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what does the "rail" mean

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alpacinoliu

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my english is very poor, so I have a few questions about rail while i am reading spec about lvds

rail:
• Bus LVDS eliminates the need for a special termination pull-up rail
• Utilizes common power supply rails (3.3V or 5V)
 

- no pull-up resistors are required, only 100Ω termination (buses such as I2C require pull-up resistors connected to +Vcc/Vdd ..)
- transmitters and receivers can be supplied of standard 3.3V or 5V line(rail) ..
 
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