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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

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Siemens Advance Network Gateway Manual de usuario Pagina 84