ISDN signal transmission performance monitoring
First Claim
1. A performance monitoring system for determining if a signal transmission error has occurred during signal transmission between an access line and a network trunk line, the access line terminating at a line card which is mounted in an access line shelf, the access line shelf also including common equipment wherein the network trunkline terminates, wherein words on the network trunk line each correspond to a data byte and a performance monitoring byte on the line card, said data byte containing data to be transmitted between the access line and the network trunk line and said performance monitoring byte containing performance monitoring data for determination of whether or not a signal transmission error has occurred, said performance monitoring system comprising:
- receive logic means for determining if a signal transmission error has occurred during signal transmission from the network trunk line to the access line; and
transmit logic means for determining if a signal transmission error has occurred during signal transmission from the access line to the network trunk line.
1 Assignment
0 Petitions
Accused Products
Abstract
During ISDN signal transmission from a network trunk line (21) to an access line (18), a word (202) provided from the network trunk line is broken into two bytes including a data byte (205) and a performance monitoring byte (206). After signal transmission through common equipment (14) and an access line shelf (10), a line card (12) verifies the composite parity of the data byte and the performance monitoring byte to determine if an ISDN signal transmission error has occurred. During ISDN signal transmission from an access line (18) to a network trunk line (21), the line card (12) forms a data byte (305) by combining pairs of data bits from the access line, and simultaneously forms a performance monitoring byte (306) by combining pairs of performance monitoring bits corresponding to the pairs of data bits. After signal transmission of the data byte and performance monitoring byte through the access line shelf and common equipment, logic (65) is provided to determine if an ISDN signal transmission error has occurred. Thereafter, a word (302) is formed on the network trunk line, the word being made up of two bytes including the data byte and a second byte having a parity bit. The parity bit is set equal to the parity of the word if it is determined that a signal transmission error has not occurred and the parity bit is set opposite of the parity of the word if it is determined that a signal transmission error has occurred.
-
Citations
30 Claims
-
1. A performance monitoring system for determining if a signal transmission error has occurred during signal transmission between an access line and a network trunk line, the access line terminating at a line card which is mounted in an access line shelf, the access line shelf also including common equipment wherein the network trunkline terminates, wherein words on the network trunk line each correspond to a data byte and a performance monitoring byte on the line card, said data byte containing data to be transmitted between the access line and the network trunk line and said performance monitoring byte containing performance monitoring data for determination of whether or not a signal transmission error has occurred, said performance monitoring system comprising:
-
receive logic means for determining if a signal transmission error has occurred during signal transmission from the network trunk line to the access line; and transmit logic means for determining if a signal transmission error has occurred during signal transmission from the access line to the network trunk line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method for determining if a signal transmission error has occurred during signal transmission between an access line and a network trunk line, the access line terminating at a line card mounted in an access line shelf, the access line shelf also including common equipment wherein the network trunkline terminates, wherein words on the network trunk line each correspond to a data byte and a performance monitoring byte on the line card, said data byte containing data to be transmitted between the access line and the network trunk line and said performance monitoring byte containing performance monitoring data for determination of whether or not a signal transmission error has occurred;
- the method comprising the steps of;
performing signal transmission from the network trunk line to the access line, including;
receiving said words from the network trunk line, breaking each one of said words into two corresponding bytes including said data byte and said performance monitoring byte, transmitting said corresponding bytes to the line card, and performing performance monitoring to determine if a signal transmission error has occurred; andperforming signal transmission from the access line to the network trunk line, including;
receiving pairs of data bits from the access line, combining said pairs of data bits into data bytes, generating pairs of performance monitoring bits combining said pairs of performance monitoring bits into performance monitoring bytes, transmitting corresponding pairs of data bytes and performance monitoring bytes to the common equipment, and performing performance monitoring to determine if a signal transmitting error has occurred. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
- the method comprising the steps of;
Specification