Signalling System No. 7 | Railway signalling | Ordinary differential equation | ordinary differential equation | British absolute block signalling | Prym differential | power series solution of differential equations | Non-Facility Associated Signalling | Naval flag signalling | Mechanical ''2 position'' semaphore signalling at North Geelong railway station | Magnetic Drum Digital Differential Analyzer | Low-voltage differential signaling | Locking differential | List of differential geometry topics | Hyperbolic partial differential equation | differential topology | differential interference contrast microscopy | Differential geometry of surfaces | Differential diagnosis |
Signals are often transmitted over balanced connections using the differential mode, meaning the wires carry signals of opposite polarity to each other (for instance, in an XLR connector, pin 2 carries the signal with normal polarity, and pin 3 carries an inverted version of the same signal).