ITM 301 Lecture Notes - Lecture 7: Transport Layer, Network Interface Device, X.25

• School: Ryerson University
• Department: Information Technology Management
• Course: ITM 301
• Professor: Nurul Huda

Document Summary

Pstn (public switched telephone network): network of lines providing telephone service. Co (central oice): where tele companies terminate lines. Local loop: distance connecing residents, businesses to the nearest central oice (digital or analog) Digital local loop: fiber to the home (giber to the premises) Pon (passive opical network): carrier uses iber-opic cabling to connect muliple endpoints. Opical line terminal: single endpoint at co in a pon. Opical network unit: distributes signals to muliple endpoints. X. 25 itu standard: veriies transmission at every node (designed for long distance) Both x. 25 and frame rely perform error checking. Both use virtual circuits (node connecions with physical links) Both conigurable as svcs (switched virtual circuits) connecion established for transmission. terminated ater. Both conigurable as pvcs (permanent virtual circuits) connecion establish before transmission, remains ater. T1: 24 voice/data channels. connects branch oice and carrier. T3: 672 voice/data channels. data-intensive businesses. expensive (28 imes more throughput)