10
Auto Negotiation
The following chart states the availability of the Auto Negotiation feature on media
conversion modules.
Auto Negotiation Product Comparison
10 Mbps Modules
Auto Negotiation Not Available
100 Mbps Modules
Auto Negotiation DIP Switch Selectable
10/100 Mbps Modules
Auto Negotiation
Always Enabled
Auto Negotiation on 100 Mbps Modules
When Auto Negotiation is enabled, the media converter negotiates as a 100 Mbps
Full-Duplex device; if the device the media converter is connected to can operate at
100 Mbps Full-Duplex, a link will be established.
If the twisted pair port on the other device does not have the ability to Auto
Negotiate, or if a 100 Mbps Half-Duplex connection is desired, Auto Negotiation on
the media converter must be disabled. Half- and Full-Duplex settings must be
manually set and match on both end devices to which the media converters are
connected. The diagram below shows a typical application, followed by a table with
three possible configurations.
End to End Connection
Switch
TX/FX
Half-Duplex Manually
configure HDX
Auto Negotiation Off
Full-Duplex Manually
configure FDX
Auto Negotiation Off
Full-Duplex
Auto Negotiation On
Auto Negotiation On
Configure Auto Negotiation on 100 Mbps Modules with a 3-pin jumper block located
on the module’s PCB or DIP Switch, depending on the Model. Refer to the Jumper
Configuration Table of this manual to verify jumper position and default setting.
Auto Negotiation on 10/100 Switching Modules
Auto Negotiation is a standard feature on 10/100 Switching Modules. The fiber port
always operates at 100 Mbps FDX; the copper port auto-senses the connected
device’s speed and duplex mode: 10 Mbps or 100 Mbps and HDX or FDX (including
Flow Control).
