Description : A two stage non-blocking network requires twice the number of switching elements as the single stage non-blocking network. (A) TRUE (B) FALSE
Last Answer : Ans: (A)
Description : In a time division space switch the size of the control memory is N and its Width: (A)Log10M (B) LogeM (C) LogNM (D) Log2M Where N are the outlets and M the number of data samples
Last Answer : Ans: (It should be 2 log2[N]
Description : The Signalling connection control part (SCCP) and message transfer part (MTP) together are referred to as (A) Signal Switching Points (SSPs) (B) Signal Transfer Points (STPs) (C) Signal Control Points (SCPs) (D) Network service part (NSP)
Last Answer : (D) Network service part (NSP)
Description : Trunks are the lines that run between (A) Subscribers and exchange (B) Switching system and power plant (C) Local area network (D) Switching stations
Last Answer : (D) Switching stations
Description : In step by step switching line finders are connected to the (A) Calling subscriber. (B) Switching network. (C) Called subscriber. (D) Between exchanges.
Last Answer : (A) Calling subscriber.
Description : Trunks are the lines that run between (A) subscribers and exchange (B) switching system and power plant (C) Local Area Network (D) switching systems
Last Answer : (B) switching system and power plant
Description : The final selector is connected to the (A) calling subscriber. (B) switching network. (C) called subscriber. (D) line finder.
Last Answer : (C) called subscriber
Description : Trunks are the lines that run between (A) Subscribers and exchange (B) switching system and power plant (C) Local area network. (D) Switching stations.
Last Answer : (D) Switching stations.
Description : Traffic Handling Capacity is given by (A) Switching capacity ×Theoretical maximum load (B) Switching capacity / Theoretical maximum load (C) Theoretical maximum load / Switching capacity (D) Theoretical maximum load + Switching capacity
Last Answer : (B) Switching capacity / Theoretical maximum load
Description : Traffic Capacity is given by (A) Switching capacity × Theoretical maximum load (B) Switching capacity / Theoretical maximum load (C) Theoretical maximum load / switching capacity (D) Theoretical maximum load × Switching capacity
Last Answer : (A) Switching capacity × Theoretical maximum load
Description : In a single stage network: (A) There is no redundancy (B) There is redundancy (C) Alternative cross points are available (D) Alternative paths are available
Last Answer : (B) There is redundancy
Description : Through two block diagrams explain the difference between Space division and time division switching.
Last Answer : Space and Time Switching: Space Switches: Connections can be made between incoming and outgoing PCM highways by means of a cross point matrix of the form shown in Fig. However, different channels of ... of the speech store, whose contents are read out and sent over the outgoing highway.
Description : What are the advantages and disadvantages of packet switching over circuit switching?
Last Answer : The comparison of packet switching and circuit switching showing advantages and disadvantages of packet switching over circuit switching is given below:
Description : Explain the CCITT hierarchical structure of switching and routing using block schematic.
Last Answer : Hierarchical network are capable of handing heavy traffic where required, and at the same time use minimal number of trunk groups. A 5-level switching hierarchy is recommended by CCITT as ... A strictly hierarchical network suffers from serious drawback i.e. its poor fault tolerance future.
Description : Show how finite state machine model helps in designing a switching system and give a typical example.
Last Answer : Switching system basically belongs to the class of finite state machines (FSM) which are asynchronous in nature and follows a sequential logic for their operation. They can be modeled by ... circuits and memory elements. Clocked synchronous operation shown in Fig. overcome such problems.
Description : Compare electromechanical switching system with electronic switching system.
Last Answer : Ans:
Description : Explain the basic architecture of digital switching systems. Explain in detail companding.
Last Answer : A simple N X N time division space switch is shown in Fig. The switch can be represented in an equivalence form as a two-stage network with N X 1 and 1 X N switching matrices for the first and ... = Parameter used to define the amount of compression Vout = Compressed output voltage.
Description : What is time multiplexed space switching? With a neat diagram explain its operation.
Last Answer : Time division switches where an inlet or an outlet corresponded to a single subscriber line with one speech sample appearing every 125 µs on the line. Such switches are used in local exchanges. We now ... / Mt , Where t is the switching time including memory access time per inlet-outlet pair.
