Motorola SURFboard SBG6580

Overview
"SBG6580 MAIN BOARD", "571511-001 REV: 2", "Otc-16-2009", and "MADE IN TAIWAN" is silkscreened on the board in the FCC photos.

The default SSID pattern appears to be SBG6580XX (where XX appears to be two hex digits, upper case letters) or MOTOROLA-XXXXXX (where XXXXX is presumably the last three octets of the BSSID minus a character).
 * Wi-Fi 2T2R 2.4/5GHz switchable

Presumed to use a 1C:14:48 OUI

P/Ns

 * 570761-001-00, MOTOROLA-XXXXX SSID format, E4:83:99 OUI, Assembed in China, FCC ID: W5HSBG6580
 * 570763-006-00, unknown SSID format, B0:77:AC OUI, Assembled in China, FCC ID: W5HSBG6580
 * 570761-007-00, SBG6850XX SSID format, 2C:9E:5F OUI, Assembled in China, FCC ID: W5HSBG6580A
 * 583315-006-00, SBG6850XX SSID format, 94:CC:B9 OUI, Assembled in China, FCC ID: W5HSBG6580A

Likely compatible services

 * (Comcast device database entry)

Links of Interest
User guide

Teardowns Motorola SBG6580 - BCM3380 modem IC, though according to this the switch is BCM53115SKFBG (it appears to be Broadcom BCM53125 from the FCC photos)