IS-136
Technology Overview
IS-136 is an evolution of the IS-54 standard. Both are known as Digital-AMPS (D-AMPS), a 2G technology used particularly in the United States and Canada. IS-136 – often also referred to as TDMA – was originally an important mobile radio communications standard in the Americas, but it has meanwhile been replaced by GSM/GPRS and CDMA2000 technologies.
D-AMPS transmits in the same 30 kHz frequency bands as the analog AMPS, which results in a smooth transition from an analog to a digital system. Voice data is compressed, allowing a partitioning into three timeslots. The voice capacity per channel is thus tripled.
Rohde & Schwarz measurement instruments allow a comprehensive test and measurement solution either as a non-signaling module test or as a device test in signaling mode. In addition, the company provides extensive support services that enable you to attain your goals.
Deployment Scenario
Mainly used as a circuit-switched voice service, D-AMPS also allows circuit-switched data, text messaging and an improved compression protocol. It was the first commercially available cellular system supporting security service using the CAVE encryption technology for voice and CMEA for data services.
Key Parameters
| IS-136 | |
|---|---|
| Frequency Range |
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|
| Modulation | π/4 DQPSK |
| Multiple Access | TDMA/FDMA |
| Duplex (Uplink/Downlink) | FDD |
| Channel Bandwidth | 30 kHz |
| Peak Data Rate | 48.6 kbit/s |
Standardization
IS-136 and IS-54 were both developed by the Electronic Industries Alliance (EIA) and the Telecommunications Industries Association (TIA), and later approved by the American Nationals Standards Institute (ANSI).
