Try the web sites of testing equipment manufacturers.
Different patterns will test for different faults. Each pattern has an analog equivelant. This is important when checking for 'bridge tap'. Each tap acts like a bandpass filter. All data not within the pass band will be transported error free. Data within the pass band will be corrupted. So when searching for bridge tap, a series of data patterns must be used in order to test all frequency bands.
A test pattern of 'all ones' (0xffff) is useful for testing repeaters. It requires a lot more effort for a repeater to create a one than it does for a zero. A high ones density will test the repeater's ability to function under difficult situations.
A data pattern of 'all zeros' (0x0000) is useful in testing the clocking of a circuit. Ones in the data stream are used to reset the clock. After each reset, the clock drifts toward it's free run frequency until another 'one' resets it. If the ones density is too low and the oscillator is too far off, the clock will drift beyond the pulse width. When this occurs, the receiver does not detect a pulse within the pulse period and data is lost.
Hope this helps.
