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24 Cards in this Set
- Front
- Back
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What are the three parts of a message block
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1. header
2. text 3. trailer (or ending) |
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The wire pair that is used to connect individual telephone to a telephone exchange is called
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subscriber loop
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Which channel series is best suited for low-speed, multipoint communications between terminals
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1000
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describe 3000 series circuit
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mostly used for data transmisssion but can be used for voice.
* transmits between 7200-9600bps. |
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The transmission method that requires each transmitted character to be framed by a start and stop bit is
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Asynchronous
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What a the 3 communication channels used to transfer information
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- simplex
- half-duplex - full duplex |
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descibe series 4000
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voice-grade described as a supervoice facility.
series 4002 is used primarily to send telephotographs. |
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What is the primary differecne between a series 2000 and 3000 circuit
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the method of testing 3000 circuits assures better line quality than that of 2000 circuit
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What controlls the routing of messages in a message-switching system
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The message switching center
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describe series 5000
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Broadband. for customers who require bulk communications between locations.
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How is the header in a message identified
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by the SOH(start of header) character and the STX (start of text character)
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What transmission method requires each transmitted character to be framed by a start and stop bit
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asynchronous
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What transmission facility is often used in place of microwave relay stations?
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Satellite relay
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A receiving terminal knows that it has received all the text of a message when
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ETX character is received
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What are the function of a computer at a message-switching center
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1. samples telegraph lines periodically for messages
2. stores messages until they can be relayed 3. processes information contained in the header of a message |
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HOW IS DATA MOVED IN A LINE-SWITCHING NETWORK
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IT IS CONTROLLED BY THE TRANSMIT AND RECEIVED MODEM
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Describe series 1000 circuit
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1000- subvoice, used for transmitting DC binary signals,low speed multipoint cummunications between terminals
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Describe series 2000 circuits
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used for voice transmission, can be used for half-duplex data. supports bandwidths of 300 hz to 3000hz.
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A TELPAK C channel is a grouping of 60 voice-grade channels and is available under which telephone company offering series
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5000
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The switched network can guarantee accurate transmission of data at what maximum bps rate
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4800
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What transmission method is more sophisicated and expensive
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synchronous
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How is Half-duplex different from full duplex
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Half-duplex allows for bidirectional transmission but not simultaneously
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What is simplex
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A communication channel that allows communication of information in one direction only
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The Parallel transmission mode is commonly referred as
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serial by character, parallel by bit
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