Telecom Interview Questions & Answers "IMPORTANT"

Telecom Interview Questions & Answers

What is ciphering

Ciphering modifies the contents of the eight interleaved blocks through the use of encryption techniques to the particular mobile station and base transceiver station.

Two types of ciphering algorithms, called A3 and A5, are used in GSM to prevent unauthorized network access and privacy for the radio transmission respectively.

Frequency Hopping & RF-Optimization Planning in Telecommunication.

Frequency Hopping

                                                         

           

FREQUENCY HOPPING

2G Layers,Power & Handover in Telecom

2G Layers,Power & Handover in Telecom

COMMUNICATION PROCESS

•        Each layer has its own specified functions and provides specific services for the layers above
•        It is important to define the interfaces between different layers and the functions within each layer.
•        The way a function is realized within a layer is not predicted.
•        Logically, the communication between functions always takes place on the same level according to the protocols for that level.

Telecom Interview Question & Answer.

(A)What is ciphering
Ciphering modifies the contents of the eight interleaved blocks through the use of encryption techniques to the particular mobile station and base transceiver station.
Two types of ciphering algorithms, called A3 and A5, are used in GSM to prevent unauthorized network access and privacy for the radio transmission respectively.
How many carrier frequencies are there in GSM-900 and DCS-1800? How much is the separation between the carrier frequencies?
124 carriers.
There are 8 channels in each carrier.
Channel separation is 200 KHz.
What is the Downlink and uplink spectrum is allocated to DCS-1800?
1800 MHz. Up link Frequency 1725-1780 MHZ.
Down link Frequency 1820-1870 MHz

Basic Wireless GSM Fundamentals

Basic Wireless GSM Fundamentals

Understanding GSM.

INTRODUCTION:-The Global System for Mobile Communications (GSM) is a set of recommendations and specifications for a digital cellular telephone network (known as a Public Land Mobile Network, or PLMN).