- man influences
- smaller user population; cost amortization not as effective
- management and operation costs are pressured from above
- traffic is unknown and changing.
- man topology
- a two-step hierarchy
- metro core (or interoffice) ring.
- eight nodes, 300 km diameter, meshed (complete) architecture, runs
at 2.5 and 10 gbits/sec per wavelength
- a metro access (or collector) ring, hubbed architecture, runs at 45,
100, 155, 266 mbits/sec.
- eight nodes, 100 km diameter
- One or more collectors are connected to an interoffice ring.
- The interoffice ring also has connections to one or more backbones.
- ring transport
- older sonet networks are not all optical, and are optimized for voice
only
- next-generation sonet has competition from gigabit ethernet and
resiliant packet rings
- all integrate with wavelength division multiplexing
This page last modified on 23 November 2004.