ГОСТ Р 53953 — 2010
uninterruptible power supply system (for railway telecommunication equipment) 175
upper level ring primary digital channel (of an operational telecommunication system) 112
up state (of maintenance entity) 227
user 10
user information (data) transmission quality (of railway telecommunication network) 258
user information (data) transmission quality of railway telecommunication system 258
user of railway telecommunication network 10
user of railway telecommunication system 10
user of telecommunication services 11
user terminal of operational satellite communication 162
user terminal of train satellite communication 162
VC concatenation 97
VC-n 96
VC-o-X 97
vehicle-mounted station 148
Virtual Container-r? (of transmission system SDH) 96
voice frequency party line channel 113
voice frequency channel (of railway transportation primary network) 110
warranty servicing (of raihvay telecommunication facilities) 219
wavelength-division fiber-optic transmission system (of railway transportation) 89
wavelength division multiplexer (of railway primary telecommunication network) 126
wavelength division multiplexer (of railway telecommunication transport network) 126
WDM 126
wire transmission system (of railway transportabon) 85
yard intercom subscriber unit 139
(4-wire.’2-wire) interface unit (for operational telecommunication) 140
49