34 Description TB9400/TN9275 Installation and Operation
© Tait International Limited May 2023
Offline Mode
Offline mode allows a maintenance engineer to carry out tasks that can not
be done while the base station is in service - such as activating firmware or
running diagnostic tests.
1.8.3 Intermodule Communications
A system control bus and a subrack interconnect board link the modules in
the subrack and carry alarm and control signaling between the reciter and
the other modules, as shown in Figure 1.7.
Specific configuration settings for dual base stations are described in
“Recommended Configuration Settings” on page 66.
Figure 1.7 Intermodule communication paths
Fan
IC
2
RS-485
RS-485IC
2
FanFan
PA 1
mP
Subrack Interconnect Board
Reciter 1
mP
Front Panel
Fan 3:
PMU
Fan 1:
Reciter 1/
PA 1
Fan 2:
Reciter 2/
PA 2
User
Controls
PMU
mP
I C Current
Source
2
RS-485RS-485 Fan
PA 2
mP
Reciter 2
mP