User's Manual

R60 Station
R60 User Manual
Document Number
Version
Date
7000 120-019
A1
2022-08-10
Page 66 (98)
6.13 Configure > Hot standby
Settings in this category are used to configure two R60 units used as a redundant pair
in a hot-standby configuration. Make sure that the R60 units have been connected
together with a hot-standby cable (see Ref [1]) before setting the parameters.
When two R60 Station units are used in a redundant configuration only the primary (A)
unit is used for transmissions, while the hot standby (secondary) unit (B) monitors the
integrity of the primary unit.
Status infor-
mation link
(RS-422)
Ethernet
R60 Aunit
R60 Bunit
Figure 6-2: R60 in a redundant pair configuration
In case of a detected failure in the primary base station unit, the spare unit will
immediately take on the role of becoming the primary base station without any
degradation of the AIS/VDES system. The problems at the site can then be addressed
without immediate actions and without discontinuity of the AIS/VDES service.
To further improve the monitoring of the primary unit it is possible to let the spare unit
check the integrity of on-air messages transmitted from the primary unit. This feature
is enabled with the “VHF Transmission Monitoring” parameter, see Table 6-11 below.
When enabled the standby base station will receive and check messages sent by the
primary R60 and will also detect problems with transmission content or poor
modulation. Thus, the hot-standby redundant configuration will not only offer
redundancy to the system but also increased integrity.
In the configuration the two R60 stations are separated by means of the letters ‘A’ or
‘B’. For the configuration to be meaningful one base station must be configured as the
‘A’-unit and one as the ‘B’-unit. The letters ‘A’ and ‘B’ shall not be confused with which