H
ELECTRICITY
H
ELECTRICITY
H04
ELECTRIC COMMUNICATION TECHNIQUE
H04
ELECTRIC COMMUNICATION TECHNIQUE
H04L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
H04L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
1/00
Arrangements for detecting or preventing errors in the information received
1/00
Arrangements for detecting or preventing errors in the information received
H04L1/12
by using return channel
H04L1/12
by using return channel
H04L1/16
in which the return channel carries supervisory signals, e.g. repetition request signals
H04L1/16
in which the return channel carries supervisory signals, e.g. repetition request signals
H04L1/18
Automatic repetition systems, e.g. Van Duuren systems
H04L1/18
Automatic repetition systems, e.g. Van Duuren systems
H04L1/1867
Arrangements specially adapted for the transmitter end
H04L1/1867
Arrangements specially adapted for the transmitter end
H04L1/1893
Physical mapping arrangements
H04L1/1893
Physical mapping arrangements