TY  - GEN
AU  - Kessler, Gary C.
TI  - ISDN: Concepts, Facilities and services
SN  - 0071139338
U1  - 621.382 
PY  - 1993///
CY  - USA
PB  - The McGraw-Hill
KW  - 1. Integrated services digital networks
N1  - Includes bibliographical references
ER  -