This directory contains firmware images read out of Copper Mountain's CR201i
and CR201s CPE units.  These are IDSL to Ethernet and SDSL to Ethernet bridges
which work only with CM's proprietary encapsulation which we've nicknamed
CM 1483.  You can read more about these devices here:

http://ifctfvax.Harhan.ORG/OpenSDSL/CM/Rocket/

The beast has an MC68LC302 microprocessor with firmware stored in two Am29F010
flash memory chips (PLCC32 package, socketed).  These are 128K x 8 chips and
the microprocessor has a 16 bit wide data bus, so everything fits.  U18 and U20
sit on the MSB and LSB halves of the data bus, respectively.  We have read the
contents of these chips in two of our units (one IDSL, one SDSL) and the images
are here.  Reverse engineering of the SDSL code has helped us understand CM's
proprietary startup sequence extension for data rate autoconfiguration (see
startupseq.txt in the parent directory) and gain many other insights.

[is]dsl-U18.bin		-- Images read out of the respective chips
[is]dsl-U20.bin
[is]dsl-firmware.bin	-- Complete firmware image as seen by the microprocessor

We have also developed our own open source firmware for these units replacing
CM's, see the /pub/net/PHY/SDSL/hackorocket directory on this site.