ZyXEL Communications IES-2500, User Manual, Page: 51 / 65

IES-2500 User’s Guide
Hardware Troubleshooting 9-3
9.5 The WAN Link is Down
Table 9-5 WAN Link Troubleshooting
STEP CORRECTIVE ACTION
1 Check that the uplink and downlink ports on the management switch card are properly connected to a
WAN Ethernet using either copper Ethernet cables or fiber optic cables.
2 If you enable port trunking, make sure the peer WAN switch also has port trunking enabled; see the
management switch card’s
User’s Guide .
9.6 Fan ALM LED Is On
The fan module’s red ALM (alarm) LED lights when the fan is not rotating fast enough. The fuses may need to be
replaced or fan module may be defective. Follow the steps on removing and installing a fan module in Chapter 7,
Fan Maintenance .
9.7 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.
A. Test A determines if there is a wiring problem between the CO and MDF 1.
B. Test B determines if there is a wiring problem between MDF 1 and MDF 2.
C. Test C determines if there is a wiring problem between MDF 2 and the USER Telco-50 connector on the
IES-2000 splitter chassis.
D. Test D determines if there is a problem with the splitter chassis card or splitter chassis.
E. Test E determines if there is a wiring problem between the USER Telco-50 connector on the splitter chassis
and MDF 3.
F. Test F determines if there is a building-wiring problem between the subscriber’s wall jack and MDF 3.