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24 Cards in this Set

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