Furthermore, it incorporates a carrier detect circuitry. All of the above modems only support half duplex communications. It then simply starts to send as soon as there's a packet to transmit and does not care about DCD, i.e. it starts to send even if there's someone else on the channel. This command is required by some implementations of the DAMA channel access protocol. The Interface of the driver Unlike previous drivers, the driver is no longer a character device, but it is now a true kernel network interface.
Installation is therefore simple.
Configuring the driver Every time the driver is inserted into the kernel, it has to know which modems it should access at which ports. This can be done with the setbaycom utility. The channel access parameters can be set with sethdlc -a or kissparms. Note that both utilities interpret the values slightly different. To avoid collisions on the air, the driver must know when the channel is busy.