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define congestion and grade of service congestion this is uneconomic to give sufficient equipment to carry all the traffic which could possibly be
a three stage switching structure supports 100 inlets and 400 outlets find the number of cross points and the number of primary and secondary
an amplifier has an input resistance of 600 ohms and a resistive load of 75 ohms when it has an rms input voltage of 100 mv the rms output current is
a group of 20 servers carry traffic of 10 erlangs if the average duration of a call is three minutes calculate the number of calls put through by a
an exchange uses a -40 v battery to drive subscriber lines a resistance of 250 ohms is placed in series with the battery to protect it from short
calculate the number of trunks that can be supported on a time multiplexed space switch given that 32 channels are multiplexed in each stream while
in a 10000 line exchange 0000 to 2999 is allotted to x group of subscribers out of which 40 are active during busy hour the remaining numbers are
discuss grade of service during busy hour 1500 calls were offered to a group of trunks and 8 calls were lost the average call duration was 120
a three stage network is designed with the following parametersmn512 p q 16 and alpha 065 calculate the blocking probability of the network if s16
in a national transmission system the characteristic impedances of the 4-wire circuit and the 2-wire circuit are 1200 and 1000 respectively the
a subscriber makes three phone calls of 3 minutes 4 minutes and 2 minutes duration in a one hour period calculate the subscriber traffic in erlangs
sky wave communication is prone to fading it is true or falseansit is true that sky wave communication is prone to
a certain amount of side tone is essential in telephone communicationansit is true that a specific amount of side tone is necessary in telephone
a two stage non-blocking network requires twice the number of switching elements as the single stage non-blocking network it is true or falseansit is
the larger the grade of service the worse is the service given it is true or falseansit is true that larger the grade of service the worse service is
the signalling connection control part sccp and message transfer part mtp together are referred to asa signal switching points ssps b signal
analog signals can be by combining them with a carrier frequencya
packet switching is used fora credit card verificationb automated teller machinec the internet and the world wide webd all of the
trunks are the lines that run betweena subscribers and exchangeb switching system and power plantc local area networkd switching
traffic intensity can be measured ina traffic intensity can be measured ina
traffic handling capacity is given bya switching capacity times theoretical maximum load b switching capacity theoretical maximum load c
an important terminal that is required between dte and pstn isa
a distributed network configuration in which all datainformation pass through a central computer isa bus
computer to computer communication isa computer to computer communication isa
arq is transmitted in the event ofa loss of