2N BRI Lite/Enterprise v1.8 - Manual (Page 125)

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UCMD Protocol used for gateway firmware upgrade.
UDP (User Datagram Protocol) Transport layer protocol with non–guaranteed
packet delivery.
UMTS (Universal Mobile Telecommunication System) 3G system of the mobile
phone standard, successor to GSM.
UPS (Uninterruptible Power Supply) Source of continuous power supply.
USSD (Unstructured Supplementary Service Data) Data transmission standard
using GSM signalling channels.