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Differences
This shows you the differences between two versions of the page.
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adsl:troubleshoot [2010/11/26 11:07] mats |
adsl:troubleshoot [2010/11/26 14:00] (current) mats |
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| If the modem has been in contact with a DSLAM (two or three dots) but could not maintain a connection, or could not transmit data on the connection, then you need to check: | If the modem has been in contact with a DSLAM (two or three dots) but could not maintain a connection, or could not transmit data on the connection, then you need to check: | ||
| - VCI/VPI values on the [[:web GUI:Network page#Access type|Network page]] must match your Internet Provider's values. | - VCI/VPI values on the [[:web GUI:Network page#Access type|Network page]] must match your Internet Provider's values. | ||
| - | - ADSL mode on the [[:web GUI:ADSL page]] must match the ones used be the DSLAM at the other end of the connection | + | - ADSL mode on the [[:web GUI:ADSL page]] must match the ones offered by the DSLAM at the other end of the connection |
| - | - ADSL standard on the Advanced [[:web GUI:ADSL page]] must match the ones used be the DSLAM at the other end of the connection | + | - ADSL standard on the Advanced [[:web GUI:ADSL page]] must match the one used by the DSLAM at the other end of the connection |
| ===== Training, retraining and disconnecting ===== | ===== Training, retraining and disconnecting ===== | ||
| Line 40: | Line 40: | ||
| If this never seems to happen, see the [[troubleshooting:internet_access_problems|internet access problems]] page for how to carry on the troubleshooting. | If this never seems to happen, see the [[troubleshooting:internet_access_problems|internet access problems]] page for how to carry on the troubleshooting. | ||
| It may be a problem with the VPI/VCI settings or some DHCP or PPPoE/PPPoA problems. | It may be a problem with the VPI/VCI settings or some DHCP or PPPoE/PPPoA problems. | ||
| - | + | \\ | |
| - | The ADSL connection, when successfully established, will stay up "forever", as long as the modem is powered on. | + | \\ |
| - | However, disturbances can happen on the telephone line that may force the modem to drop the link. | + | \\ |
| + | The ADSL connection, when successfully established, will stay up "forever" as long as the modem is powered on. | ||
| + | However, disturbances can happen on the telephone line that may force the modem to drop the link and to retune to the apparently noisy line. | ||
| In the ADSL language this is a //retrain//. | In the ADSL language this is a //retrain//. | ||
| This is visible on the display: the ''**Hi**'', ''**Lo**'' or ''**AC**'' text disappears and is replaced by one or more dots (see above).\\ | This is visible on the display: the ''**Hi**'', ''**Lo**'' or ''**AC**'' text disappears and is replaced by one or more dots (see above).\\ | ||
| - | In the [[web_gui:system_log_page|system log]] there is a message | + | In the [[web_gui:system_log_page|system log]] there is now a message |
| line(line): Link down. | line(line): Link down. | ||
| accompanied by one or more lines telling, in technical terms, the causes of the link drop. For example: | accompanied by one or more lines telling, in technical terms, the causes of the link drop. For example: | ||
| Line 52: | Line 54: | ||
| It is not always clear what causes such a disturbance. | It is not always clear what causes such a disturbance. | ||
| - | Surprisingly often, the cause is to find within the customer's premises (i.e. inside the building): | + | Surprisingly often, the fault is actually to be found at the customer's premises (i.e. inside your own building): |
| - | * Is the ADSL connector and the [[adsl:start#Splitter|splitter]] properly connected?\\:!: Generally, the ADSL modem should be connected to the 1:st (main) phone jack to get as clean signal as possible. | + | * Is the ADSL connector and the [[adsl:start#Splitter|splitter]] properly connected?\\ :!: Generally, the ADSL modem should be connected to the 1:st (main) phone jack to get as clean signal as possible. |
| - | * Are there more devices, apart from phones, attached to this telephone line, such as fax machines? If so, try disconnecting them one at a time to see if the problem disappears. | + | * Are there more devices, apart from phones, attached to this telephone line, such as fax machines, answering machines etc? If so, try disconnecting them one at a time to see if the problem disappears. |
| - | * Is there any disturbing appliances in the //very// close vicinity of the modem and its ADSL cable? | + | * Are there any disturbing appliances in the //very// close vicinity of the modem and its ADSL cable? |
| - | If no obvious source for the disturbance is to be found, and it happens frequently, the Internet (or ADSL line) provider's support should be consulted. | + | If no obvious source for the disturbance is to be found, and it happens frequently, the Internet (or ADSL line) provider's support should be consulted. |
| + | The advanced user may consider to use the **Force SNR Margin** or even disable the **Retrain** parameter, see the [[web_gui:adsl_page#Advanced|ADSL settings]] page. | ||
| After a link drop the modem will constantly try to establish the connection again, without any user intervention: | After a link drop the modem will constantly try to establish the connection again, without any user intervention: | ||
| - | * If the dots remain on the front panel display, there is a constant disturbance or a broken cable connection which must be fixed. | + | * If the dots remain on the front panel display, there is a constant disturbance or a broken cable connection that must be fixed. |
| - | * If the retrain is successful, and the link is established, the rolling figure-of-eight plus "''**IP**''" reappears and the modem starts renewing its IP address again, as has been described above. | + | * If the retrain is successful and the link is established, the rolling figure-of-eight plus "''**IP**''" reappears and the modem starts renewing its IP address again, as has been described above. |
