IST 233 Lecture Notes - Lecture 3: Circuit Switching, Network Performance, Data-Rate Units

• School: Syracuse University
• Department: Information Studies
• Course: IST 233
• Professor: David Molta

Document Summary

Network speed: three dimensions of network speed, throughput: upstream and downstream, the speed of the applications experience, upstream: performance from computer (upload, downstream: performance from network (downloading, latency: round-trip packet delay (lag) Jitter: variability of latency: perfect shower analogy, high throughput: lots of water pressure, low latency: hot water comes on quickly (very little waiting, low jitter: constant temperature (temperature varies from what is optimal, goes from hot to cold) Measuring network speed: network performance is critical for networked apps. We need accurate tools and measurements: network speed and throughput, measured in bits per second (bps, note lower-case b, bps= bytes per second (file transfer speed) (bps, note upper-case b) Network performance metrics: capital b= bytes and lower-case b =bits, 1 byte= 8 bits, 100 mbps= 100 * 8 (bytes, throughput is represented by metric designations, kbps= 1,000 bps, mbps= 1,000,000 bps, gbps= 1,000,000,000 bps.