Figure 10.6
shows how this can be achieved.
Figure 10.6 shows Ethernet connectivity using a circuit-bonding system over DS-1,
DS-3 transport, or SONET transport. Because circuit bonding separates the client layer
from the transport layer, Ethernet can be efficiently transported over a variety of parallel
transport mechanisms with the following benefits:
?– Transparency Circuit bonding allows complete decoupling of the client interface
and transport. A point-to-point Ethernet connection using a circuit-bonding system
will transport Ethernet frames from multiple clients over a variety of intermediate
transport mechanisms completely transparently.
?– Efficiency A circuit-bonding system can throttle Ethernet client speeds in
small increments, depending on the size of the transport pipe and the Ethernet bit
rate. This allows the service provider to offer ???fractional rate??? Ethernet services,
Figure 10.5 Various client types carried by circuit bonding
Transmission channels
Transmit
Receive
Client 1
Frames
Packet
Client 1
Client 2
Client 3
Client 2
TDM
Client 3
Packet
TDM: Circuit Bonding 273
instead of just 10, 100, or 1000 Mbps rates.
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