Create the token-ring line description

To create a token-ring line description, use the Create Line Description command and follow a series of steps.

1. Select an input/output adapter (IOA) to use with your line description. If you are not familiar with the capabilities of the IOA, see Token-ring IOAs.

   You are now at the Create Line Description (Token Ring) (CRTLINTRN) display. Notice that the system copied the name of the IOA to the Resource name field.

   Do not press Enter while at this display unless instructed to do so; otherwise, you might exit the display. To move from field to field, move your cursor or press the Tab key.

2. Type a name for your line description into the Line description field.
3. Press Enter twice, and then F10 (Additional fields).
4. Indicate the appropriate number of active controller descriptions that can use the line description in the Maximum controller field. See Connection establishment between LAN devices for more information about accessing a line description through a controller description.
5. In the Line speed field, indicate the speed of the IOA.
   Note: You enable automatic ring-speed sensing (automatic sense) when specifying *AUTO or 100M. Automatic sense starts initially at 100 megabit per seconds (Mbps). To use automatic sense successfully, you must enable it only on your system or on the switch to which your system connects. That is, do not enable both devices; otherwise, the correct speed might not be selected.
6. Select the duplex mode to use with your IOA.
   Note: Duplex mode negotiation occurs when you specify *AUTO or *FULL. Duplex mode negotiation initially starts at full-duplex mode. The switch must support duplex negotiation before you can successfully use this function. If you are not familiar with the capabilities of the IOA, see Token-ring IOAs.
7. Specify the largest possible frame size in the Maximum frame size field.
8. Assign an address to the IOA by using the Local adapter address field.

   To determine whether to use the burned-in address of the adapter or a locally administered address, read LAN IOA addresses. To use the burned-in address, accept the default value of *ADPT.

   To specify a locally administered address, find a valid address and enter it into the field. To find a valid address, move your cursor to the field and press F1 (Help) for more information.

9. List all the source service access points (SSAP) that your controller should use in the Source service access point field. Accept the default value of *SYSGEN or specify your SSAPs. If you define the SSAP values, move the cursor to the field and press F1 (Help) to help determine what values to use.

   For more information about whether you or the system should define the service access points (SAPs), see SNA connections to LAN protocols.

10. Leave the SSAP maximum frame field blank unless you need to enter a value.
11. If you use this line description with half duplex mode and with a 16 Mbps ring, you can take advantage of early token release. To do this, specify *YES in the Early token release field.
12. Press Enter to create the line description.
13. If an error occurs, the system might present to you some options to correct the error. Select the option that you want. You can also move your cursor to the error message and press F1 (Help) to see the cause of the error and the possible fixes.
14. Press F3 (Exit).

• Token-ring IOAs
  Some duplex modes and maximum frame sizes are supported by the input/output adapters (IOAs).
• Select a LAN IOA
  Before creating your line description, you must select the input/output adapter (IOA) to use with it.