Site diversity switching between two transmitting stations

Overview

• Two transmitting stations, e.g. for radio uplink
• On every location one playout center for radio station is to be found
• Both sites are connected with a terrestrial backup line and an IP network
• Each site can control the M&C Systems on both locations (site-a and site-b)

Local redundancy switching

• Software based 1:1 protection switching for transmitting chains
• Transmitting chains consist of one primary modem and encoder and a spare modem and encoder
• The position of the Protection Switch depends on the status of the modems and encoders
• But switching the modems on or off is also depending on the situation of the station (status of the Site-Switch)
• Chain 1 (MOD-1/1R, ENC-1/1R) is dedicated to radio station 1 and Chain 2 to radio station 2 (MOD-2/2R, ENC-2/2R) on both sites.

Site switching

• Implements the site switching in case of a transmit failure of one station
• Each M&C System monitors two sets of equipment:
  • Primary equipment : two feed back receivers (which receive the transmitted signal of the station)
  • Spare equipment : transceivers, modems and encoders in the transmitting chain for the other radio station
• Switching rules:
  • A station is only selected as spare (transmitting from the spare station) if no fault is detected in this station.
  • A site-switch will be performed if some of the primary equipment of a station fails.
  • If the primary equipment fails, all radio channels will be transmitted from the spare station.