Transparency is maintained. And carrier class end-to-end transmission
layer management is available.
Figure 10.7 Using circuit bonding with DS-3 transport
Digital
radio link
Circuit-bonded system
Existing SONET
neatwork
SONET
NE
DS-3
DS-3
DS-3
OC-N GbE GbE
Ethernet client
device
10/100 10/100
Ethernet client
device
DLC facility
Figure 10.8 Using circuit bonding with copper facilities
Copper facilities
Circuit-bonded system
DS-1
DS-3
E-1
GbE GbE
Ethernet client
device
10/100 10/100
Ethernet client
device
TDM: Circuit Bonding 275
Carrier Ethernet
Ethernet services in the MAN can take on a number of forms, and the service can
be described by a number of parameters. From the perspective of providing Carrier
Ethernet transport service in the MAN, the following is a list of the most important
characteristics as defined by the Metro Ethernet Forum (MEF):
?– Protection
?– Hard QoS
?– Backward compatibility
?– Service management
?– Scalability
These topics will be discussed in more detail in the following sections.
Protection Ethernet networks are generally protected using the Spanning Tree Protocol
per IEEE 802.
Pages:
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661