Word:

Alternating bit protocol

(networking)Alternating bit protocol - (ABP) A simple data link layer protocol that retransmits lost or corrupted messages.

Messages are sent from transmitter A to receiver B. Assume that the channel from A to B is initialised and that there are no messages in transit. Each message contains a data part, a checksum, and a one-bit sequence number, i.e. a value that is 0 or 1.

When A sends a message, it sends it continuously, with the same sequence number, until it receives an acknowledgment (ACK) from B that contains the same sequence number. When that happens, A complements (flips) the sequence number and starts transmitting the next message.

When B receives a message from A, it checks the checksum. If the message is not corrupted B sends back an ACK with the same sequence number. If it is the first message with that sequence number then it is sent for processing. Subsequent messages with the same sequence bit are simply acknowledged. If the message is corrupted B sends back an negative/error acknowledgment (NAK). This is optional, as A will continue transmitting until it receives the correct ACK.

A treats corrupted ACK messages, and NAK messages in the same way. The simplest behaviour is to ignore them all and continue transmitting.
Browse
Alterity
Altern
Altern base
Alternacy
Alternant
Alternanthera
Alternanthera philoxeroides
Alternat
Alternate
Alternate alligation
Alternate angles
Alternate generation
Alternately
Alternateness
Alternatica petitio non est audienda
alternating
-- Alternating bit protocol --
Alternating current
Alternation
Alternation of generation
alternation of generations
Alternative
alternative birth
alternative birthing
alternative energy
alternative medicine
alternative pleading
Alternatively
Alternativeness
Alternator
ALTERNIC
Alternity
Althaea
Definitions Index: # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

About this site and copyright information - Online Dictionary Home - Privacy Policy