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What are the disadvantages of asynchronous counter?
Counter circuits made from cascaded J-K flip-flops where each clock input receives its pulses from the output of the previous flip-flop invariably exhibit a ripple effect, where false output counts are generated between some steps of the count sequence. These types of counter circuits are called asynchronous counters, or ripple counters.
What is asynchronous modem?
Typically, in networking, asynchronous means either that it can both send and receive at random, without needing to 'wait' for synchronization, or in the case of DSL, it means the Upstream and Downstream are not the same, which is typical of any internet connection. IE, Cable at 8mbit download typically has 256 kbit (0.25 mbit) upstream. It can download at 1MB/s but only upload at 32KB/s. (8mbit = 1 mbyte) Some DSL connections, such as SDSL and GDSL, have synchronous transfer rates, meaning they send data as fast as they download it. This is not common.
Why does a static condenser differ from synchronous condenser?
Unlike a static condenser (capacitor bank), the value of reactive power from a synchronous condenser can be continuously adjusted. A synchronous condenser also has other advantages over static condensers such as: - not being affecting by harmonics (some harmonics can even be absorbed by a synch condenser) - producing no switching transients
Why a machine should run with synchronous speed?
A synchronous motor is not self starting.However when it is provided with some prime mover ,which rotates it up to 80% of sync. speed,then it continues to rotate at sync.speed even after prime mover is removed.It happens so because rotor poles are locked with rotating magnetic field and hence the speed is always synchronous.
What is induction motor slip?
The slip measures the percentage by which the actual speed is less than the synchronous speed. AC motors have a synchronous speed of 3000 rpm on a 50 Hz system, or 3600 rpm on 50 Hz. Some motors might have a synchronous speed half or a third of those speeds (or less), because the synchronous speed must be divided by the number of pole-pairs. For a 50 Hz motor running at 2850 rpm the slip is (3000-2850)/3000 or 5%. The slip speed is 2850 rpm.
What is asynchronous transmission?
An Asynchronous Communication is where there is 'variable bit rates' at the send and receive ends, in other words the send and receive clock generators are not synchronized as in a Synchronous Communication. Synchronous communication is direct communication where the communicators are time synchronized. This means that all parties involved in the communication are present at the same time. This includes, but is not limited to, a telephone conversation (not texting), a company board meeting, a chat room event and instant messaging. Asynchronous communication does not require that all parties involved in the communication to be present at the same time. Some examples are e-mail messages, discussion boards, blogging, and text messaging over cell phones. In distance (specifically online) education asynchronous communication is the major (sometimes the only) method of communication. Usually, we use different discussion boards in each class with each having its own purpose.
What is the difference between synchronous communication and asynchronous communication?
Synchronous just means "at the same time," so the difference is basically between immediate forms of communication. Here are some examples:Asynchronous communication:EmailMessage BoardsLettersBlogsVideo or Music recordingsOnline discussion boardsSynchronous communication:Phone callsAudio and Video conferencesIn person concertsInstant messaging / chatIn-person conversations / meetingsClearly the synchronous method is much faster, but the method that is best for a specific communication depends on the circumstances.
What are the differences in synchronous communication and asynchronous communication?
AnswerSynchronous communication is direct communication where the communicators are time synchronized. This means that all parties involved in the communication are present at the same time. This includes, but is not limited to, a telephone conversation (not texting), a company board meeting, a chat room event and instant messaging. Asynchronous communication does not require that all parties involved in the communication to be present at the same time. Some examples are e-mail messages, discussion boards, blogging, and text messaging over cell phones. In distance (specifically online) education asynchronous communication is the major (sometimes the only) method of communication. Usually, we use different discussion boards in each class with each having its own purpose. Although all parties maybe present at the same time, they don't necessarily communicate in a synchronized fashion. Telephone conversations, board room converstions, and chat sessions are asynchronous in nature due to the fact that each participator can interrupt at any given moment which makes them inherently asynchronous.
Distinguish between Synchronous and Asynchronous protocols?
