9
TRANSPORT NETWORKS
Transport networks consist of MAN or WAN networks, being commonly employed to interconnect different LAN, MAN, or telephone PABX. These types of networks may belong to either a telecommunications operator or be propriety of a certain organization.
Figure 9.1 depicts an example of a transport network (WAN or MAN type) using a ring topology, which is employed to interconnect different LAN. Depending on the type of technology, it may present different topologies. An important advantage of the ring topology relies on its redundancy, which translates in resistance from failures.
The transport networks can be grouped into the following categories:
• Permanent circuit: The main advantage of this type of connectivity relies on ...
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