From Next Generation SONET/SDH
3.2.2 Packet Networks
Packet networks offer integrated multiple service levels at a quality agreed upon by
the service provider and the client, based on a service level agreement (SLA). Packet
networks perform bandwidth management, buffering (queuing), scheduling, routing
and dynamic rerouting, policing, and traffic shaping.
Bandwidth management consists of functions such as the Call Admission Control,
Class of Service Routing, and Signaling. CAC is performed per service level.
Routing requires knowledge of the complete network topology in terms of available
bandwidth per service level and it executes shortest path algorithms (e.g., traveling
salesman algorithm). When the optimum route has been identified, it forms a routing
database. Routing also executes scheduling algorithms and simple or complex
queuing algorithms per SLA. Dynamic rerouting may also be performed during service.
Policing provides a provisioned mechanism at the entry point (edge) of the network
to verify and also control subscriber traffic parameters in terms of the SLA.
Traffic shaping is a buffered function that smoothes the traffic exiting the system
to ensure compliance with the agreed-upon profile, and by proper bandwidth management
it avoids congestion situations.
Packet networks assemble a number of client data bytes (or octets) into a payload
block, attach overhead...
Products & Services
Topics of Interest
3.2.3 Timing Aspects In modern networks, the bit rate has exceeded by far the gigabit per second rate and, therefore, the performance of timing circuitry must meet stringent specifications.
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