The terms "synchronous" and "asynchronous" refer to the two different styles of exchanging information in a digital system between two ports or devices. In both styles, messages need to be organized in order to ensure that they are properly handled. Synchronous messages typically use some sort of external clock to match data exchange, while asynchronous messages simply move at their own individual rates of speed, relying on established systems of rules to ensure proper routing. All computer systems employ both methods of communication and there are a number of different protocols for each.
What is the difference between uart and usart?
UART is universal asynchronous receiver/transmitter. It is a piece of computer hardware that translates data between parallel and serial forms. Modern ICs that have UART's that can also communicate synchronously are called USARTs (universal synchronous/asynchronous receiver/transmitter).
What are differences between asynchronous counter and synchronous counter?
Synchronous CountersSynchronous counters typically consist of a memory element, which is implemented using flip-flops, and a combinational element, which is traditionally implemented using logic gates. Logic gates are logic circuits with one or more input terminals and one output terminal, in which the output is switched between two voltage levels determined by a combination of input signals. The use of logic gates for combinational logic typically reduces the cost of components for counter circuits to an absolute minimum, so it remains a popular approach.Clock PulseSynchronous counters have an internal clock, whereas asynchronous counters do not. As a result, all the flip-flops in a synchronous counter are driven simultaneously by a single, common clock pulse. In an asynchronous counter, the first flip-flop is driven by a pulse from an external clock and each successive flip-flop is driven by the output of the preceding flip-flop in the sequence. This is the essential difference between synchronous and asynchronous counters.Asynchronous CountersAsynchronous counters, also known as ripple counters, are the simpler type, requiring fewer components and less circuitry than synchronous counters. Asynchronous counters are easier to construct than their synchronous counterparts, but the absence of an internal clock also introduces several major disadvantages. The flip-flops in an asynchronous counter change states at different times, so the delays in changing from one state to another -- known as propagation delays -- add up to create an overall delay. The more flip-flops an asynchronous counter contains, the greater the overall delay.ConsiderationsTypically, asynchronous counters are less useful than synchronous counters in complex, high-frequency systems. Some integrated circuits react faster than others, so if an external event occurs close to a transition between states -- when some, but not all, the integrated circuits have changed state -- it may introduce errors into the counter. Such errors are difficult to predict because of the randomly variable time difference between events. Furthermore, propagation delays can make it difficult to detect, or decode, the output state of an asynchronous counter circuit electronically.
What are some examples of communication devices?
modem
What are the disadvantages of asynchronous counter?
Counter circuits made from cascaded J-K flip-flops where each clock input receives its pulses from the output of the previous flip-flop invariably exhibit a ripple effect, where false output counts are generated between some steps of the count sequence. These types of counter circuits are called asynchronous counters, or ripple counters.
What are some examples of oral communication?
face to face
Why public key criptography requires longer keys than single key cryptography?
The answer is actually in the question. First, you need to understand what happens with public key cryptography (asynchronous). In essence you use public keys to initiate a secure channel, by which to pass a "single" or more properly stated, synchronous key. The operation to encrypt with the large asynchronous key is very expensive (from a computation time perspective), so you only use that to encrypt the synchronous key, then you encrypt the actual data with this synchronous key. The reason that synchronous keys are shorter is because (if you are being secure) the synchronous keys are transfered in a secure manner. For example, either by passing it to someone in person, or over a channel that is secure. An asynchronous key is not transfered via a secure method, it is transfered in the clear. To really understand how this all works, you need to look into a Diffie Hellman key exchange. A public key is really just a really big prime number put through some sort of algorithm. If we use multiplication as an example we can say, you take one huge prime number and multiply it by another huge prime number. This operation is easy to do, but very hard to undo without one of the numbers. The magic of how to get to secret numbers by transferring (in the clear) non secret numbers is what Diffie Hellman key exchange is all about. So I guess the short and sweet answer to your question is: Asynchronous keys are longer then synchronous keys because synchronous keys are only meant to be transfered via a secure channel. Asynchronous keys are transfered via insecure channels and must be longer to get an appropriately sized number to prevent factorization.
What are some examples of communication technology?
cell phone, computer, email,pager
What is meta communication give example?
what are some examples of meta communication?Here are the three types of metacommunicationanticipatory metacommunicationadaptive metacommunicationreflective metacommunication
