Title :
A complete VLSI treatment for the LAPD protocol (ISDN level 2)
Author :
Ferreira, Luís Roberto
Author_Institution :
Centro de Pequisa e Desenvolvimento-Telebras, Sao Paulo, Brazil
Abstract :
A set of ICs that can execute the bearer functions of one user network in an ISDN has been developed. This set consists of two chips for treatment of the physical layer (layer 1 of the OSI Reference Model) of the S and U interfaces, one chip for terminal adaptation and one chip for treatment of the link layer protocol carried by the D channel, the so called LAPD. The development of two of these chips is discussed. The first is the U interface layer 1 chip. The second, called TB22, is for the treatment of the signaling layer 2 function at D channel. Designed as a full custom ASIC, TB22 uses CMOS 1.25-μm technology and has around 50000 transistors. A large demand for this device is expected
Keywords :
CMOS integrated circuits; ISDN; VLSI; application specific integrated circuits; protocols; 1.25 micron; CMOS; D channel; ISDN level 2; LAPD protocol; OSI Reference Model; S interface; TB22; U interface layer 1 chip; bearer functions; full custom ASIC; layer 1; link layer protocol; one user network; physical layer; signaling layer 2 function; terminal adaptation; two-chip set; Application specific integrated circuits; Digital control; Digital integrated circuits; Graphics; ISDN; Integrated circuit technology; Protocols; Silicon; Telecommunication switching; Very large scale integration;
Conference_Titel :
ASIC Seminar and Exhibit, 1990. Proceedings., Third Annual IEEE
Conference_Location :
Rochester, NY
DOI :
10.1109/ASIC.1990.186097
