Method and apparatus for converting between byte lengths and burdened burst lengths in a high speed cable modem
First Claim
1. A method for processing requests to transmit data packets upstream from a cable modem to a cable headend, the method comprising the steps of:
- receiving burst profiles successively at the cable modem;
storing a data packet to be transmitted upstream, the data packet having a given transmission data byte length value;
calculating a set of physical data length values corresponding to respective transmission data byte length values each time that a new burst profile is received;
storing the calculated set of physical data length values in memory so they can be retrieved from the transmission data byte length values each time that a new burst profile is received to replace a previously calculated set of physical data length values;
retrieving the physical data length value corresponding to the given transmission data byte length value from the stored set; and
transmitting from the cable modem a request message that includes the retrieved physical data length value.
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Accused Products
Abstract
Requests are processed to transmit data packets upstream from a cable modem to a cable headend in a manner that minimizes the use of CPU operations and/or memory capacity. Data packets to be transmitted upstream are stored at the cable modem. The data packets each have a given transmission data byte length value. Burst profiles are received successively at the cable modem. Each time a new bust profile is received, a set of physical data length values corresponding to respective transmission data byte length values is calculated from the parameters of the received burst profile. The calculated set of physical data length values is stored in memory so the individual values can be retrieved from the transmission data byte length values again and again, rather than being re-calculated each time a conversion is made from transmission data byte length values to physical data length values. The same set of physical data length values is used until a new burst profile is received by the cable modem.
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Citations
1 Claim
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1. A method for processing requests to transmit data packets upstream from a cable modem to a cable headend, the method comprising the steps of:
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receiving burst profiles successively at the cable modem;
storing a data packet to be transmitted upstream, the data packet having a given transmission data byte length value;
calculating a set of physical data length values corresponding to respective transmission data byte length values each time that a new burst profile is received;
storing the calculated set of physical data length values in memory so they can be retrieved from the transmission data byte length values each time that a new burst profile is received to replace a previously calculated set of physical data length values;
retrieving the physical data length value corresponding to the given transmission data byte length value from the stored set; and
transmitting from the cable modem a request message that includes the retrieved physical data length value.
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Specification