Description : What is meant by common control? Explain all the categories that are served by Common Control switching.
Last Answer : In some switching systems, the control subsystem may be an integral part of the switching network itself. Such system is known as direct control switching systems. Those systems in which the control ... may be carried out at the level of the common control unit or the switching network.
Description : How speech is transmitted in a digital switching environment using PCM/TDM?
Last Answer : A digital carrier system is a communications system that uses digital pulses rather than analogue signals to encode information. Fig shows the block diagram for a digital carrier system. This digital ... to maintain frame and sample synchronization between the TDM transmitter and receiver.
Description : Name the switching schemes used in a digital exchange. How call processing takes place?
Last Answer : The different switching systems used are: 1. Strowger Switching System 2. Cross bar Switching. 3. Electronic Switching System Basic Call Procedure: Fig. Shows a simplification ... machine detects an open circuit on that loop and then drops the connections through the switch.
Description : What is time division switching? With the help of block diagram explain basic time division time switching method.
Last Answer : Time Division Switching: A switching element can be shared by number of simultaneously active speech circuits. This is the principle of time division switching. Obviously, with the way the switching elements are shared in time ... to MDR. This is done by the in-gate and out-gate units.
Description : What is store program control (SPC)? Give the organization of centralized SPC. Discuss the advantages of SPC automation in telephone switching.
Last Answer : In stored program control systems, a program or set of instructions to the computer is stored in its memory and the instructions are executed automatically one by one by the processor. Carrying out ... of services can be provided to customers. (v) Increase level of automotive in switching
Description : With neat diagrams explain the configuration of a step-by-step switching system.
Last Answer : The schematic diagram for such an exchange is given in Fig. Each subscriber is connected to a single rotary pre-selector switch at the exchange, the outputs from this switch being ... two further digits, connection is established, providing the called subscriber's to answer his telephone.
Description : Packet switching is used for (A) Credit card verification (B) Automated Teller Machine (C) The internet and the World Wide Web (D) All of the above
Last Answer : (D) All of the above
Description : Example of circuit switching and S&F (Stored and Forward) switching is (A) Telephone and Post of Telegraph (B) Video Signal Post or Telegraph (C) Digital Signal Post or Telegraph (D) None of above
Last Answer : (A) Telephone and Post of Telegraph
Description : SPC stands (A) Standard Protocol Control (B) Stored Program Control (C) Signaling and switching Centre (D) Signaling Process Center
Last Answer : (B) Stored Program Control
Description : In a time multiplexed space switching system, one speech sample appears every (A) 125 micro sec (B) 20 msec (C) 125 msec (D) 1 sec
Last Answer : (A) 125 micro sec
Description : In Induction motor Slip frequency of rotor current, when rotor speed is Nr. Then rotor producing slip field rotates with respect to stator is a) Slip frequency b) Nr c) Ns d) None
Last Answer : Ans: Ns
Description : Five persons M, N, O, P and Q request a bank for safety lockers. There are only 6 lockers available which are numbered from 52 to 57. The conditions are as follows: I. M's locker number is 2 less than O's lockers ... could be a) 52 or 53 only b) 53 or 54 only c) 54 or 55 only d) 53 or 55 only
Last Answer : c) 54 or 55 only
Description : Five persons M, N, O, P and Q request a bank for safety lockers. There are only 6 lockers available which are numbered from 52 to 57. The conditions are as follows: I. M's locker number is 2 less ... , then which locker number is not allocated? a) locker 52 b) locker 53 c) locker 54 d)locker 56
Last Answer : a) locker 52
Description : In a LAN network every system is identified by (A) Name (B) MAC address (C) IP Address (D) Serial number given by manufacturer
Last Answer : (C) IP Address
Description : If 12 (M’s capital) = 18 (N’s capital) = 30 (O’s capital) then out of a profit of Rs.13950, How much amount O will receive? A) Rs.2700 B) Rs.2600 C) Rs.2500 D) Rs.2400
Last Answer : Answer: A) Let 12 M = 18N = 30 O = y M = y/12, N = y/18 O = y/30 Therefore M : N: O = y/12 : y/18 :y/30 = 15 : 10 : 6 Hence O’s share = Rs (13950 * 6/31) = Rs.2700
Description : L, M and N started a business in which L invested Rs.15000/- for 2year, M invested Rs 25000/- for 3 years, N invested Rs.35000/- for 4 years. At the end of the profit received by them is Rs.9800/-. What is N’s share?. A) 5600 B) 5000 C) 5500 D) 4500
Last Answer : Answer: A) L = Rs.15000/- per 2 years M= Rs.25000/- per 3 years N = Rs.35000/- per 4 years = 15000 2 : 25000 3 : 35000 4 =30000:75000:140000=30:75:140 =6:15:28 Total = 49 parts -----> Rs. ... ) = 1 part ------> Rs.200/- Then, N's share is = 28 parts = Rs.200 28 parts = Rs.5600
Description : Discuss different Routing plan adopted in a Telephone network.
