Terminology » Mobile Communication » CT0, CT1, CT2 Cordless Phones: Standards & Differences

CT0, CT1, CT2 Cordless Phones: Standards & Differences

cordless telephone analog communication ct standard wireless technology frequency division

This article breaks down the key differences between the CT0, CT1, and CT2 analog cordless telephone standards. “CT” is simply short for “Cordless Telephone.” Let’s dive in.

CT0

Here’s a look at the characteristics of the CT0 analog cordless telephone standard:

  • Mobile Frequency (MHz): Varies significantly by region:
    • UK: 2/48
    • France: 26/41
    • Australia: 30/39
    • Netherlands & Spain: 31/40
    • China, South Korea, Taiwan, USA: 46/49
    • China (again): 48/74
  • Duplex Scheme: FDD (Frequency Division Duplexing)
  • Multiple Access Type: FDMA (Frequency Division Multiple Access)
  • Number of Channels: Typically 10, 12, 15, 20, or 25
  • Channel Spacing (KHz): 1.7, 20, 25, or 40
  • Modulation Technique: FM (Frequency Modulation)

CT1 and CT1+

Now, let’s examine the features of the CT1 and CT1+ cordless telephone standards:

  • Mobile Frequency (MHz):
    • CT1: 914 and 960
    • CT1+: 885 and 932
  • Duplex Scheme: FDD (Frequency Division Duplexing)
  • Multiple Access Type: FDMA (Frequency Division Multiple Access)
  • Number of Channels:
    • CT1: 40
    • CT1+: 80
  • Channel Spacing (KHz): 25
  • Modulation Technique: FM (Frequency Modulation)

CT2 and CT2+

Finally, we’ll explore the characteristics of the CT2 and CT2+ analog cordless telephone standards:

  • Mobile Frequency (MHz):
    • CT2: 864 and 868
    • CT2+: 944 and 948
  • Duplex Scheme: TDD (Time Division Duplexing)
  • Multiple Access Type: TDMA/FDM (Time Division Multiple Access / Frequency Division Multiplexing)
  • Number of Channels: 40
  • Channel Spacing (KHz): 100
  • Users per Channel: One
  • Modulation Technique: GFSK (Gaussian Frequency-Shift Keying), using a 0.5 Gaussian filter
  • Channel Data Bit Rate (Kbps): 72