Additional Gigabit Features - IMC Networks iMcV-Gigabit Operation Manual

Additional Gigabit Features

Master/Slave Mode
The Master/Slave mode feature determines which clock will be used between the
iMcV-Gigabit and the device it is connected to (a switch, NIC, or another iMcV-
Gigabit, etc). Slave mode (S1-2 is ON) is the default setting. In Slave mode, iMcV-
Gigabit will receive and use the clock of the connected device. Master mode uses
iMcV-Gigabit's clock. The Master/Slave mode is only valid for the twisted pair link
and is hardware configurable only.
On the iMcV-Gigabit (-00) module, Master/Slave modes are referred to as
Switch/Repeater modes; Switch is the Master mode and Repeater is the Slave mode.
Check the Installation Troubleshooting section on page 11 if you are having difficulty
linking up.
Preferred/Forced Mode
In addition to Master/Slave modes, iMcV-Gigabit (-10) modules also include
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. The default is Preferred mode (S1-1 is ON). This feature
is hardware configurable only.
Since most switches today typically function as Masters, IMC Networks recommends
configuring iMcV-Gigabit (-10) modules as indicated in the following chart:
DIP Switch
S1-1
S1-2
Duplex Mode on iMcV-Gigabit (-00)
The Duplex mode settings of the iMcV-Gigabit (-00) converter are used with Auto-
Negotiation. The default duplex mode for iMcV-Gigabit (-00) is Full-Duplex. In this
mode, the module advertises Full-Duplex during Auto-Negotiation. To make the unit
advertise and operate in Half-Duplex, move DIP switch 1 to the OFF position. Auto-
Negotiation takes place on the twisted-pair interface only. When the twisted-pair
interface is resolved, the configuration will be encoded into the fiber side. No Auto-
Negotiation takes place on the fiber side. As a result, it is usually best to disable
Auto-Negotiation on the remote fiber end. Since most gigabit networks run at Full-
Duplex, IMC Networks recommends setting the remote fiber end to Full-Duplex.
Setting
On-Preferred
On-Slave
5