NEC nd-20292 manual AlITerminalseerminals

ND-20292

CHAPTER 5

APRIL, 1990

Intermittent Ring Problems

9

1 Line

Check memory block 1 t3 to

ensure line is programmed to ring on an existing station

*es

AlITerminalseerminals

IReplace at least one Multiline

Terminal which has problems.

and deny the DND feature.

elEnd

Done

Run the following tests:

affected can be isolated

1. Measure CO ring voltageto one COI-E ETU with AC meter (100 vat

2OHz) at the MDF.

2.Perform a second initialization.

3.Place an external ringer in front of the system on a worst case CO line. Find

out if the customer can

hear the external ringer at c times when the system

does not detect ringing on this line.

4.Replace TSW-E and

test. If problem is not

solved, perform 1 st

initialization, replace CPU- E ( ). Test system using default program.

1 af%{~~~t$$$&d	1
	Reset MMC-E ETU and test.	‘/
L	I

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