Highcliffe ICT Department

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Presentation transcript:

Highcliffe ICT Department Bus Highcliffe ICT Department

Bus Bus = A linear transmission medium E.G. Coaxial Cable Each PC on BUS has UNIQUE HARDWARE ADDRESS Means each PC can be INDENTIFIED

BASEband bus systems Each Transmission = a series of VOLTAGE PULSES Run the length of the BUS in BOTH DIRECTIONS Can be received by ANY PC on the BUS Voltage Pulses cease when they each the end of the BUS

Collisions When 2 PC’s transmit at the same time... VOLTAGE PULSES COLLIDE = Higher VOLTAGE SWINGS = Transmission UNREADABLE BUS = UNUSABLE until transmission ENDS

Frames System for reducing COLLISIONS uses FRAMES FRAME = limited number of PULSES Between a set MINIMUM & MAXIMUM to allow VOLTAGE RISE TO BE DETECTED

TRANSMISSION PROTOCOL Aims to REDUCE collisions CSMA/CD = popular protocol Carrier Sensitive Multiple Access with Collision Detection

RULES FOR CSMA/CD If BUS QUIET = Transmit Frame If BUS BUSY = wait for quiet then transmit immeadiately While transmitting MONITOR for COLLISION IF COLLISION - Transmit JAMMING signal & STOP After TRANSMITTING JAMMING Signal - WAIT then start again