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+Firmware is required for this device: http://accessrunner.sourceforge.net/
+While it is capable of managing/maintaining the ADSL connection without the
+module loaded, the device will sometimes stop responding after unloading the
+driver and it is necessary to unplug/remove power to the device to fix this.
+Note: support for cxacru-cf.bin has been removed. It was not loaded correctly
+so it had no effect on the device configuration. Fixing it could have stopped
+existing devices working when an invalid configuration is supplied.
+There is a script cxacru-cf.py to convert an existing file to the sysfs form.
+Detected devices will appear as ATM devices named "cxacru". In /sys/class/atm/
+these are directories named cxacruN where N is the device number. A symlink
+named device points to the USB interface device's directory which contains
+several sysfs attribute files for retrieving device statistics:
+ Information about the remote headend.
+ Configuration writing interface.
+ Write parameters in hexadecimal format <index>=<value>,
+ separated by whitespace, e.g.:
+ "1=0 a=5"
+ Up to 7 parameters at a time will be sent and the modem will restart
+ the ADSL connection when any value is set. These are logged for future
+* downstream_attenuation (dB)
+* downstream_rate (kbps)
+* downstream_snr_margin (dB)
+ Downstream stats.
+* upstream_attenuation (dB)
+* upstream_rate (kbps)
+* upstream_snr_margin (dB)
+* transmitter_power (dBm/Hz)
+ Upstream stats.
+ Error counts.
+ Indicates that ADSL support on the device
+ is/can be enabled, see adsl_start.
+ "attempting to activate"
+ "channel analysis"
+ Changes between "down" and "attempting to activate"
+ if there is no signal.
+ "not connected"
+ "" (when not connected)
+ "ANSI T1.413"
+ "ITU-T G.992.1 (G.DMT)"
+ "ITU-T G.992.2 (G.LITE)"
+ Count of total attempts to initialise ADSL.
+To enable/disable ADSL, the following can be written to the adsl_state file:
+ "restart" (stops, waits 1.5s, then starts)
+ "poll" (used to resume status polling if it was disabled due to failure)
+Changes in adsl/line state are reported via kernel log messages:
+ [4942145.150704] ATM dev 0: ADSL state: running
+ [4942243.663766] ATM dev 0: ADSL line: down
+ [4942249.665075] ATM dev 0: ADSL line: attempting to activate
+ [4942253.654954] ATM dev 0: ADSL line: training
+ [4942255.666387] ATM dev 0: ADSL line: channel analysis
+ [4942259.656262] ATM dev 0: ADSL line: exchange
+ [2635357.696901] ATM dev 0: ADSL line: up (8128 kb/s down | 832 kb/s up)