When using an oscilloscope to look at SDLC Port 1 signals on a TS2 cabinet, the expected waveform on a healthy bus is approximately:

1. A NRZI-coded differential signal at roughly 153.6 kbps with consistent voltage levels
2. A 60 Hz sine wave at 120 VAC
3. A 1 MHz clock signal at 5 V TTL
4. A 24 V DC steady level