In this way, Ethernet as a transport technology has entered an uncharted
area where time division multiplexing (TDM)??“based technologies used to dominate
the market for many years, proving that optical access networks can be cost-efficient,
while maintaining simple management, flexible architecture, and high efficiency.
?– EPONs inherently carry Ethernet traffic, and thus no protocol conversion and
additional operations in the electrical domain are required when forwarding
subscriber-generated data streams (most of which are born natively in Ethernet
ports) toward MAN/WAN and core networks for further transmission. This is a
very important feature, since each protocol conversion adds complexity to the
overall transmission system, along with hidden costs in the form of specific equipment
(ATM, SONET, etc.), management problems, and conversion issues, as well
as more complex monitoring, fault detection, and removal. EPONs are, therefore,
perfectly suited for delivery of digital services from and toward subscriber equipment,
in what seems to be a user friendly and fully plug-and-play architecture, as
simple to set up as connecting your standard network cable to an ONU.
Pages:
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449