ZyXEL Communications VES-1008, Hardware Installation Manual, Page: 41 / 55

VES-1000 Series Ethernet Switch
Hardware Troubleshooting 6-3
6.3 The WAN Link is down
STEP CORRECTIVE ACTION
1 Check that the Ethernet ports (ports 9 and 10 on a VES-1008 and ports 13 and 14 on the VES-1012)
connect to a WAN Ethernet using straight-through Category 5 UTP (Unshielded Twisted Pair) cables with
RJ-45 connectors.
2 If you enable port trunking, make sure the WAN switch also supports port trunking. See your VES-1000
Series User’s Guide for more details.
3 If you are daisy-chaining VES-1000 Series switches to the WAN switch, then make sure you are using
crossover cables between VES-1000 Series switches and a straight-through cable between VES-1000
Series switch and an Ethernet switch.
You also need to change the default VLAN configuration – refer to the VES-1000 Series User’s Guide .
4 The factory default settings for the Ethernet ports on the VES-1000 Series switch are:
Speed: Auto
Duplex: Auto
Flow control: On
Trunking: Disabled
If auto-negotiation is turned off on the VES-1000 Series switch, an Ethernet port uses the pre-configured
speed and duplex mode when making a connection, thus requiring you to make sure that the settings of
the WAN switch Ethernet port are the same to connect.
6.4 Testing Wiring
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 section
3.4.2 . The logic for other
scenarios should be similar.
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 the CO Telco port on the VES-1012 and MDF 2.
C. Test C determines if there is a wiring problem between the USER Telco port on the VES-1012 and MDF 3.
D. Test D determines if there is a building-wiring problem between the subscriber’s wall jack and MDF 3.