Method and apparatus for reducing transmission errors caused by periodic transients in digital subscriber line (DSL) communication systems
A transient pre-emptor includes a processor configured to detect transients in a communications system. After the processor detects a transient in the communications system, it causes a data communications equipment to suspend or reduce data transmission during the occurrence of a subsequent transient.
1 . A method for reducing transmission errors in a data communications equipment, the method comprising the steps of:
collecting data describing a transient;
determining a rate adjustment time based on the collected data; and
adjusting, at the rate adjustment time, a transmission rate associated with the data communications equipment.
2 . The method of claim 1 , further comprising the steps of:
determining, based on the collected data, an expected occurrence time of a subsequent transient start; and
reducing, at the expected occurrence time of the subsequent transient start, the transmission rate from a first value.
3 . The method of claim 2 , further comprising the steps of:
determining, based on the collected data, an expected occurrence time of a subsequent transient end; and
restoring, at the expected occurrence time of the subsequent transient end, the transmission rate to the first value.
4 . The method of claim 1 , further comprising the step of detecting the transient, and wherein the collecting step is responsive to the detecting step.
5 . The method of claim 4 , further comprising the step of:
responsive to the detecting, reducing the transmission rate from a first value.
6 . The method of claim 5 , wherein the reducing step reduces the transmission rate to zero.
7 . The method of claim 5 , further comprising the step of:
restoring the transmission rate to the first value.
8 . The method of claim 1 , wherein the collecting data step occurs over a predetermined length of time.
9 . The system of claim 1 , wherein the collected data comprises at least one of transient duration, transient magnitude, and transient cadence.
10 . A computer-readable medium having a program for reducing transmission errors in a data communications equipment having a current transmission rate, the program comprising the steps of:
collecting data describing a transient;
determining a rate adjustment time based on the collected data; and
adjusting, at the rate adjustment time, a transmission rate associated with the data communications equipment.
11 . The computer-readable medium of claim 10 , the program further comprising the steps of:
determining, based on the collected data, an expected occurrence time of a subsequent transient start; and
reducing, at the expected occurrence time of the subsequent transient start, the transmission rate from a first value.
12 . The computer-readable medium of claim 11 , the program further comprising the steps of:
determining, based on the collected data, an expected occurrence time of a subsequent transient end; and
restoring, at the expected occurrence time of the subsequent transient end, the transmission rate to the first value.
13 . The computer-readable medium of claim 10 , the program further comprising the steps of:
detecting the transient; and
responsive to the detecting, reducing the transmission rate of the data communications equipment from a first value.
14 . The computer-readable medium of claim 13 , the program further comprising the step of:
restoring the transmission rate to the first value.
15 . The computer-readable medium of claim 10 , wherein the collected data comprises at least one of transient duration, transient magnitude, and transient cadence.
16 . A system for reducing transmission errors in a data communications equipment having a current transmission rate, the system comprising the steps of:
means for collecting data describing a transient;
means for determining, based on the collected data, a rate adjustment time; and
means for adjusting, at the rate adjustment time, a transmission rate associated with the data communications equipment.
17 . The system of claim 16 , further comprising:
means for determining, based on the collected data, an expected occurrence time of a subsequent transient start; and
means for reducing, at the expected occurrence time of the subsequent transient start, the transmission rate from a first value.
18 . The system of claim 17 , further comprising:
means for determining, based on the collected data, an expected occurrence time of a subsequent transient end; and
means for restoring, at the expected occurrence time of the subsequent transient end, the transmission rate to the first value.
19 . The system of claim 16 , further comprising:
means for detecting the transient; and
means for reducing the transmission rate from a first value,
wherein the means for reducing is responsive to the means detecting.
20 . The system of claim 19 , further comprising
means for restoring the current transmission rate to the first transmission rate.