Nostr

DYK? Cellphones are basically networked radios.

Currently, there are two major standards in use around the world:

CDMA vs. GSM: What’s the Difference?

CDMA (Code Division Multiple Access) and GSM (Global System for Mobile Communications) are two popular mobile network technologies:

1. Technology Approach:

• CDMA assigns a unique code to each call, allowing multiple users on the same channel.

• GSM uses time slots (TDMA) and frequencies (FDMA) to separate users.

2. SIM Cards:

• CDMA phones traditionally didn’t use SIMs (device-specific).

• GSM phones always use SIM cards, making it easy to switch devices.

3. Global Reach:

• GSM is widely adopted worldwide, ideal for global roaming.

• CDMA is more regional, mainly used in the US and parts of Asia.

4. Data & Speed:

• CDMA often provided faster data rates in 3G.

• GSM became more versatile with 4G LTE, leveling the playing field.

In today’s world, 4G LTE and 5G have mostly unified these differences, with most carriers supporting SIM-based LTE systems.

#TechTalk #MobileNetwork #CDMAvsGSM #cellphones #lte #gsm #cdma

https://techdifferences.com/difference-between-gsm-and-cdma.html

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Discussion

Sovereign Origin 🥕 1y ago

Uhhh

Bunch of wrong info here i think

CDMA is a network access technology, a signal modulation technique used to enable resource sharing. As far as I know variants of CDMA have been used in 3G, 4G, 5G and this will continue in 6G. 2G constitutes GPRS and EDGE as data standards created by the GSM group, a standardising Committee of old. Now we have xGPP committees doing the same. GSM usually refers (in popular usage of the term) to a voice network. All use licensed bands. FDD and TDD (FDMA and TDMA) can be used orthogonal to CDMA and are also used to separate TX and RX from one radio to avoid self interference.

Sovereign Origin 🥕 1y ago

Also SIM cards are just a network identifier code that you carry on the device. I think its codes are transmitted to the towers for all these standards, and most commonly operators require you to use one to allow handover between commercial networks and countries. It has nothing much to do with protocol level requirements or modulation standards like CDMA.