Installation Guide

12 Prisma Gigabit Ethernet Media Converter Module Installation Instructions 4007998 Rev B
Additional Gigabit Features
Master/Slave Mode
This Master/Slave mode feature determines which clock will be used between the
Prisma Gigabit Ethernet Media Converter module and the device it is connected to (a
switch, NIC, or another Prisma Gigabit Ethernet Media Converter module, etc.).
Slave mode is the default setting. In Slave mode, the module receives and uses the
clock of the connected device. Master mode uses the module's clock. The
Master/Slave mode is only valid for the twisted pair link.
This Master/Slave mode feature is hardware configurable ONLY.
Preferred/Forced Mode
In addition to Master/Slave modes, the module also includes Preferred/Forced
modes for Master/Slave negotiation.
• Preferred mode helps determine whether the module should act as a Master or
Slave.
• Forced Mode should typically only be used when connecting to some legacy
switches, or when there is difficulty establishing a link.
This Preferred/Forced mode feature is hardware configurable ONLY.
Since most switches today typically function as Masters, we recommend configuring
the modules as indicated in the following chart.
DIP Switch Setting
S1-1 ON (Preferred)
S1-2 ON (Slave)
FX Negotiation on the Prisma Gigabit Module
The modules include the FX Negotiation feature that negotiates duplex mode. The
default for this feature is disabled. You must enable or disable this feature on both
ends of the connection or you may have difficulty establishing a link. If the device
you are connecting to the module does not support this auto-negotiation feature,
disabling the feature on the module forces the link up.
Continued on next page