Tuesday, April 25, 2017

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Differentiate between GSM and CDMA ?

GSM

- GSM uses multiple frequencies.

- Uses TDMA and FDMA for accessing signals.

- The voice rate is 9.6 KBPS.

- Uses less bandwidth.

CDMA

- CDMA uses single frequency as carrier.

- The voice rate is 14.4 KBPS.

- CDMA power control to access method is better as Phased Locked Loops are used.

- Follows soft handoff, hence call handling is more efficient.

What is broadband?


- Broadband is an internet access with high speed.

- Unlike dial-up connection, broadband connection is permanently connected.

- It allows internet and telephone calls to take place simultaneously. No new land line is required.

- Modulation is done in broadband on signals to transform data better.


What are the reasons for call drop?


A call drop occurs when

- Slips occur in media.

- There is some antenna tilting.

- Phone goes out of range.

- Electric and mechanic tilts occur.

- Signal interference occurs.



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