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ds: Linux kernel module for Cisco HDLC encapsulation

PDS Linux Kernel Device Driver is a driver for E1 devices connected viaEthernet. Currently, it is assumed that only one E1 device is connected to oneEthernet port: the driver sends messages via broadcast. (Adding the ability towork via unicast is not difficult, just no one needs it at the moment.)

The driver allows you to work in the so-called fake mode, in which it stillreturns a positive status without receiving a response from the device. (Inconfiguration mode, data transmission is stateless.) In this mode, the PDS canbe used as a virtual E1 tunnel: for example, it is useful for automated testingof E1/DAHDI configuration system.

As an add-on, there is also a simple implementation of the Cisco HDLC Ethernetencapsulation module. Keepalive messages are not supported.