M&MA

Multiplexing And Multiple Access : Digital Communications Difference between Multiplexing and Multiple Access: Sr.No. Multiplexing Multiple Access 1 “In telecommunications and  computer networks, multiplexing is a process where multiple analog  message signals or digital data  streams are combined into one   signal over a shared medium.” “In telecommunications and computer networks, a channel access method or multiple access  method allows several terminals connected to the same multipoint physical medium to transmit over it and to share its capacity.” 2 The multiplexed signal is transmitted  over a communication channel,  which may be a physical transmission medium. A channel-access scheme is  based on a multiplex method  that allows several data streams  or signals to share the...

Difference in between TDM and FDM: This page on FDM versus TDM describes  difference between FDM and TDM multiplexing . FDM is the short form of frequency division multiplexing and TDM is the short form of time division multiplexing. In FDM each signal is modulated onto different unique RF carrier frequency and all carrier frequencies are separated significantly so that bandwidth of the signals do not overlap in frequency domain. Figure: Difference in between TDM and FDM

Comparison between AC and DC servo systems : Sr. No. AC servo systems DC servo systems 1.                       Efficiency is low Efficiency is high 2.                       Low power output High power output 3.                       It requires less maintenance It requires frequent maintenance 4.                       Less stability problems More stability problems. 5.                    ...

Comparison of stepper motor with DC servo motor : sr . No. Stepper motors DC servo motor 1. Control winding is not present. Control wingding              is present 2. Stepping              rate        is governed by frequency of switching and not by supply voltage. Does not rotate in steps. 3. Number of steps can be precisely controlled by controlling the number of pulses. DC servo motor gives continuous rotation. 4. Brushes are absent. Brushes are present 5. Maintenance is low High  maintenance 6. Due        to            load/no         ...

Comparison between armature controlled and field controlled DC servo motor : Field controlled DC servomotor Armature controlled DC servomotor 1.                         Field is excited by control voltage Armature is excited by control voltage 2.                        Armature            current kept constant Field      current kept constant 3.                        Required             low        power amplifi...

Comparison between IPv4 options and IPv6 extension headers: Comparison               1 . The header length field is eliminated in IPv6 because the length of the header is fixed in this version. 2.The service type field is eliminated in IPv6. The priority and flow label fields together take over the function of the service type field. 3.The total length field is eliminated in IPv6 and replaced by the payload length field. 4.The identification, flag, and offset fields are eliminated from the base header in IPv6. They are included in the fragmentation extension header. 5.The TTL field is called hop limit in IPv6. 6.The protocol field is replaced by the next header field. 7.The header checksum is eliminated because the checksum is provided by upper-layer protocols; it is therefore not needed at this level. 8.The option field...

Socket Programming: "An application programming interface (ATI) use for interprocess communication (IPC) . A well defined method of connecting two process locally or across a network it is protocol and language interdependent and often referred as Berkeley socket or BSD Socket."