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All FAQs » SWBell DSL FAQ » 3. Cap Issues

FAQ RevisionsEditors: Flippant See Profile, kmac1 See Profile
Last modified on 2007-10-18 13:27:41
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3. Cap Issues

·What ports and services does SBC block?
·What is a cap?
·Why have I been capped?

What ports and services does SBC block? (#5247)
In the last few years SBC has implemented port 25 (SMTP) blocks in various regions of the country to try to combat Spam email. For example - SBC/Ameritech (»Ameritech - SBC FAQ »Does ameritech block any ports? (Update 08/16/2005)) - and this may extend to other areas over time.

If you feel you are being blocked you should first check your own firewalls or routers. You can then try the Telnet test found here: »Ameritech - SBC FAQ »The Telnet Test for SMTP Server Connectivity

If you find Port 25 is blocked by SBC you can follow the instructions in this document: »Ameritech - SBC FAQ »Here's what to do if port 25 is blocked for you

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by Flippant See Profile edited by Riss_Centaur See Profile
last modified: 2005-08-09 15:18:34

What is a cap? (#1019)
A cap is a bandwidth (speed) limit placed on the download portion of the DSL service. The upload rate is fixed to either 128kb (CO based installs), 160kb (RT installs), 250kb (Deluxe Service) or 384kb (Expert Service) and are never capped.

Download caps are as follows: 192, 384, 768, 1536 and 6000. Technically they are 192-384, 384-1536, 384-768, 384, 192 interleaved, 384 interleaved, 1536-6044

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by Flippant See Profile
last modified: 2003-07-22 10:57:31

Why have I been capped? (#1020)
Your line quality or line distance indicates that you will have problems maintaining service sync. A reduction in bandwidth often makes an unusable service reliable. Without the cap your DSL connection may repeatedly be disconnected.

However, some lines are inadvertently capped and can support full service speed. In order to determine if your line will support either a higher cap or having the cap lifted call ASI. See the phone list.

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by Flippant See Profile


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