Your wireless setup is:
          wireless ISP -> wireless reciever/Wireless NIC???

        • #3056631

          Reply To: Wireless & Wired Speeds

          by jshep ·

          In reply to Wait…back up

          No wireless ISP. I use a wireless network at work and we have a T-1 connection.

          I am positive it is a 802.11g and I get about 45 to 50Mbps.

          Yes comcast is cable drop -> cable modem -> ethernet to ethernet PC NIC

          Wireless – T1 -> Linksys router 802.11g -> Belkin Pre-N wireless PCMCIA NIC

        • #3056570

          If I get this right..

          by jdmercha ·

          In reply to Reply To: Wireless & Wired Speeds

          You’re comparing your Comcast speed at home to your T1 speed at work?

          Cable is much faster than T1.

        • #3059081

          Are you kidding????

          by bruno fonseca ·

          In reply to If I get this right..

          You’re actually saying that cable is faster than a T1. Maybe you can be right on the fact that when the connection reaches your desk, compared to the connection that reaches your desk when using cable it can be faster, but that depends on the employee size of the company that uses bandwith and other factors, but cable is defenitly not faster than a T1, Absolutely not. You have a T1 trunk and a cable line run to your house and then you will notice a difference.

        • #3059380

          Well…….

          by carlitosway ·

          In reply to Are you kidding????

          Cable companies claim they provide bandwidth service between the averages of 10MB and 2MB. (Depending upon your location, company, and how many people have cable in your vicinity.)

          T1’s that are under business level accounts are supposed to have a guaranteed bandwitdh at 1.5MB for a wide range of user’s at one time. Cable speeds start to deteriote when you are using 5 users or more. There’s no guaranteed bandwith on home cable lines. Thats why they have that 2-10MB range.

          So technically, cable has a faster thoroughfare rate than a T1, but a T1 can provide the same
          level of bandwidth for more users at that guaranteed 1.5MB speed.

          By the way, the other speeds for Trunk lines are T2 and t3, 6.3MB and 44.7MB, respectively.

          Hope this helps.

          Carlitosway

        • #3062549

          Some cable companies have upgraded.

          by tonythetiger ·

          In reply to Are you kidding????

          and are offering speeds of 5 mbps or even higher.

        • #3062497

          Raw speed

          by jdmercha ·

          In reply to Are you kidding????

          There are many factors that will affect the speed you get. But cable has a faster raw speed than T1. To check what you get go to http://reviews.cnet.com/Bandwidth_meter/7004-7254_7-0.html. The result may not mean much, but compare home to work and see what you get for a difference.

        • #3059280

          OH!!

          by jmgarvin ·

          In reply to Reply To: Wireless & Wired Speeds

          Ok I think I understand now.

          The problem is this. As (more or less) a single user on your cable system you are getting about 3mb (up to 6mb I believe).

          With the T1 you get 1.5mb and you have multiple users at the business. Plus you are sharing the 54mb connection the wireless provides.

          Does that help?

        • #3054544

          Yes!!

          by jshep ·

          In reply to OH!!

          Yes this helps. I appreciate everyone’s response. I didn’t realize the overhead associated with wireless.

          Also, I just wanted to make sure I wasn’t whacked into thinking that 6Mbps is faster than 54Mbps.

          I dislike how cable companies market “6 megs” download speeds. I also associate “megs” with mega bytes not mega bits.

          Thank you all!!

        • #3056835

          Wireless

          by choppit ·

          In reply to Internet Connection

          A sizeable chunk of your quoted 54Mbps (some say up to 80%) is likely being lost to encryption overheads. Also, it may be the case that your kit is actually operating at less than 54Mbps due to poor signal/interference.

    • #3062553

      Reply To: Wireless & Wired Speeds

      by tonythetiger ·

      In reply to Wireless & Wired Speeds

      The 54Mbps is the speed of the link between your computer and the wireless access point. Your T-1 connection between there and the internet is only about 1.5 mbps.

    • #3062775

      you have to be scientific !

      by hozcanhan ·

      In reply to Wireless & Wired Speeds

      seems to is a very decieving situation in wireless networking . use iperf.exe to measure your net speeds. then you can compare accurately . make sure your network traffic is the same at the time of measurements.

    • #3062648

      Answer to your question.

      by hebbeson ·

      In reply to Wireless & Wired Speeds

      Here is an answer to your question about throughput.

      With a wired connection, it is almost a given that you are transmitting data in full-dulex mode, meaning that you are sending and receiving data at the same time. Almost all wired networks do that nowadays (with the exception of some antiquated networks, still running in half-duplex mode; these are very rare nowadays).
      Add to that the transmit speed, generally 100mbps or 1000mbps, and you can see how large amounts of data seem to go faster on a wired network.

      With that being said, here is the outlined breakdown of a wireless connection:

      1. Most access points (APs) run in Half-Duplex Mode. This means that the AP can only send or receive data at any given time; it cannot do both at the same time like a full-duplex connection can.
      2. A data-rate rating of 54mbps is misleading at best. This is an ‘aggregate’ data rate, meaning that since the radio is only half-duplex, it is up to 27mb send/receive at any given time.

      A side note #2 – this full throughput is assuming that you have an unobstructive (line-of-sight) connection to the AP itself. As you have obstructions (things in the way of the direct signal to the AP), you will get a reduction in throughput since the radio has to re-transmit packets. This lowers the throughput and overall speed. Another kink in the wheel is that it also depends on which frequency you are ‘talking’ on. A 2.4GHz frequency signal is less susceptable to obstructions than a 5GHz frequency signal is. Both 802.11a and 802.11g have an aggregate throughput of up to 54mbps.
      Yet another kink in the wheel is latency (the speed of the radio itself to process and transmit the data). Since most of the APs are Half-Duplex, they take longer to send/receive data. If they are in a ‘send’ cycle, your data will have to wait if you are sending it to the AP that is in ‘send’ mode. This creates latency. Additionally, if you are farther away from the AP or there are obstructions, then your latency will be greater even still.

      There are many variables in all of this. In theory, it is fairly simple, and following basic wireless principles in design and implementation will yield a productive wireless network.

      I hope this helps.

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