Douglas Harper's Etymology Dictionary
1788, from re- + transmission.
Wiktionary
n. The transmission of something again, especially over a different medium or at a different time
Wikipedia
Retransmission might refer to:
- Retransmission (data networks), the resending of packets which have been damaged or lost
- Replication of a signal at a repeater
- re-broadcast through a rebroadcaster or broadcast translator or booster, or relay station
- Retransmission consent, permission for a cable or satellite company to carry a TV station
Retransmission, essentially identical with Automatic repeat request (ARQ), is the resending of packets which have been either damaged or lost. Retransmission is one of the basic mechanisms used by protocols operating over a packet switched computer network to provide reliable communication (such as that provided by a reliable byte stream, for example TCP).
Such networks are usually 'unreliable', meaning they offer no guarantees that they will not delay, damage, or lose packets, or deliver them out of order. Protocols which provide reliable communication over such networks use a combination of acknowledgments (i.e. an explicit receipt from the destination of the data), retransmission of missing or damaged packets (usually initiated by a time-out), and checksums to provide that reliability.
Usage examples of "retransmission".
He accepted the message and then ordered the attached file copied for retransmission and forwarding.
The revelation explained the havoc resulting from his retransmission of the bell-tones.
I will turn the retransmission command over to you, and ask you to risk suicide by broadcasting yourself out of my communication buffer and back to your embassy.
So, if a staff member wants to look at the rest of the fax, he can call back and request a retransmission on a different line.
The use of seven satellites was also a matter of redundancy, since signal transmission and retransmission was automatic.