Siemens DataNET Hub (DNH) - Manual (Page 73)

2000585-001 Data Communications Setup •••• 65
Troubleshooting
This chapter is intended for maintenance personnel.
Failure of the DNH to establish a link is the principle cause of most hub
failures. Typical problems are:
• Configuration Conflict
• Link Signal Quality
The DNH port green LED is off, or intermittently flashes between green
and red. This can indicate a configuration conflict caused by a faulty ca-
ble or a wrong connection or improper configuration parameters.
1. Inspect all cable and connectors for damage.
2. Verify that the cable is connected to the correct Hub half and correct
Port.
3. Verify that the Channel ‘A’ link is connected to the ‘A’ Hub half and
that the Channel ‘B’ link is connected to the ‘B’ Hub half.
4. Verify that both Channels A & B use the same port number on their
respective Hub half.
5. Display the Port Status screen by connecting a PC to the Configura-
tion Port, logging in, and then typing display links. Verify that all
Ports are connected as expected; see example below.
The following example shows that Port 1 on the B Hub is incorrectly con-
nected to Port 1 Channel A, on device 172.16.99.7.
local> display links
Port status for 172.16.99.3, B
Port: Medium: Status: "A" connected to: "B" connected to:
1 Copper Validation 172.016.099.007, 1A
2 Copper Unconnected
3 Copper Unconnected
4 Copper Unconnected
5 Copper Unconnected
6 Copper Unconnected
7 Copper Unconnected
8 Copper Unconnected
9 Copper Unconnected
Ethernet Offline
The Ethernet port is always shown as Offline on the ‘B’ Hub half because
the Ethernet port is always disabled on the ‘B’ Hub.
Description
Configuration
Conflicts
Cabling errors:
Example
NOTE