Listener Configuration, VI Protocol

VI identifies a listener protocol address by a disc number. The discriminator number is similar to the port used by TCP/IP.

Use the standard discriminator number of 1521

Select this option to listen on the default discriminator of 1521. Oracle Corporation recommends that you use this number.

Use another discriminator number

Select this option to specify another discriminator number other than 1521. The number can be up to 16 digits.