DSL ring signal compatibility
View Patent ↗A method of detecting that a condition exists that adversely impacts a digital subscriber line service (DSL) over a telephone line shared by the DSL service and a telephone service. The method includes obtaining information regarding operation of the DSL service over a plurality of different time periods, comparing the information for a first of the plurality of time periods with the information for a second of the plurality of time periods, and determining the condition exists based on the comparison.
1. A method of detecting and mitigating a condition which adversely impacts a digital subscriber line service (DSL) over a telephone line shared by the DSL service and a telephone service, comprising:
obtaining information regarding operation of the DSL service over a plurality of different time periods;
comparing the information for a first of the plurality of time periods during which an event is present on the line with the information for a second of the plurality of time periods, wherein the event can trigger or indicate existence of the condition;
determining the condition exists based on the comparison; and
modifying the event to minimize the extent to which the event can trigger existence of the condition when present on the line.
2. The method of claim 1 , wherein the event is a telephone ring signal and wherein the event is absent during the second of the plurality of time periods, the method further comprising obtaining a telephone ring signal timestamp to identify the first time period during which the telephone ring signal is present on the line.
3. The method of claim 1 , wherein obtaining information regarding operation of the DSL service over a plurality of different time periods comprises obtaining the information from at least one of a DSL access multiplexor (DSLAM) and a customer premises equipment (CPE) modem.
4. The method of claim 1 , wherein the information regarding operation of the DSL, service includes one or more of the following parameters: upstream code violations, downstream code violations, upstream forward error correction (FEC) codeword-correction indicators, downstream FEC codeword-connection indicators, upstream errored seconds, downstream errored seconds, upstream attenuation, downstream attenuation, upstream margin, downstream margin, Hlog per tone, bit distribution per tone, QLN per tone, and a non-linearity indicator.
5. The method of claim 4 , wherein determining the condition exists based on the comparison comprises determining the condition exists when the comparison indicates a value for at least one of the parameters increases significantly during the first time period as compared to the second time period.
6. The method or claim 1 , wherein the event is at least one of a non-linear disturbance on the line, or is further present during the second plurality of time periods.
7. An apparatus comprising:
voiceband equipment;
a digital subscriber line (DSL) modem;
a splitter coupled to the voiceband equipment, the DSL modem, and a network device to pass low frequency signals received from a telephone line coupled to the network device to the voiceband equipment and to pass high frequency signals received from the telephone line to the DSL modem; and
a management entity to:
obtain information regarding operation of a DSL, service involving the DSL modem and the telephone line over a plurality of different time periods;
compare the information for a first of the plurality of time periods during which an event is present on the line with the information for a second of the plurality of time periods, wherein the event can trigger or indicate existence of the condition;
determine the condition exists based on the comparison; and
modify the event to minimize the extent to which the event can trigger existence of the condition when present on the line.
8. The apparatus of claim 7 wherein the existence of the condition comprises the splitter malfunctioning, or the network device disrupting the telephone line.
9. The apparatus of claim 7 , further comprising a conditioning device coupled to the telephone line to minimize the extent to which the event can trigger existence of the condition when present on the line.
10. The apparatus of claim 9 , wherein the conditioning device is at least one of a telephone ring signal conditioning device that modifies the ring signal such that it minimizes disruption introduced by the network device or an impedance conditioning device that modifies impedance to minimize disruption introduced by the network device.
11. The apparatus of claim 10 , wherein the telephone ring signal conditioning device can be coupled in parallel between the splitter and the voiceband equipment, integrated in series in the voiceband equipment, integrated into the splitter, integrated into the DSL modem, or integrated with the splitter into the DSL, modem.
12. The apparatus of claim 11 , wherein the telephone ring signal conditioning device is to reduce high voltage effects that might otherwise cause the network device to operate in a manner that adversely affects the operation of the DSL service.
13. The apparatus of claim 10 , wherein the telephone ring signal conditioning device comprises:
a connector that couples the ring signal conditioning device to the telephone line wherein the connector may be dedicated to the ring signal conditioning device or shared with the voiceband equipment, splitter, or DSL modem; and
a ring signal modification circuit coupled to the connector to mitigate DSL modem operation problems created by a disruptive network device and high voltage in the telephone ring signal, wherein the impedance,
or wherein the impedance conditioning device comprises:
a connector to connect the impedance conditioning device to the telephone line, wherein the connector may be dedicated to the impedance conditioning device or shared with the voiceband equipment, splitter, or DSL, modem; and
an impedance modification circuit coupled to the connector to mitigate DSL modem operation problems created by a disruptive network device.
14. The apparatus of claim 13 , wherein the ring signal modification circuit is to have an effect on the ring signal that is inversely proportional to a length of the telephone line, or the impedance modification circuit is to have an effect on a ring signal that is inversely proportional to the length of the telephone line.
15. The apparatus of claim 10 , wherein the impedance conditioning device is to lower or otherwise modify impedance terminating at the DSL, modem as a result of any nonlinear disturbance on the telephone line.