This device is used and may require some additional work by your provider to make full use of. The only provider I was able to find that uses this device is Cox, so contact your local provider before purchase to verify compatibility. It is UNTESTED beyond basic power up and connectivity testing, i.e. I was able to connect to the LAN ports and see an IP address. Without it being on an active account, that was the most I was able to do.
Being a Cisco device, this is also useful to people wanting to work on their Cisco certifications.
From Cisco:
Designed for the active digital home or office, the DPQ3925 integrated router features a Dynamic Host Configuration Protocol (DHCP) server, Network Address and Port Translation (NAT/NAPT), and a Stateful Packet Inspection (SPI) firewall. These features allow the user to share a single high-speed public Internet connection as well as share files and folders between devices within the home network by attaching multiple wired and wireless devices in the user’s home or office to the wireless residential gateway. Consumer-friendly features like Wireless Protected Setup (WPS) and user-configured Parental Control can protect the home network from unwelcome intruders and family members from access to undesirable websites.
Features DOCSIS  Eight (8) bonded downstream channels with data rates in excess of 340 Mbps Four (4) bonded upstream channels with data rates in excess of 120 Mbps Designed to meet DOCSIS 3.0 specifications as well as backward compatibility with existing DOCSIS 2.0, 1.1 and 1.0 networks Enhanced packet processing technology to maximize performance Connections● Four 1000/100/10BASE-T auto-sensing/auto-MDIX Ethernet ports● High-performance broadband Internet connectivity to energize your online experience● 802.11n, Single Band 2.4 GHz 2x2 Wireless Access Point (WAP) with four Service Set Identifiers (SSIDs) or optional Dual-Band non-concurrent radio.● WPS, including a push-button switch to activate WPS for simplified and secure wireless setup● Two RJ-11 telephony ports for connecting to in-home wiring or directly to conventional telephones or fax machines Design and Function● Attractive compact design and versatile orientation to stand vertically, lie flat on the desktop or shelf, or mount easily on a wall● Dual color LED status indicators on the front-panel provide an informative and easy-to understand display that indicates the cable modem operational status● Rugged electronic components for long-term reliability● Color-coded connectors and cables for easy installation and setup Management● Software upgradeable by network download● Remote manageability using DOCSIS config file, SNMP, and/or XML Data Sheet © 2011 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. Page 3 of 12 Security● User-configurable Parental Control blocks access to undesirable Internet sites● Advanced firewall technology deters hackers and protects the home network from unauthorized access