The Local Loop
analog (voice~local loops)
- modem - codec (coder/decoder) at end office
analog versus digital (trunks)
- signal regeneration with no information loss
- voice, data, music, images, video
- higher data rates on existing lines
- digital cheaper to achieve accurate reproduction
- digital cheaper to debug and maintain
modems (data)
- attenuation, distortion, noise
- amplitude, frequency and phase modulation
- half duplex, full duplex, RS-232, DTE, DCE