AMPS, TACS, and NMT: Analog Cellular Standards Explained

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This page will delve into the differences between AMPS, TACS, and NMT, all of which are analog cellular telephone standards. Let’s break down each one.

  • AMPS: Stands for Advanced Mobile Phone System.
  • TACS: Stands for Total Access Communication System.
  • NMT: Stands for Nordic Mobile Telephone.

AMPS (Advanced Mobile Phone System)

Here are the key features of the AMPS standard, including NAMPS (Narrow Band AMPS):

  • Mobile Transmit/Receive Frequency: 824 to 849 MHz (Transmit) and 869 to 894 MHz (Receive)
  • Duplex Scheme: FDD (Frequency Division Duplexing)
  • Multiple Access Scheme: FDMA (Frequency Division Multiple Access)
  • Number of Channels: 832 in AMPS and 2496 in NAMPS
  • Number of Users Per Channel: One
  • Spacing Between RF Channels: 30 KHz in AMPS and 10 KHz in NAMPS
  • Modulation Scheme: FM (Frequency Modulation)

TACS (Total Access Communication System)

The following outlines the characteristics of the TACS standard:

  • Mobile Transmit/Receive Frequency:
    • ETACS: 916 to 949 MHz (Receive) and 871 to 904 MHz (Transmit)
    • NTACS: 860 to 870 MHz (Receive) and 915 to 925 MHz (Transmit)
  • Duplex Scheme: FDD
  • Multiple Access Scheme: FDMA
  • Number of Channels: 1240 in ETACS and 400 in NTACS
  • Spacing Between RF Channels: 25 KHz in ETACS and 12.5 KHz in NTACS

NMT (Nordic Mobile Telephone)

Below are the features that define the NMT standard:

  • Mobile Transmit/Receive Frequency:
    • NMT-450: 463 to 468 MHz (Receive) and 453 to 458 MHz (Transmit)
    • NMT-900: 935 to 960 MHz (Receive) and 890 to 915 MHz (Transmit)
  • Duplex Scheme: FDD
  • Multiple Access Scheme: FDMA
  • Number of Channels: 200 in NMT-450 and 1999 in NMT-900
  • Spacing Between RF Channels: 25 KHz in NMT-450 and 12.5 KHz in NMT-900

3G UMTS Call Setup Success Rate (CSSR) Calculator

Calculate the Call Setup Success Rate (CSSR) for 3G UMTS networks. Understand the formula, factors affecting CSSR, and target values for optimal network performance.

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AMPS Tutorial: Basics, Frame Structure, and Call Setup

AMPS Tutorial: Basics, Frame Structure, and Call Setup

Learn the fundamentals of AMPS, including its frequency spectrum, system specifications, frame structure, and call setup procedure. Explore the 1G analog system developed by AT&T.

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