?– Provide a protection mechanism that is independent of client and transmission
rate and format.
?– Support prioritization of clients enforced during transmission channel failures.
In recent years, the International Telecommunications Union (ITU-T) has approved
several standards that have allowed this evolution to occur. These standards are
?– Generic Framing Procedure (GFP)
?– Virtual Concatenation (VC)
?– Link Capacity Adjustment Scheme (LCAS)
With the introduction of these standards, circuit bonding was created, providing an
effective way to carry Ethernet traffic over the existing TDM network. circuit bonding
extends the life of the current transport network by allowing carriers to introduce new
services over legacy equipment. With the advent of circuit bonding, the TDM network
has evolved and can now carry Ethernet traffic. The focus of this chapter is to highlight
how circuit bonding provides effective, efficient, and transparent transport of multiple
service formats. In essence, circuit bonding is able to transport TDM and data protocols
via any line interface, whether optical or copper. In the access portion of the network,
circuit-bonding systems can be used to efficiently transport Ethernet via DS1s, E1s,
DS3s, or OC-ns.
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