Product manual

Maintenance, Test and maintenance software
Technical Product Manual - DCT1800-GAP
TD 92093 (1/LZBNB 103 108 R4D) / 2006-03-09/ Ver.C
© 2006
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2.3 Testing
The T&M module has three tests available to check the overall system performance and to report any
deviations in performance. These tests are:
• Board power-on test
•Ack test
• 24h test
2.3.1 Board power-on test
Every board is tested before it becomes operational. The test is initiated after insertion of the board
in an operational system, but also after system power-on.
The board power-on test has the following phases:
•Board test
• Board announcement
• Test result messaging
• Watchdog test
Board test
As soon as power is applied to the system or when a single board is inserted, a self test is initiated
on each board resp. on the single board. This self test is under control of the board controller. During
this board test, the board controllers and peripherals go through different states. The board test
consists of:
ROM/RAM test All processors on the board start up a ROM/RAM test. The ROM’s
checksum is verified and a read/write test is performed in RAM.
Communication test All board controllers test if they can communicate with the
peripheral circuits on the board.
Internal loopback test A ‘speech-signal’ is generated at one end of the board on a speech
paths and routed to the other end where a loopback is created,
thus re-routing the signal to its originating point for verification.
Thus, continuity tests are performed for all speech paths on the
board. On the CLU, CLU-S and the CLU part of the SLU, the
speech test is looped back by the base station thus testing the
wiring to the base stations as well.
State test The various states in which a board can be, are tested.
DTU link test For each DTC the primary rate communication link is checked.
Board announcement
After completion of the board test, the board controller will set a message ready for the CPU. By means
of this message the board will identify itself to the CPU. A poll processor on the CPU board will take
care that the message is collected from the board. By this board announcement the CPU knows the
exact position of each board in the system. After the board announcement, board controllers and
peripherals will have the status NEW.
Test result messaging
After the board announcement, the CPU requests the board to send the result of the board test. Upon
the kind of message received, T&M may decide to re-test a board and to make an error report. When