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.
What are MAC addresses? MAC, or Media Access Control, uniquely identifies a device on the network. It is also called as physical address or Ethernet address. A MAC address is m
What is the benefit of using classless addressing over classfull addressing scheme?
You need to enable both arpa and snap encapsulation on single router interface. How do you do this? Ans)Assign two network numbers, one for every encapsulation type.
Q. Difficulties in Internetwork Communication? - Data arrive at interface f1 of s1 - How does s1 know that they must be sent out from interface f3? - There is no provisio
The most difficult representatives of shared memory programming models are thread libraries present in mainly of the modern operating systems. Some examples for thread libraries ar
Name various types of guided and unguided transmission media. If you are connecting your office computers through a local area network which transmission media would you use? Why?
Disadvantages of Fiber Optics - Installation/maintenance - Unidirectional - Cost
Discuss about the similarity of Intranets to the Internet The ease of use of the end user would be the most noticeable because of the similarity of Intranets to the Internet. S
Question: a) Compare Bluetooth and WIFI based networks over the following factors: Data rate, Range, Application Focus, Battery Power, Frequency Band, Security. b) Differe
Question 1 List 10 common ActiveX controls Question 2 Discuss Network Interface using any OS Question 3 Explain BGP components and its working Question 4 G
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