DWDM Fundamentals, Components, and Applications
This leading-edge resource provides comprehensive, up-to-date coverage of the principles, technologies, standards, and applications of dense wavelength division multiplexing (DWDM).
TABLE OF CONTENTS DWDM Fundamentals, Components, and Applications
6.4: Some Definitions Used for Interconnection Performance Characterization
6.4 Some Definitions Used for Interconnection Performance Characterization
We use the definitions given in [48] for the interconnects.
6.4.1 Bandwidth, Effective Bandwidth, Aggregate Bandwidth
The bandwidth is the maximum number of bits that can be transmitted per unit of time. This is the effective bandwidth of the useful data bits, not including the redundant information (logic-level error correction). The aggregate bandwidth is the total bandwidth of the parallel interconnects: ? bandwidths (bandwidth of individual interconnect number of interconnects, for interconnects with identical bandwidths).
6.4.2 Signaling Rate
It is the maximum number of transitions that can take place per unit of time. It is expressed in bauds. Without data encoding (nonreturn-to-zero, NRZ signaling) bandwidth and signaling rate are equal. But if there is clock or low-level redundant information encoded in the transmitted signal, and with other encoding, it is no longer true. For example, with Manchester encoding the peak signaling rate is twice the bandwidth.
6.4.3 Latency
The latency is the time spent to get the electrical information bit input at the sender location (at the output of a standard cell logic gate) available as an electrical information bit output at the receiver end (at a standard logic level). For NRZ, it consists of the delay of the driver circuit, the optoelectronic delay of the light source modulation, the duration of light propagation, and the optoelectronic delay at the receiving end, including the electrical amplifier delay.
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