20 Common Telecom interview questions Part 2

Telecommunications interview questions and answers
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20 Most Common Telecommunications interview questions part 1

11-Describe about Asynchronous Transmission?

– It uses the start and stop bits for signifying the beginning bit of ASCII character that is to be transmitted.

– For instance, ‘0100 0001 would become ‘1 0100 0001 000 1 0’’.

– The additional one bit at the beginning and ending of the transmission refers the receiver that a character is entering and the character is ended.

– When data need to be sent intermittently, this method is used.

– The start and stop bits are supposed to be opposite polarity.

– By this process, the receiver recognizes the second packet of the information that is being sent.

12 Describe Synchronous Transmission?

– Synchronous transmission does not use start and stop bits, hence data transfer rate is quicker.

– The transmission is synchronized by speeding up at both the sending and receiving ends.

– This uses clock signals that are built at each component.

– Continual stream of data is sent between two nodes.

– Re-synchronization is one of the methods to address the lost bits.

– This method uses check digits instead of parity bits for ensuring the byte is correctly being interpreted and received.

13 Explain about Voice Over Internet Protocol?

– VOIP is also known as broadband telephony.

– VOIP is to route the voice conversations over the internet.

– VOIP services convert telephonic signals into digital signals.

– Voice traffic is transmitted over Internet Protocol based networks.

– VOIP deploys a protocol known as session control protocol for controlling the set-up and tear-down of calls as well as audio codecs.

14 What equipment is needed for VOIP?

Following are the equipment that is needed for VOIP.

– A Broadband connection.

– VOIP enabled telephones.

– Nexton Soft Switches

– A Router

– An Audiocodec

– An Astric server

– A dial-up connection can also be used for VOIP.

15-What are the advantages of VOIP?

Following are the advantages of VOIP:

– Call costs are cheaper than traditional telephone land line calls.

– Upgrading is simple.

– Can be integrated with existing telephone connection.

– Calls are free with VOIP PC-to-PC, irrespective of distance.

– Virtual number enables to make calls across the globe.

– Any number of geographical areas can be purchased, that works very cheap.

– Messaging is also possible with VOIP phone.

16-Describe about TTCN-3?

– Testing and Test Control Notation Version 3 is one of the strongly typed tests scripting language.

– It is used testing of communicating systems conformance.

– TTCN-3 is utilized for specification of test infrastructure interfaces.

– This process is implemented with concrete communication environments.

– TTCN-3 has standardized adapter interfaces.

17- Describe about RX Lev Full?

– RX Lev Full is Mobile transmit measurement report .

– This report is generated for every 480ms.

– The multi frame contains 104 TDMA frames.

– Among 104 frames 4 TDMA frames are used for decoding the BSIC.

– Remaining frames are used for serving and neighboring cells.

– The measurement of these remaining TDMA frames is RX Lev Full.

18-What is the functionality of TCSM?

– TCSM is an acronym for Transcoder/Sub-Multiplexer.

– Interface traffic is carried through the radio frequency in the air.

– Data is compressed for efficient transmission of data.

– Original data of 64 KBPS on interface side is compressed to 13 KBPS on the air.

– The compression is done by TCSM.

19-What is Simple Network Management Protocol?

– SNMP is one of the UDP-based network protocols.

– Monitoring network-attached devices for various administrative attentions, is the main purpose of SNMP.

– SNMP is one of the protocol suites that are designed by Internet Engineering Task Force.

– It has application layer database schema, protocol, and a group of data objects.

– The basic messages, SET, GET, GET-NEXT, GET-RESPONSE and TRAP are the common messages that communicates between the SNMP manager and the SNMP agent.

20-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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