ND-45383 (E)
CHAPTER 5
Page 129
Revision CD 1.0
3. FAULT DIAGNOSIS BY LOOP-BACK TEST
This section explains loop-back diagnosis by loop-back tests.
Loop-back diagnosis by loop-back tests is available in the following three kinds.
•
Loop-Back Diagnosis from the DLI to the DRU (Paragraph 3.1)
•
Loop-Back Diagnosis between the DLI and the Transmission Equipment (Paragraph 3.2)
•
Loop-Back Diagnosis between the DRU and the Transmission Equipment (Paragraph 3.3)
3.1 Loop-Back Diagnosis from the DLI to the DRU
This paragraph explains the procedure of loop-back diagnosis from the DLI to the DRU. When the DLI
and the DRU are connected via the transmission equipment, loop-back diagnosis between the DLI and the
transmission equipment and between the DRU and the transmission equipment must be performed in ad-
vance to this loop-back diagnosis. (Refer to Paragraphs 3.2 and 3.3)
3.1.1
Procedure for Loop-Back Diagnosis from the DLI to the DRU
START
PCM lamp (red) on the DLI card illuminates.
Set SW3-1 of the DLI card to UP.
On the DLI card, various lamps are indicating as
follows.
(a) PA-DAIA card
•
LINK (G):
ON, flashing, or OFF
•
CRC (R):
•
PCM (R):
•
FRM (R):
One or more than one
•
MFRM (R):
lamp illuminates.
•
RMT (R):
•
BLUE (R):
(b) PA-2DAIA card
•
LINK0, 1 (G):
ON, flashing, or OFF
•
ALM0, 1 (R):
One or more than one
•
RM/BLU0, 1 (R):
lamp illuminates.
A
Check to see if the power supply to the DRU is
normal or not, and also check the connection of
the transmission line between the DLI and the
DRU.
FAULT
:
DLI is faulty
Paragraph 4.1: DLI Fault
