Fill in the Blanks


1		Data compression circuits are used in some modems because that will allow the message to be transmitted more .


2		In telephone lines, the bandwidth varies with length and higher frequencies are greatly attenuated.


3		modems provide significantly higher data rates than can be achieved over the standard telephone system.


4		Channel encoding methods fall into two separate categories, error codes and error correction codes.


5		One of the most widely used systems of error is known as parity, in which each character transmitted contains one additional bit.


6		The cyclical redundancy check is a mathematical technique used in data transmission that effectively catches 99.9 percent or more of transmission errors.


7		The longitudinal redundancy check is the process of logically , by exclusive-ORing, all the characters in a specific block of transmitted data.


8		The Reed Solomon code is a widely used forward error code that permits multiple errors to be detected and corrected.


9		are rules and procedures used to ensure compatibility between the sender and receiver of serial digital data regardless of the hardware and software being used.


10		Kermit is a very reliable because it requires that every packet which is sent be acknowledged by the receiver as read correctly.


11		The ability of one hardware-software configuration to communicate with another, different system is known as .


12		The primary benefit of the standard is that if it is incorporated into data communication equipment and software, compatibility between systems and equipment is more likely to be achieved.


13		Data transfers in communication systems are made serially.


14		In transmission each data word is accompanied by start and stop bits that indicate the beginning and ending of the word.


15		One bit time for the code is called a chip.

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