Testing Wiring; Table 110 Wiring Tests - ZyXEL Communications IES-1248-71 User Manual

Chapter 58 Troubleshooting

58.8 Testing Wiring

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.

Table 110 Wiring Tests

TEST
A.
B.
C.
D.
E.
F.
428
DESCRIPTION
Test A determines if there is a wiring problem between the TELCO (telephone company)
and MDF 1.
Test B determines if there is a wiring problem between MDF 1 and MDF 2.
Test C determines if there is a wiring problem between MDF 2 and your device.
Test D determines if there is a problem with your device's internal splitter.
Test E determines if there is a wiring problem between your device and MDF 3.
Test F determines if there is a building-wiring problem between the subscriber's wall jack
and MDF 3.
IES-1248-71/73 User's Guide