Maintenance Guide Part 1

NeTIS MAINTENANCE GUIDE – Version 1.1 13/139

The transmission command, lower power and TOS indicators for the UCM board are

off. Only the ALC indicator flashes

Verification of the state of the different modules and files - if a problem is detected the

remaining operations may be halted.

phase:

The CPUBDT board operates immediately and supplies all the clock signals the

system needs; the 8 test signals (8 KHz; 64 KHz; HT; ...) that are selectable using the

(blue) switch are available on the BNC connector of the BDT module.

The INT indicator for the module flashes

The ACT indicator on the CPUBDT board starts flashing which means that the

programme is running

The EF/ indicator on the UCM board lights (the CPUBDT loads data into the module)

and then the ALC and COR indicators light alternately

The MCCH indicator on the CPUBDT board lights if the BS manages the MCCH

channel

The PLL and CTX indicators light and the ALC and COR indicators turn off => the

BS is transmitting

The programme itself runs

The base station can be in one of the three following situations:

The base station has a correct link with the switch: the switch then uploads

the base station configuration and the base station transmits.

The link with the switch is not established (or the switch is stopped) and the

base station is not programmed to switch to degraded mode: in this case the

base station remains on standby

The link with the switch is not established but the base station is

programmed to switch to degraded mode: in this case the base station

behaves as an automatic TRA-2M relay and transmits.

It is important to note that TETRA mobiles synchronise on the signal received from the

relay transmitter or the base station and that they immediately cease all transmissions if the

signal is not correct – it is therefore essential, when faced with a 'dumb' mobile, to start by

checking the station transmission before checking anything on the mobile itself.