IBM eserver Cluster 1350 Installation And Service Manual page 76

For more information about the In-Reach LX-4000 terminal servers configuration
settings, see http://service.mrv.com/support/index.cfm.
60 IBM Eserver Cluster 1350 Installation and Service Guide
In-Reach_Priv>define port 21-40 que disable
In-Reach_Priv>lo port 1-20
In-Reach_Priv>lo port 21-40
In-Reach_Priv>init delay 0
The last command will cause the terminal server to save any configuration
changes and restart. The terminal server should now be fully operational.