ETELM 9, avenue des Deux Lacs P.A de Villejust 91971 Courtaboeuf – cedex Tel : +33.1.69.31.22.84 Fax : +33.1.69.31.22.61 Web site : www.etelm.fr RC : Evry 320 565 443 NeTIS MAINTENANCE ASSISTANCE GUIDE Version Date Modifications Sign. 1.0 1.1 20/05/11 25/04/13 CREATION Add 2.6.7 LM/PM PM/LM NeTIS MAINTENANCE GUIDE – Version 1.
1. PRESENTATION OF A STANDARD TETRA NETWORK ................................................................. 5 2. NETIS -B ...................................................................................................................................................... 6 2.1 PRESENTATION OF THE BASE STATION ....................................................................................................... 6 2.2 DIFFERENT VERSIONS ..................................................................
4.7.1 4.7.2 5. Signalling and phone out of order ................................................................................................. 47 Phone out of order ........................................................................................................................ 48 NETIS-B & NETIS-N SOFTWARE ........................................................................................................ 50 5.1 NETIS-B ......................................................................
9.8.5 10. Diagnosing an authentication problem on a NeTIS-B ................................................................ 123 PABX GATEWAY .................................................................................................................................. 125 10.1 INTRODUCTION ................................................................................................................................. 125 10.2 EQUIPMENT..................................................................
1. PRESENTATION OF A STANDARD TETRA NETWORK System composition A system is composed of: One or more NeTIS-Ns and one or more sites, each one composed of one or more base BS stations (NeTIS-B).
2. NETIS -B 2.1 Presentation of the base station NeTIS-B is a duplex TETRA transmitter receiver connected to the switch using an IP or G703 or V11 link or it can operate autonomously (TETRAG). It manages a TETRA carrier which includes a signal channel and three phone channels.
console d'administration SW SW BS ISI ISI V24 PSTN T2 64Kb/s SW SW 2Mb/s BS BS 2Mb/s IP ISI 2Mb/s 64Kb/s T2 PABX BS SW SW Dispatchings NeTIS MAINTENANCE GUIDE – Version 1.
2.2 Different versions 2.2.1 NETIS BOX VERSION 2 handled box NeTIS-B25 base station Locations for accessories (duplexer, hub …) NeTIS MAINTENANCE GUIDE – Version 1.
2.2.1.1 NeTIS-Box front view 2.2.2 RACKABLE VERSIONS 2.2.2.1 NeTIS B-25 NeTIS MAINTENANCE GUIDE – Version 1.
2.2.2.2 NeTIS B25-C 2.2.2.3 NeTIS-B25-D NeTIS MAINTENANCE GUIDE – Version 1.
2.3 Rear face 2.3.1 NETIS-B25 2.3.2 NETIS –B25C NeTIS MAINTENANCE GUIDE – Version 1.
2.3.3 NETIS-B25D 2.4 Normal NeTIS-B operation When powered on, the NeTIS normal behaviour is the following: Two phases should be observed. 1st phase: All the power indicators light (all the power supply module indicators and the different power supply indicators on each other module) The CPUBDT board operates immediately and supplies all the clock signals the system needs; the 8 test signals (8Khz; 64 KHz; HT; ...
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. 2nd 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.
1 Power indicators - normally all on 2 CPUBdT board indicators 2a power supply normally on 2b 'IRQ’ normally fast flashing 2c 'ACT’ (Activity): Static (on or off): the software is not operating correctly Fast flashing: no reception board (DCTR) detected Slow flashing (1 second): the base station has received a configuration from a switch Very slow flashing (2 seconds): the base station has received a configuration from a switch but has switched to degraded mode (link with the switch has been cut) Very fa
2g 'REF’ Presence of a synchronisation by link (communications board) 2f 'GPS’ This indicator has different flashing frequencies, State 1: On 100ms / Off 100 ms No GPS module or defective GPS module State 2: On 100ms / Off 900 ms GPS module OK / Satellite acquisition in progress State 3: On 100ms / Off 5 s Module GPS OK / Antenna fault State 4: On 1 s / Off 1 s GPS module OK / Satellites OK State 5: On 2s / Off 2s GPS module OK / Satellites lost, synchronisation maintained for 8 min 30 s before switching to
12 Location for board communications (option) or a COM4 board for network mode connection to a switch using a V11 or G703 link, or a COM S board for connection to a PABX in autonomous mode. 13 Location for an optional DCTR board for a second diversity reception channel.
2.5 Handling 2.5.1 PLUG-IN MODULES The different modules must be plugged in or removed when power is off. Before removing a module, disconnect the eventual coaxial connections from its front face To remove a module, first remove the screws from the four corners of the front face of the module before gently extracting it by pulling it forward using the extraction handles. The power supply module has an auxiliary connector (mains input) which must be disconnected before completely extracting the block.
(frequency change) - it is therefore strongly recommended to disconnect the base station from the antenna and to reconnect it to a load before any tests. 2.6.
2.6.2 POWER FAULT ON A MODULE The power supply indicator on the module stays off even though the 5 volt indicator is on the power supply module: Each module has a fuse soldered to the 5 volt input, close to the 96 point Europe connector. If this fuse is broken, it is possible to replace it and closely watch when powering back on; if the fuse breaks again, the module must be returned for repair.
*Check according to your measurement bench: With a digital TETRA bench measure the frequency error at the UCM or PA output; it should be less than +-100Hz. If this is not the case, check the clocks. With an analogue bench, check the frequency error at the UCM or PA output; it should be less than +-100Hz. To do this keep the 2.25 KHz test button on the face of the UCM pressed down in order to observe a pure offset carrier compared to the TX BS frequency of 2.25 KHz.
