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Что (кто) такое van-guard - определение
TELECOMMUNICATIONS DELAY
Guard period; Guard Interval; Guard bits; Guard symbols
van-guard
n.
Advance-guard, first line, van, front rank.
guard's van
![[[British Railways]] "standard" brake van](https://commons.wikimedia.org/wiki/Special:FilePath/BR brake van at Colne Valley Railway 2.jpg?width=200 "[[British Railways]] \"standard\" brake van")
!["toad"]] brake van of the [[Great Western Railway]]](https://commons.wikimedia.org/wiki/Special:FilePath/GWR Toad Brake Van.jpg?width=200 "\"toad\"]] brake van of the [[Great Western Railway]]")
![[[British Rail Mark 1]] coach with passenger compartments (left) and brake / luggage area (right)](https://commons.wikimedia.org/wiki/Special:FilePath/Mark 1 coach 99538 at Bristol Temple Meads 2006-03-01 05.jpg?width=200 "[[British Rail Mark 1]] coach with passenger compartments (left) and brake / luggage area (right)")
![SR]] "Queen Mary" [[bogie]] brake van - most British brake vans had just four wheels and a rigid wheelbase. This one has all three side lamps visible.](https://commons.wikimedia.org/wiki/Special:FilePath/SR Queen Mary 56290.JPG?width=200 "SR]] \"Queen Mary\" [[bogie]] brake van - most British brake vans had just four wheels and a rigid wheelbase. This one has all three side lamps visible.")
RAILWAY VEHICLE
Guard's van; Guards van; Break van; Passenger brake van; Guard’s van; Brake car
(guard's vans)
The guard's van of a train is a small carriage or part of a carriage in which the guard travels. (BRIT)
N-COUNT
guard's van
RAILWAY VEHICLE
Guard's van; Guards van; Break van; Passenger brake van; Guard’s van; Brake car
¦ noun Brit. a carriage or wagon occupied by the guard on a train.
Википедия
Guard interval
In telecommunications, guard intervals are used to ensure that distinct transmissions do not interfere with one another, or otherwise cause overlapping transmissions. These transmissions may belong to different users (as in TDMA) or to the same user (as in OFDM).
The purpose of the guard interval is to introduce immunity to propagation delays, echoes and reflections, to which digital data is normally very sensitive.
