ISDN signal transmission performance monitoring
US5477529A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 1994 |
| Grant date | Dec 19, 1995 |
| Priority date | — |
| Expiry date | Sep 29, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q11/045
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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 par…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.