Testing of security of modems?

[John Smith <mmu6culus () gmail com>]

Is there existing any methodology to test security of modems?

I am not asking about "war driving" (penetration testing of modem entry 
points to the computer systems/networks) but testing of modems as devices?

What features shall one look for while assessing the security of modems 
of various types (dial model, cable modem, DSL modem, GPRS modems, other 
wireless modems, etc)?

Are there any publicly accessible (or commercial) modem testing tools?

Thank you,
John

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