Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. Determine briefly subscriber loop system. Give some technical specification for subscriber lines.
Ans:
Subscriber Loop System:Each subscriber in a telephone network is connected generally to the nearest switching office by a dedicated pair of wires. Subscriber loop refers to this pair of wires. It is un-widely to run physically independent pairs from each subscriber premises tothe exchange. It is far easier to lay cables comprising a number of pairs of wires for different geographical locations and run individual pairs as needed by subscriber premises.
Commonly four levels of cabling are used as displayed in figure. At the subscriber end, drop wires are taken to a distribution point. Drop wires are the individual pairs which run into the subscriber premises. At distribution point, drop wires are connected to wire pairs in distribution cables. Many distribution cables from nearby geographical locations are terminated on a feeder point where they are linked to branch feeder cables which, in turn, are linked to main feeder cable. Main feeder cables carry a larger number of wire pairs, usually 100-2000, than distribution cables which carry normally10-500 pairs. Feeder cables are terminated on a main distribution frame (MDF) at the exchange. Subscriber cable pairs emanating from exchange are also terminated on the MDF.
Exchange pairs and subscriber pairs are interconnected at the MDF by jumpers. MDF thus provides a flexible interconnection mechanism which is very useful in reallocating cable pairs and subscriber numbers. Technical specifications for subscriber lines include:
1. Diameter of wire
2. D.C. resistance per Km
3. Attenuation per K
Q. Counter-controlled analog to digital converter? Figure shows the block diagram of a counter-controlledA/Dconverter. Resetting the binary counter to zero produces D/A output
Q. Working of Electrically erasable programmable rom EEPROM is used for remote-area applications. The device is provided with special pins which, when activated electrically, a
AC Link Chopper This copper has two stage conversion. First DC is converted into AC by the use of inverter. The magnitude of AC voltage is varied by the transformer and
Q. An antenna with an effective noise temperature of 130 K couples through a waveguide that has a loss of 0.8 dB to a receiver. Find the effective noise temperature presented by th
Revenue Loss Due to Loss of Opportunity to Serve The revenue loss because of "loss of opportunity to serve" is a extremely relevant but less visible aspect of revenue loss. Gu
For Zero Flag JZ ( Jump on Zero) and JNZ ( jump on no zero ) Instruction JZ transfer the execution of the program to the speciffed address if zero flag is set (Z=
where is a zener diode used in a car
Q. Reduce the circuit of Figure to a Thévenin and a Norton equivalent circuit with respect to terminals a-b.
Q. A two-winding system has its inductances given by where k 1 and k 2 are constants. Neglecting the winding resistances, derive an expression for the electric force when
Q. Determine the armature current and torque angle? A 1500-hp, 6600-V, six-pole, 60-Hz, three-phase, wye-connected, synchronous motor, with a synchronous reactance of 36 , neg
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd