GE LOGIQ E9 Service Manual page 289

GE
D 5535208-100, R
IRECTION
7-5-8-1 Digital Receive (cont'd)
Tests the signal path from the DRX to the GFI to the BEP. Also tests for latency signals of the DRX or
Nathan to the GFI.
Name: FDEMOD Signal Test
Description: Signal path test starting from the Fixed Demod on the GFI
Run Time: 00:03
If this test failed:
1.) Replace the PCIe cable.
2.) If GFI test above fails, replace the GFI board.
3.) Replace the BEP.
NOTE: The DRX High Speed Bit Error Rate Diagnostic Test Fails intermittently (not reliable) when run
on a system with MLA4 DRX3.1 (5301040-4) with production software revision R1.0.6 ONLY.
The intermittent errors encountered by the diagnostic may not be due to real failure; therefore the DRX
High Speed Bit Error Rate Diagnostic test results are not reliable when under this configuration.
This problem does not affect in any way the operation or performance of the LOGIQ E9, it is only related
to the diagnostic result.
DO NOT REPLACE BOARDS DUE TO THIS FAILURE.
The Diagnostic "DRX Signal Path" tests the same functionality without being affected by the issue and
will be a reliable test to troubleshoot any issue with the DRX board since it checks bit by bit all vector
data send to the FE DRX back at the backend PC.
Name: DRX High Speed Bit Error
Description: High Speed Bit Error Test on the DRX
Run Time: 00:03
If this test failed:
1.) Swap DRX boards to determine if the failure point changes as the boards are moved.
2.) Replace any failed DRX boards.
3.) Interface to GFI may be cause of the failure. See:
Name: DRX IF FPGA Test
Description: Signal path test starting from IF FPGA on DRX boards
Run Time: 00:03
If this test failed:
1.) Swap DRX boards to determine if the failure point changes as the boards are moved.
2.) Replace any failed DRX boards.
3.) Interface to GFI may be cause of the failure. See:
Name: DRX ASIC Test
Description: Digital Signal path tests sourced from output of Nathan ASIC
Run Time: 00:03
1.) Swap DRX boards to determine if the failure point changes as the boards are moved.
2.) Replace any failed DRX boards.
3.) Interface to GFI may be cause of the failure. See:
. 2
EV
Chapter 7 Diagnostics/Troubleshooting
LOGIQ E9 S
7-5-8-3 "GFI" on page 7-46.
7-5-8-3 "GFI" on page 7-46.
7-5-8-3 "GFI" on page 7-46.
M
ERVICE ANUAL
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