[amsat-bb] Re-purpose Cable Modems, headed to dumpsters ?

[Mac A. Cody]

Greg,

Interesting concept.  Thanks for the post!

I scanned through the various sources and I cannot find which cable modem or
firmware version is being used.  I also looked through the companion Github
https://github.com/stdw/bcm3383-reverse-engineering
without gaining any insight.

Looking at the OpenWrt webpage you referenced, the only cable modem 
mentioned
that specifically uses the BCM3383 is the Technicolor TC7200. There are
probably others, though.

I hope that more development occurs.

73

Mac / AE5PH

On 10/10/20 6:35 AM, Gregory Beat via AMSAT-BB wrote:
> Amateur Radio has a history of re-purposing Radio & Electronics surplus, for a variety of uses (receiving, transmitting, accessories, etc.).
>
> Recent posting on Github the past two weeks
> https://github.com/stdw/cm-sdr
>
> “cm-sdr” is a piece of software to turn a Broadcom BCM3383-based cable modem into a general purpose Software Defined Radio (SDR)
>
> In its current state, cm-sdr serves as a proof of concept. It can currently stream I/Q data to a peer via TCP. A script to demodulate and play FM radio broadcasts is also provided.
>
> cm-sdr is dependent on many functions and memory mapped registers in the unmodified firmware. Thus, at the moment it is highly tailored to one specific cable modem model and firmware version.
>
> ==
>
> Earlier work by OpenWrt with the Broadcom’s BCM33xx chipset.
> https://openwrt.org/docs/techref/hardware/soc/soc.broadcom.bcm33xx
>
> The BCM3383 DOCSIS 3.0 cable gateway System on a Chip (SoC) combines Broadcom's Full-Band Capture (FBC), dual-band concurrent Wi-Fi and a custom applications processor.
> https://www.broadcom.com/products/broadband/cable/modems/bcm3383
> Current Broadcom cable modem SoC offerings
> https://www.broadcom.com/products/broadband/cable/modems
>
> ==
> greg, w9gb
>
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