Configuration Parameters

The configuration parameter that is explained in this section is supported by all PCI token-ring device drivers.

Ring Speed

The device driver supports a user-configurable parameter that indicates if the token-ring is to run at 4 or 16 Mbps.

The device driver supports a user-configurable parameter that selects the ring speed of the adapter. There are three options for the ring speed: 4, 16, or autosense.

1. If 4 is selected, the device driver opens the adapter with 4 Mbits. It returns an error if the ring speed does not match the network speed.
2. If 16 is selected, the device driver opens the adapter with 16 Mbits. It returns an error if the ring speed does not match the network speed.
3. If autosense is selected, the adapter guarantees a successful open, and the speed used to open is dependent on the following:
   • If the adapter is opened on an existing network the speed is determined by the ring speed of the network.
   • If the device is opened on a new network and the adapter is new, 16 Mbits is used. Or, if the adapter opened successfully, the ring speed is determined by the speed of the last successful open.

Software Transmit Queue

The device driver supports a user-configurable transmit queue that can be set to store between 32 and 2048 transmit request pointers. Each transmit request pointer corresponds to a transmit request that might be for several buffers of data.

Receive Queue

The device driver supports a user-configurable receive queue that can be set to store between 32 and 160 receive buffers. These buffers are mbuf clusters into which the device writes the received data.

Full Duplex

Indicates whether the adapter is operating in full-duplex or half-duplex mode. If this field is set to yes, the device driver programs the adapter to be in full-duplex mode. The default value is half-duplex.

Attention MAC Frames

The device driver supports a user-configurable parameter that indicates if attention MAC frames should be received.

Beacon MAC Frames

The device driver supports a user-configurable parameter that indicates if beacon MAC frames should be received.

Network Address

The driver supports the use of the device's hardware address as the network address or an alternate network address configured through software. When an alternate address is used, any valid individual address can be used. The most significant bit of the address must be set to zero.