Next Generation SDH/SONET
Subtitle: Evolution or Revolution
Publisher: Wiley
Published: April 29, 2005
Language: eng
Number of pages: 254
ISBN-13: 9780470091203
First sentence: During the evolution of digital multiplexes, e.g. from the primary rate multiplexes 2048 kbit/s E1 and 1544 kbit/s DS1 up to the fourth order multiplexes 139.264 Mbit/s E4 and 274.176 Mbit/s DS4, in general referred to as Pleisiochronous Digital Hierarchy (PDH) signals, it became clear that the application of these multiplexes in larger networks required an improvement of the network synchronisation and a better Operations, Administration and Maintenance (OA&amp;M) structure.