NEC NEAX2400 system manual Fusion Link Test Mode Loopback Point Designation

POST INSTALLATION TEST

Repair Procedure When LED Indicates Abnormality

•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

2.2.1Fusion 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		Fusion Link Controller sends test data pattern.
	PA-￿			Note
			Loopback
	FCHA
		front cable	to DTI card

LYR

Send Test ￿ Data Pattern

DTI Interface

D/I

Fusion Link ￿ Controller

Receive Test ￿ Data Pattern

Mode

FCH card

	9: Fusion Link Test Mode￿	Test is OK	LYR LED flashes.
9
	8: Standard Setting
FRONT VIEW		Flow of Test

Note: Loopback points are set by a DTI card.

Figure 6-3 Fusion Link Test Mode

Note: Be sure to initialize the FCH (PA-FCHA) card, after changing the setting of the Mode Switch.

2.2.2Loopback Point Designation

The DTI card can be set at one of the following loopback points: 1. Internal Loopback

ND-70185 (E)CHAPTER 6

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