H ELECTRICITY
H04 ELECTRIC COMMUNICATION TECHNIQUE
H04Q SELECTING
H04Q11/00 Selecting arrangements for multiplex systems
H04Q11/0001 using optical switching
H04Q11/0062 Network aspects
H04Q11/0067 Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring