| A | B |
|---|
| Frequency | The number of cycles of complete cycles of current occuring in one second. |
| Bandwidth (Digital) | relates to the number of bits per second or speed |
| Bandwidth (Analog) | relates to the number of cycles per second or Hertz |
| Telephone bandwidth | is in the range from 300Hz to 3400Hz |
| Digital signals | are normally descrete values and are referred to as binary signals |
| Octet | is a digital 8-bit word |
| A/D converter | converts analog to digital |
| Analog | is prone to noise from electromagnetic sources |
| Digital | is essentially noise free |
| Digital systems | use regenerators |
| Analog systems | use repeaters |
| A message | contains either a user message or control/signaling information |
| D/A converter | converts digital to anaolg |
| A human being understands | analog signals |
| The three phases of PCM are | Sampling, Quantizing, Encoding |
| Voice quality improves if you increase the | sampling rate |
| A Quantized signal | is an analog signal |
| An Encoded signal | is a digital signal (8-bit word) |
| The DS0 rate is | 64 Kbps |
| The DS1 rate is | 1.544 Mbps |
