TY  - BOOK
AU  - Held,Gilbert
TI  - Understanding data communications
SN  - 0672322161
AV  - TK5105 H442U 2002
PY  - 2002///
CY  - Boston, Mass
PB  - Addison-Wesley
KW  - DATA TRANSMISSION SYSTEMS
KW  - COMPUTER NETWORKS
N1  - Includes bibliographical references and index
ER  -