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N E T W O R K E D S U R F A C E S James Scott and Frank Hoffmann {jws22, fh215}@cam.ac.uk - page 10 / 13

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10 / 13

Laboratory for Communications Engineering

Engineering Department

University Of Cambridge

AT&T Laboratories

CAMBRIDGE

Surface Busses

All busses must be true multi-drop

i.e. not Ethernet, which nowadays is hubbed

Low speed devices are catered for with I2C

RS-232 data can be packaged easily over I2C, using the handshaking P

High speed bus uses B-LVDS differential modulation

Differential scheme better for signal quality in noisy environment

Multiple B-LVDS busses are provided

this provides more bandwidth, and allows QoS to be supported

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