DSL Speeds

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Fusion Speeds

Sonic.net Fusion service has no arbitrary speed caps; we deliver the fastest connection the copper infrastructure will support at your location. The primary limitation on download speed is loop length.

ADSL sync rate Net ADSL speed* Maximum transfer speed FTP Transfer of 10 meg testfile**
1000 kbps 870 kbps 108.7 KBytes/sec ~92 seconds
2000 kbps 1740 kbps 217.5 KBytes/sec ~46 seconds
5000 kbps 3450kbps 543.7 KBytes/sec ~18 seconds
15000 kbps 13050 kbps 1631.2 KBytes/sec ~6 seconds
30000 kbps 26100 kbps 3262.5 KBytes/sec ~3 seconds

Please note that 1,000kbps is the upload speed for the vast majority of single-line Fusion circuits. Sync rates significantly above 20,000kbps are only possible with two-line bonded Fusion service.

DSL Speeds

Non-Fusion DSL is a tiered service with speed caps depending on service level.

Expected Download Speeds

Listed below are download speeds used for Sonic.net DSL service offerings. For example, an Express DSL circuit's download speed should fall between the performance listed for 384kbps and that listed for 1.5mbps.

DSL sync cap

Net speed*

Maximum transfer speed

FTP Transfer of 10 meg testfile**

192 kbps 163 kbps 20.3 KBytes/sec ~512 seconds
384 kbps 327 kbps 40.8 KBytes/sec ~256 seconds
768 kbps 655 kbps 81.8 KBytes/sec ~128 seconds
1.5 mbps 1.3 mbps 162 KBytes/sec ~64 seconds
3.0 mbps 2.6 mbps 325 KBytes/sec ~32 seconds
6.0 mbps 5.2 mbps 650 KBytes/sec ~16 seconds

Expected Upload Speeds

Listed below are upload speeds used for Sonic.net DSL service offerings. For example, an Express DSL circuit's upload speed should fall between the performance listed for 128kbps and that listed for 384kbps.

DSL sync cap

Net Speed*

Maximum net transfer speed

FTP transfer of 10 meg testfile**

128 kbps 111 kbps 13 KBytes/sec ~735 seconds
256 kbps 222 kbps 27 KBytes/sec ~367 seconds
384 kbps 334 kbps 41 KBytes/sec ~245 seconds
416 kbps 354 kbps 44 KBytes/sec ~230 seconds
608 kbps 528 kbps 66 KBytes/sec ~155 seconds
768 kbps 655 kbps 81.8 KBytes/sec ~128 seconds

* Protocol overhead for ATM, LLC, TCP/IP, and other factors contribute at least 13% overhead, dependent upon MTU settings and other factors. Some software packages use different means to compensate for this overhead, so readings within 10% of the listed value should be considered normal. For a technical look at ATM-related overhead, please see ip-atm.overhead.pdf. Acrobat Reader is required to view this document.

** Full URL is ftp://ftp.sonic.net/pub/testfile.compressed.10meg

Testing Your Speeds

There are a number of speed-testing programs available on the web, many of them through web interfaces, such as:

These can give you a quick idea of the speed of your connection, but are not necessarily accurate, as a number of network issues can impact performance on these tests that have nothing to do with your actual connection. For these reasons, we recommend testing your speed the old-fashioned way: by downloading a file of a known size, and seeing how long it takes to get it. Please note that if you have any other activity on your DSL line, this will affect your speeds. Further documentation for the FTP client included with your OS is available for Windows XP and OS X Tiger.

Download Test

Using a FTP program, connect to the host ftp.sonic.net. Open the directory named "/pub". Locate the file named "testfile.compressed.10meg" and download it. In most FTP programs, your rate of transfer is displayed during the download. Note that some will display speeds in kilobytes per second, and other will display in kilobits per second. Kilobytes are typically represented by the abbreviation "KB" in uppercase, and kilobits are typically represented by "kb" in lowercase. Not all programs follow this convention, so please consult your software's documentation if you are unsure. When the file transfer has completed, compare the amount of time it took to perform the complete transfer to the [down download speeds] chart above.

Upload Test

Once you have the testfile.compressed.10meg on your hard drive, you can test your upload speeds by placing a copy of it into your Sonic.net home directory. Using your FTP program, connect to ftp.sonic.net using your Sonic.net login name and password for authentication. You should automatically be directed to your home directory, unless you have specifically configured your FTP otherwise. Locate your copy of the testfile.compressed.10meg file on your computer and use your FTP program's "put" command to initiate and upload. As with the download, most FTP clients will give an indication of the current transfer rate while the upload is in progress. When the file transfer has completed, compare the amount of time it took to perform the complete transfer to the [up upload speeds] chart above. If you find that your transfer speeds are below the expected minimum speeds for your service type, please confirm by trying the transfer again, then contact technical support for assistance.