Last Answer : Hierarchical networks are capable of handing heavy traffic where required, and at the same time use minimal number of trunk groups. Three methods are used for deciding on the route for a ... selection methods can be implemented. Computer based routing is a standard feature in data networks.
Description : Find the total number of link L having five entities? Explain differences between folded and non-folded network.
Last Answer : Folded network: When all the inlets/outlets are connected to the subscriber lines, the logical connection appears as shown in Fig. In this case, the output lines are folded back to the input ... non-folded network to be non-blocking, the network should support N simultaneous switching paths.
Description : What are the major systems of a telecommunication network? Discuss in detail the subscriber loop systems.
Last Answer : The major systems of any telecommunication network may consist of the following major systems: 1. Subscriber end instruments or equipments 2. Subscriber loop systems 3. Switching ... exchange. The subscriber cable pairs emanating from the exchange are also terminated on the MDF.
Description : An important terminal that is required between DTE and PSTN is (A) Server (B) MODEM (C) Relay (D) Network card
Last Answer : (B) MODEM
Description : A distributed network configuration in which all data/information pass through a central computer is (A) Bus network (B) Star network (C) Ring network (D) Point to point network
Last Answer : (B) Star network
Description : Signalling transfer point (STP) exist in (A) Strowger exchange (B) SS7 (C) Local area network (D) PABX
Last Answer : (B) SS7
Description : The function of ARQ in a network protocol is to: (A) Auto request (B) Acknowledge (C) Address request (D) Abort
Last Answer : (A) Auto request
Description : Network Layer is used for (A) Breaking up the data in frames for transmission (B) Deal with Error correction (C) Automatic Recovery of Procedure (D) Physical Architecture
Last Answer : (D) Physical Architecture
Description : Network with point-to-point link is known as (A) Fully Connected Network (B) Half Connected Network (C) Duplex Connected Network (D) None of these
Last Answer : (A) Fully Connected Network
Description : A/An ______network is typically a company network that connects multiple company locations into a single network. (A) local area (B) enterprise (C) campus wide (D) protocol.
Last Answer : (B) enterprise
Description : The ________is a circuit-switched network, while the ______is a packet-switched network. (A) Telephone, ATM (B) SONET and FDDI (C) Satellite, Telephone (D) FDDI and SONET
Last Answer : (A) Telephone, ATM
Description : The number of point to point links required in a fully connected network for 50 entities is (A) 1250 (B) 1225 (C) 2500 (D) 50
Last Answer : Ans: (C)
Description : A wire of resistance R is cut into ‘n’ equal parts. These parts are then connected in parallel. The equivalent resistance of the combination will be – (1) nR (2) R/n (3) n/R (4) R/n²
Last Answer : (4) R/n² Explanation: Since R is directly proportional to length of the wire, when wire is cut into equal parts, then Resistance of each part = R/n
Description : The larger the Grade Of Service, the worse is the service given (A) TRUE (B) FALSE
Description : Let the page fault service time be 10 millisecond(ms) in a computer with average memory access time being 20 nanosecond(ns). If one page fault is generated for every 106 memory accesses, what is the effective access time for memory? (A) 21 ns (B) 23 ns (C) 30 ns (D) 35 ns
Last Answer : (C) 30 ns
Description : Pick up the correct statement from the following: A. Inlets are provided on the road surface at the lowest point for draining rain water B. Inlets are generally provided at an interval of ... along straight roads C. Inlets having horizontal openings, are called horizontal inlets D. All the above
Last Answer : ANS: D