Link Access Procedures, D channel
Encyclopedia
Link Access Procedures on the D channel (LAPD), specified in ITU-T
Q.920 and ITU-T
Q.921, is the second layer protocol on the ISDN protocol stack in the D channel
.
It is heavily based on HDLC.
ITU-T
The ITU Telecommunication Standardization Sector is one of the three sectors of the International Telecommunication Union ; it coordinates standards for telecommunications....
Q.920 and ITU-T
ITU-T
The ITU Telecommunication Standardization Sector is one of the three sectors of the International Telecommunication Union ; it coordinates standards for telecommunications....
Q.921, is the second layer protocol on the ISDN protocol stack in the D channel
D channel
D channel is a telecommunications term which refers to the ISDN channel in which the control and signalling information is carried.The bit rate of the D channel of a basic rate interface is 16 kbit/s, whereas it amounts to 64 kbit/s on a primary rate interface.For DSS1 signalling, the D channel...
.
It is heavily based on HDLC.
External links
- http://www.protocols.com/pbook/pdf/isdn.pdf
- http://www.itu.int/rec/T-REC-Q.920/en
- http://www.itu.int/rec/T-REC-Q.921/en