ADTRAN 1200312L1, Руководство пользователя

Страница: 13 / 30

Chapter 2. Installation
61200312L1-1 VCOM Module User Manual 2-3
POWER-UP AND INITIALIZATION
After installing the VCOM Module into the ATLAS 550 chassis, the front
panel
S
TATUS
indicator blinks red, yellow, and green for a time. The
S
TATUS
indicator remains solid green when the VCOM Module is ready to use. At
this time, you can invoke a system self-test; refer to the ATLAS 550 User
Manual for details.
FAILED SELF-TEST
The terminal menu self-test log records any self-test failures for the VCOM
resource module. Resources that fail self-test are disabled after power-up
initialization is complete. Performing a hardware-level reset via the terminal
menu may recover these failed resources.
Self-test for the VCOM resource module consists of two basic steps: verifica-
tion of the module’s interface with the ATLAS 550 controller chassis and
then verification of the module’s voice compression resource data paths.
During tests of the interface between the module and the controller, both
components exercise their circuits for the DUAL-PORT RAM, or DPRAM.
Once this interface is verified, testing proceeds to the voice compression
data paths.
The controller generates a special data stream, known as QRSS, that is indi-
vidually sent to each voice compression resource. The voice resource must
return the data error-free; the error-detection circuits are then checked by in-
tentionally inserting an error that must be detected. This testing may take up
to almost 30 seconds per voice resource and once started, must be allowed
to run to completion.
This self-test sequence may take up to eleven (11) minutes.