X.3
Encyclopedia
X.3 is an ITU-T
standard indicating what functions are to be performed by a Packet Assembler/Disassembler
(PAD) when connecting character-mode data terminal equipment
(DTE), such as a computer terminal
, to a packet switched network
such as an X.25
network, and specifying the parameters that control this operation.
The following is list of X.3 parameters associated with a PAD:
ITU-T
The ITU Telecommunication Standardization Sector is one of the three sectors of the International Telecommunication Union ; it coordinates standards for telecommunications....
standard indicating what functions are to be performed by a Packet Assembler/Disassembler
Packet Assembler/Disassembler
A packet assembler/disassembler, abbreviated PAD is a communications device which provides multiple asynchronous terminal connectivity to an X.25 network or host computer. It collects data from a group of terminals and places the data into X.25 packets...
(PAD) when connecting character-mode data terminal equipment
Data terminal equipment
Data Terminal Equipment is an end instrument that converts user information into signals or reconverts received signals. These can also be called tail circuits. A DTE device communicates with the data circuit-terminating equipment...
(DTE), such as a computer terminal
Computer terminal
A computer terminal is an electronic or electromechanical hardware device that is used for entering data into, and displaying data from, a computer or a computing system...
, to a packet switched network
Packet switched network
A packet-switched network is a digital communications network that groups all transmitted data, irrespective of content, type, or structure into suitably sized blocks, called packets...
such as an X.25
X.25
X.25 is an ITU-T standard protocol suite for packet switched wide area network communication. An X.25 WAN consists of packet-switching exchange nodes as the networking hardware, and leased lines, Plain old telephone service connections or ISDN connections as physical links...
network, and specifying the parameters that control this operation.
The following is list of X.3 parameters associated with a PAD:
- 1 PAD recall using a character
- 2 Echo
- 3 Selection of data forwarding character
- 4 Selection of idle timer delay
- 5 Ancillary device control
- 6 Control of PAD service signals
- 7 Operation on receipt of break signal
- 8 Discard output
- 9 Padding after carriage return
- 10 Line folding
- 11 DTE speed
- 12 Flow control of the PAD
- 13 Linefeed insertion after carriage return
- 14 Padding after linefeed
- 15 Editing
- 16 Character delete
- 17 Line delete
- 18 Line display
- 19 Editing PAD service signals
- 20 Echo mask
- 21 Parity treatment
- 22 Page wait