Use $::SPEED to config port speed.
For example: #Set Port stream and send the stream. struct_new myNSPhyConfig NSPhyConfig set myNSPhyConfig(ucActiveMedia) $::COPPER_MODE CheckError HTSetStructure $NS_PHY_CONFIG 0 0 0 myNSPhyConfig 0 $hub $slot1 $port1 CheckError HTSetStructure $NS_PHY_CONFIG 0 0 0 myNSPhyConfig 0 $hub $slot2 $port2 unset myNSPhyConfig CheckError HTSetSpeed $::SPEED_100MHZ $hub $slot1 $port1 CheckError HTSetSpeed $::SPEED_100MHZ $hub $slot2 $port2 CheckError HTDuplexMode $::FULLDUPLEX_MODE $hub $slot1 $port1 CheckError HTDuplexMode $::FULLDUPLEX_MODE $hub $slot2 $port2