Figure 6-3 Fusion Link Test Mode - NEC NEAX 2400 IMX Manual

• FCH (PA-FCHA) switch setting
Make sure that the following keys are set properly:
• Dch TS designation (0ch - 23ch: SW11, SW12, SW13)
• Data Link Signal Logic (positive/negative: SW14-1)
• Fusion Data Link Speed (48/56/64 kbps: SW14-2, 3)
• LAPD Signal Link (user/network: SW14-4)
• 24DTI (PA-24DTR) switch setting
Make sure that the keys are properly set on the card. See the NEAX2400 IMX Circuit Card Manual.
If the Fusion link is not established using this repair procedure, perform the Fusion Link Test.
2.2 How to Perform the Fusion Link Test
2.2.1 Fusion Link Test Mode Setting
To set the FCH card in Fusion Link Test Mode, set the Mode Switch to 9. Initialize the FCH card using
the MB key. When the Mode is 9, the Fusion Link Controller on the FCH card sends a test data pattern.
When the same pattern is received again the PM activates the LYR LED, flashing the LED at 60-INT,
which means the test result is OK.
To perform a Fusion link test, set the Mode switch to 9.
FCH
PA-
FCHA
LYR
Mode
9
FRONT VIEW
Note: Loopback points are set by a DTI card.
Be sure to initialize the FCH (PA-FCHA) card, after changing the setting of the Mode Switch.
Note:
2.2.2 Loopback Point Designation
The DTI card can be set at one of the following loopback points:
1. Internal Loopback
Fusion Link Controller sends test data pattern.
Send Test
Data Pattern
9: Fusion Link Test Mode
8: Standard Setting

Figure 6-3 Fusion Link Test Mode

ND-70185 (E)
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POST INSTALLATION TEST
Repair Procedure When LED Indicates Abnormality
Note
Loopback
to DTI card
front cable
DTI Interface
D/I Receive Test
Data Pattern
Fusion Link
Controller
FCH card
Test is OK
Flow of Test
LYR LED flashes.
CHAPTER 6
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Revision 3.0