User`s manual

2000591-001 Troubleshooting •• 79
DataNET Troubleshooting Guide
If an ANG-DN and a DataNET Hub fail to establish a link, this may be
due to one of two situations:
• a configuration conflict,
• a link signal quality problem.
If after connecting an ANG_DN port the DNETB Green LED never
comes on, or intermittently flashes between green and red, there may be
a configuration conflict. Configuration conflicts can be caused by cabling
or improper software configuration parameters.
Verify that the Channel A DataNET link is connected to the A Hub half
and that the Channel B DataNET link is connected to the B Hub half.
Verify that both Channels A & B utilize the same port number on their
respective Hub half. Then display the Port Status screen by connecting a
PC to the Configuration Port, logging in, and typing display links. Verify
that the two Ports are connected as expected.
The following example shows that port #1 (ANG_DN Channel A board) is
connected to the ADH Channel. Port#2 (ANG_DN Channel A board) is
also connected to the DataNET Channel A Hub. Note that the Ethernet
cross-link status is Online.
local> display links
Port: Medium: Status: Connected to:
1 ADH Copper Connected ADH Channel A
2 DN Copper Connected DN Channel A
Ethernet Online
Improper cable impedance matching. Verify that the impedance jumpers
located on J2 are set to match the attached cable impedance. The avail-
able selections are for 100, 120, and 150 Ohms.
Cable Shielding problems. Make sure the cable is of the recommended
type and that the twisted-pair shield is grounded at one end only. (Hub
end recommended.)
Instructions
Configuration
Conflicts
Cable Connected to
Wrong Hub or Port
Example
Cable Impedance
Matching
Cable Shielding