SMC SMCD3GNV (Comcast)

User manual for Comcast

Feature sheet for the device (via archive.org)

This device is using TNETC4800 (TNETC4800ZDWGU) - a Puma 5 SoC.

The default SSID is HOME-XXXX where XXXX is the last two octets
 * of the wireless interface MAC address.

WiFi Certified

"8WMPN13..2A1G" is silkscreened on the wireless module in the FCC photos.

"P/N: 3833080408N0 REV 12.1" appears to be silkscreened on the board.
 * Hitron / HitronTechnologies is the presumed manufacturer.

This is a 4x4 cable modem.

Likely compatible services

 * (Comcast device database entry)