TY  - BOOK
AU  - Helvoort , Huub. Van
TI  - Next generation sdh/sonet ,evolution or revolution
SN  - 0-470-09120-7
U1  - 621.3821 HEL 
PY  - 2005///
CY  - ENGLAND
PB  - JOHN WILEY
KW  - SYNCHRONOUS DIGITAL HIERARCHY-DATA TRANSMISSION.SONET-DATA TRANSMISSION.SDH
ER  -