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details: DOCSIS3.0 Multimedia Voice Gateway
hardware type: Cable Gateway
date added: 2010-05-10
updated: 2020-03-21
The SMCD3GNV is a DOCSIS 3.0 compliant wireless cable gateway with four 10/100/1000Base-T LAN ports, one USB port and 2 FXS ports for VoIP. It provides WAN throughput of up to 300Mbps. The router comes with a battery backup.

The integrated AP complies with IEEE 802.11n standard, providing wireless transmission speeds of up to 300Mbps. It supports WMM (QoS) to prioritize the traffic over the network. A WPS button allows for easy wireless security configuration.

This router features a built-in SPI firewall to protect the network against hackers and malicious attacks.
 SMCD3GNV Features
 Availability: discontinued
 LAN / WAN Connectivity
 WAN throughput: 300 Mbps
 WAN throughput upstream: 120 Mbps
 WAN ports: 1
 WAN port(s) type: Coax F-connector
 LAN ports: 4
 LAN ports type: Gigabit Ethernet (RJ-45)
 LAN ports auto cross-over: yes
 USB port(s): 1
for storage devices and printers
 USB port type: USB 2.0
 RJ-11 FXS VoIP phone ports: 2
 NAT routing: yes
 Multihomed: yes
 Port forwarding: yes
 Port triggering: yes
 DHCP server: yes
 DHCP client: yes
 QoS: yes
 UPnP: yes
 Cable Modem
 DOCSIS compliance: DOCSIS 1.0
 PacketCable: PacketCable 1.5 (VoIP)
 VoIP Protocols: SIP v2 (RFC 3261)
T.38 (Fax over IP)
 VoIP Audio Codecs: G.711 (PCM)
G.729 (a/b)
 VoIP Voice Features: Echo Cancellation (G.165/G.168)
Adaptive Jitter Buffer
Caller ID
Voice Activity Detection (VAD)
Comfort Noise Generator (CNG)
 Maximum Wireless Speed: 300 Mbps (Wi-Fi 4)
 WiFi standards supported: 802.11b (Wi-Fi 1)
802.11g (Wi-Fi 3)
802.11n (Wi-Fi 4)
 Wifi security/authentication: WEP
 WiFi modes: Access point
 Transmit Power: +18 dBm
 Receiver Sensitivity: -76 dBm
 Multiple SSID: yes
 WMM (QoS): yes
 WMM-PS (QoS): yes
 WPS (Wi-Fi Protected Setup): yes
 SPI firewall: yes
 Device Management
 Administration: Web-based (LAN)
Quick Setup Wizard
TFTP (RFC 1350)
 Firmware upgradeable: yes
 Misc hardware info
 RAM: 16 Mb
 SNMP support: SNMP v.1, SNMP v.2, SNMP v.3
 Print Server: yes
 Product page:

Please use the Add Comment function below to review devices you have used (please be descriptive). If you find an error in our database, or have additional information about the product, please
  User Reviews/Comments:
by anonymous - 2011-09-23 22:31
This modem is dissapointing. Its slick and looks good, but the firmware is crippled, the wireless has a poor range and throughput, and the Gigabit ethernet is not that fast.

An Arris EMTA without the built in Router is a better bet...
by anonymous - 2011-10-24 01:39
Can you PLEASE give instructions on how to change NAT types for online gamers. I have enabled the UPnP but still nothing and I still get NAT errors for a moderate NAT setting.
by mcurran - 2012-01-04 00:05
Where is the option to allow DHCP offers/releases through Coaxial Line? I don't see any coax. devices through the firmware/web ui, however, the STB's on my home network must be connected? Do I need MoCA, or is there an option to enable coax.? Please let me know Comcast is clueless... They don't support home networking I guess...
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