If the BS is synchronised on its own LO (local oscillator), then adjust the CPUBDT LO using the potentiometer on the face (small hole) NeTIS MAINTENANCE GUIDE – Version 1.
If the BS is synchronised with a G703 link, then: Adjust the remote SWITCH reference if the CPUBDT is not synchronised with an external clock source If the SWITCH is synchronised with the GPS, the CPUBDT receives the GPS signal; check the rhythm of the GPS indicator on the CPUBDT The general check of the clock signals is carried out from the front face of the CPU_BDT module using the selector located on the top. All the clock signals must be perfectly recurrent, stable and exempt from jitter.
The transmission command indicator, CTX on the UCM is on Measure the RF signal output from the UCM board On a spectrum analyser the signal should have the following form: Central frequency Fo MHz / 10 KHz / division Fo: programmed radio frequency 1 KHz bandwidth 10dB/division If the spectrum only shows rays or if the spectrum overshoots the 25 KHz width, the UCM board is defective When a TETRA radio bench is available, the RF MHz signal will be analysed by the bench programmed on the RF frequency of your B
If the signal is correct but has a carrier on another channel, check the transmission channel programming and check the clocks; if these tests are correct, the UCM module is defective. If the signal is correct but on a carrier that is offset compared to the nominal value, check the clocks or the synchronisation sources. The complete constellation must comply with the diagram below: If the constellation presents points that spread radially, check the level.
Also check the signal spectrum output from the PA; if the 'shoulders' lift, check the level at the PA input; if this level is correct and the spectrum at this access has no lifting, the PA is defective. 2.6.6 CORRECT TRANSMISSION 2.6.6.
come from a disturbance or an incorrect adjustment of a duplexer or an incorrect separation of the transmission and receiver antennas; to refine the diagnosis stop the BS transmission by disconnecting the CPU from the PA. Checking a DCTR circuit Connect an RF generator to the DCTR input to be tested, adjusted to the programmed nominal receiver frequency on the BS; the RSSI level indications should correspond within 3 dB to the test generator level within the range of - 20 to - 90 dBm.
3. NeTIS-N 3.1 Presentation of the switch Each switch has the following modules: Power supply (ALIM) CPU (CPUBDT) IP phone sequencing board (SUPIP) one or more communications boards (COM3 or 4) for the connection of the switch to remote sites one or more communications boards (COM3 or 4) for the connection of the switch to the PABXs one or more CCT boards (CODEC) one or more COMS boards for S0 link management 3.1.
3.1.2 NUMBER OF CODEC BOARD (CCT) There should be as many CODECs as there are simultaneous phone communications exiting the TETRA world. One CCT board supports up to 16 CODECs.
NeTIS MAINTENANCE GUIDE – Version 1.
3.2 Launching When powering on, the power supply indicators light and the time base board operates immediately with the lighting of the following indicators: TFB "synchronisation signal presence" if a synchronisation signal is configured and present, LOC indicating the internal reference oscillator is correctly locked. The CPU board initialises and loads its resident flash disk software; this software is then launched with: 1. The survey of available resources (COM and CCT boards). 2.
3.
3.4 Removing subsets 3.4.1 PLUG-IN MODULES The different modules must be plugged in or removed when power is off. Before removing a module, disconnect the eventual coaxial connections from its front face. To remove a module, first remove the screws from the four corners of the front face of the module before gently extracting it by pulling it forward using the extraction handles. Before any interventions inside the chassis, the mains or 48V input at the rear of the chassis must be disconnected.
3.5.
3.5.3 CLOCK FAULT A high number of defects can have their origin in a clock fault; they should therefore be checked systematically before any research on the other signals. *Check on one BS in the network depending on your measuring bench: With a digital TETRA bench measure the frequency error at the UCM or PA output; it should be less than +-100Hz. If this is not the case, check the clocks. With an analogue bench, check the frequency error at the UCM or PA output; it should be less than +-100Hz.
All the clock signals must be perfectly recurrent, stable and exempt from jitter. Check in the following order: Position 7: TETRA clock symbol 18 KHz Position 5: clock time slot 70 Hz Position 4: clock frame 70 / 4 Hz = 17.5 Position 3: multiframe 1.02 second (18 frames) NeTIS MAINTENANCE GUIDE – Version 1.
4. NETWORK FAILURE SCENARIOS 4.1 None of the network equipment is operational The standby screen on the network management terminal indicates that the switch is no longer connected. The base stations are not transmitting or are in degraded mode. The dispatching stations are no longer operational. Telephone access is no longer operational. First check the position of the switching unit if the installation has one. If everything is normal the fault probably originates from the CPU board.
If, after re launch, the service console indicates that the switch connection is correct, refer to the following case where only the network management terminal is operational on the network. Otherwise, after checking the correct operation of the network management terminal and the link, change the CPU board. 4.
indicates that switch is operational and all the BSs out of order The network management terminal’s standby screen shows that the switch is connected and that no other equipment is connected (base station, telephone ...) or these indications are random. NeTIS MAINTENANCE GUIDE – Version 1.
The resources are correctly detected by the CPU Check the state of the 'Rx’ and 'ERR’ indicators on the communications boards (COM) If all the indicators are in a normal state, the problem comes from a resource assignment error Reload the equipment configuration file from the network management terminal (download). NeTIS MAINTENANCE GUIDE – Version 1.
4.4 BSs answer correctly on the NMT, but mobiles do not register onto the network. The base stations reply normally to a 'zoom' request from the service network management terminal. Mobiles do not register into the network. In the event file there are no mobile registrations; the messages below cannot be found in the log. In this specific case there is necessarily a problem on the site due to the absence of registration. NeTIS MAINTENANCE GUIDE – Version 1.
