ZyXEL Communications IES-5000 Manual De Usuario

IES-5000 Series User’s Guide

Chapter 4 Maintenance and Troubleshooting

53

Use the following tests if there is no voice. 

Systematically test wiring using a functioning telephone to determine if there is a wiring 
problem. If the connection is good, the telephone will return a dial tone. Letters in the figure 
shown next indicate the systematic tests to be done. Suppose you’re using installation scenario 
“B” as shown in the chapter on MDF connections. The logic for other scenarios should be 
similar.

Use steps A-D if there is no voice but you can transmit data. Use all of the steps if there is no 
voice and you cannot transmit data.

3

Check the telephone wire and connections between the MDF(s) and USER port(s). Refer 

to the pin assignments in the line card User’s Guide.

4

Check the telephone wire and connections between the MDF(s) and the CO port(s). Check 

the telephone wire mapping on the MDF(s).

5

Check the connection from the MDF(s) to the PBX or the telephone company PSTN or 

ISDN switch.

6

Make sure the in-house wiring works and is connected properly.

7

Repeat the steps above using a different DSL port.

Table 11   Voice Troubleshooting