A-005-08: Codes and protocols, Baudot, ASCII, parity, CRC, X.25, ISO layers
A-005-08-01:
What digital code consists of elements having unequal length?
Morse code
AX.25
Baudot
ASCII
A-005-08-02:
The International Organization for Standardization has developed a seven-level reference model for a packet-radio communications structure. What level is responsible for the actual transmission of data and handshaking signals?
The physical layer
The link layer
The network layer
The transport layer
A-005-08-03:
The International Organization for Standardization has developed a seven-layer reference model for a packet-radio communications structure. What level arranges the bits into frames and controls data flow?
The link layer
The synchronization layer
The communications layer
The transport layer
A-005-08-04:
What is one advantage of using ASCII rather than Baudot code?
It is possible to transmit upper and lower case text
ASCII includes built-in error correction
ASCII characters contain fewer information bits
The larger character set allows store-and-forward
A-005-08-05:
What type of error control system is used in AMTOR ARQ (Mode A)?
The receiving station automatically requests repeats when needed
The receiving station checks the frame check sequence (FCS) against the transmitted FCS
Each character is sent twice
Mode A AMTOR does not include an error control system
A-005-08-06:
What error-correction system is used in AMTOR FEC (Mode B)?
Each character is sent twice
Mode B AMTOR does not include an error-correction system
The receiving station automatically requests repeats when needed
The receiving station checks the frame check sequence (FCS) against the transmitted FCS
A-005-08-07:
What is the primary advantage of AMTOR over Baudot RTTY?
AMTOR includes an error detection system
Surplus teletype machines that use AMTOR are readily available
Photographs may be transmitted using AMTOR
AMTOR characters contain fewer information bits than Baudot characters
A-005-08-08:
We have all used the term ASCII when using computers or teletypewriting equipment. What do those initials represent?
American Standard Code for Information Interchange
A Standard Code for Information Interchange
North American System Compatible with International Interchange
Amalgamated System Code for Information Interchange
A-005-08-09:
The designator AX.25 is associated with which amateur radio mode?
packet
RTTY
ASCII
spread spectrum speech
A-005-08-10:
How many information bits are included in the Baudot code?
5
7
8
6
A-005-08-11:
How many information bits are included in the ASCII code?
8
7
6
5
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