- 3com Network Interface Card User Guide
Table Of Contents
- About This Guide
- Introduction
- Overview
- 3CR990 NIC Features
- DynamicAccess LAN Agent
- Windows2000 Offload Features
- Installing and Connectingthe NIC
- Installing NICDrivers in Windows
- Installing DynamicAccess Software in Windows
- Overview
- Installing the DynamicAccess LAN Agent for a Client NIC
- Installing DynamicAccess Software for a Server NIC
- Configuring Groups and VLANs for a Server NIC
- Planning the Configuration
- Working With Server Features
- Creating a Group
- Adding NICs to a Group
- Specifying a Dedicated IP Address
- Changing an IP Address
- Creating a VLAN
- Specifying Traffic Priorities
- Saving the Configuration
- Disabling Load Balancing for a Group
- Changing the Primary NIC
- Removing a NIC from a Group
- Deleting or Editing a VLAN
- Displaying NIC Properties
- Displaying Group Properties
- Specifying Failover from Gigabit to 10/100 PCI
- Troubleshooting a Load Balancing Configuration
- Changing Windows2000 Property Settings
- Identifying Windows 2000 Miniport and LAN Connections
- Using Windows2000 Offload Features
- Installing DynamicAccess LAN Encryption Software
- Installing NetWare Client and ServerDrivers
- Overview
- Installing and Configuring the NetWare Server Driver
- Using the Latest Support Packs
- Obtaining NetWare Loadable Modules
- Server Software Installation Requirements
- Installing the NetWare 3.12 Server Driver
- Installing the Server Driver for NetWare 4.11 and 5.0 UsingINETCFG
- Installing the Server Driver and DynamicAccess Technology Using AUTOEXEC.NCF
- Installing Multiple Server NICs
- Verifying the PCI Slot Number
- Installing Server Features
- Configuring Groups
- Verifying the Installation and Configuration
- Changing NetWare Driver Configuration Parameters
- Maintaining Groups
- Configuring the NIC
- Configuring IP Security
- Troubleshooting the NIC
- Running NIC Diagnostics
- Obtaining Drivers
- Specifications and CablingRequirements
- Installing the 3ComDMIAgent
- EtherCD Content and Navigation
- Installing a 3Com NIC While Installing the NOS
- Technical Support
- Index
- FCC Class B Statement
- FCC Declaration of Conformity
- Industry Canada Class B Emission ComplianceStatement
- Avis de Conformité à la Réglementation d’IndustrieCanada
- VCCI Class B Statement
- 3Com End User Software License Agreement
- Product Registration
![](/manual/3com/3cr990svr95/3com-network-interface-card-user-guide/images/img-136.png)
Troubleshooting a Network Connection 137
Troubleshooting Hubs
A crossover cable can be used to identify the type of failure
when hub performance or connectivity is in question.
To use a crossover cable:
1 Connect a file server and a client PC back-to-back
with a crossover cable to verify that the NIC and
network operating system are properly configured.
2 To make a crossover cable, connect TD+ to RD+ and
TD– to RD–.
The cable performs the crossover that is usually performed
by the hub.
Cabling Pinouts
The following illustration compares the cabling pinouts for
straight-through and crossover cables.
If the file server and client PC function together as a small
network, then either the existing cabling or the hub is
failing.
When a crossover cable is used, the LED on the NIC functions
differently than it would under normal operating conditions.
For example, with a correct crossover connection, the LED
lights, whereas with a straight-through connection, the LED
does not light. If you make a crossover cable and the polarity
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Straight-through
10BASE-T cable
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Crossover
10BASE-T cable
TD+
RD+ RD+
TD+
TD– TD–
RD– RD–