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!
Asynchronous or Statistical Time Division Multiplexing
As we have seen synchronous TDM does not guarantee that the full capacity of a link in sued. In fact it is more likely that only a portion of the time slots are in use at a given instant. Because the time slots are reassigned and fixed whenever a connected device is not transmitting, the corresponding slot is empty and that much capacity of the path is wasted. For example imagine that we have multiplexed the output of 20 identical computer onto a single line. Suing synchronous TDM the speed of that line must be at least 20 times the speed of each input line. But what if only 10 computers are in use at a time ? half of the capacity of the line is wasted.
Statistical time division multiplexing is designed to avoid this type of waste. As with the term synchronous. The term asynchronous means some things different in multiplexing that it means in other areas of data communications. Here it flexible or not fixed.
Like synchronous TDM asynchronous TDM allows a number of lower speed input lines to be multiplexed to a single higher speed line. Unlike synchronous TDM however in asynchronous TDM the total speed of the input can be greater than the capacity of the path. In a synchronous systems if we have in input lines. The frame contains a fixed number of a least m time slots. In an asynchronous systems. If we have n input line the frame contains no more than m slots with m less than n. In this way asynchronous TDM supports the same number of input lines as synchronous TDM with a lower capacity link or given the same link. Asynchronous TDM can support more devices than synchronous TDM.
figure Asynchronous TDM
The number of time slots in an asynchronous TDM fame is based on a statistical analysis of the number of input lines that are likely to be transmitting at any given time. Rather than being reassigned each slot is available to any of the attached input lines that has data to seen. The multiplexer scans the input lines accept portions of data until a frame is felled and then sends the frame across the link. If there are not enough data to fill all the slot s in a frame the frame a transmitted only partially filled thus full link capacity may not be used 100 percent of the time. But the ability to allocate time slots dynamically coupled with the lower ration of the slots to input greatly reduces the likelihood and degree of waste.
Can you define how L2F data tunneling process works?
Name the layer responsible for putting 1s and 0s into a logical group? Ans) Frames are broken down into 1s and 0s and placed onto the physical medium by the Data Lin layer.
Q. What is Source Routing? Source Routing - Sender of packet defines bridges and routes that packet should take - Complete path of bridge IDs and destination address i
What is virtual channel? Virtual channel is normally a connection from one source to one destination, although multicast connections are also allowed. The other name for virtua
Consider figure. Assume a new flow E is added that takes a path from R1 to R2 to R6. How does the max-min bandwidth allocation change for the 5 flows?
Define Decoder? A device or program that translates encoded data into its original format (e.g. it decodes the data). The term is often used in reference to MPEG-2 video and so
BRDGING BETWEEN BUILDINGS: If two buildings are placed far from each other, a bridge, a pair of fiber modems and an optical fiber may be used to locate two LANs as given in t
Question: (a) The diagram below shows a configuration of Internet routers (A-F) which achieve dynamic routing through the use of a Distance Vector routing algorithm. The metr
RIP It is Broadcast There is no authentication It Support FLSM RIPV2 It is Multicast There is Authentication It Support VLSM
What is the method of redistribution?
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