Control field values
The token-ring control fields include an unnmubered information frame, an exchange identification frame, and a test frame. Their values are described here.
| Item | Description |
|---|---|
| x`03' | Unnumbered Information (UI) frame. This is the normal, or unsequenced, way in which token-ring adapter data is transmitted through the network. TCP/IP sequences the data. |
| x`AF' | Exchange identification (XID) frame. This frame conveys the characteristics of the sending host. |
| x`E3' | Test frame. This frame supports testing of the transmission path, echoing back the data that is received. |