Surfboard SB6120 Docsis 3 Cable Modem

Motorola (it is now under Arris umbrella) offers various models of Cable modem and one of its popular DOCSIS 3.0 cable modem is Surfboard SB6120 at the first time DOCSIS 3.0 cable modem is introduced.

What this product does

Motorola Surfboard SB5101 DOCSIS 2.0 cable modems are so popular for delivering high speed cable broadband internet services to the subscriber’s premises. When many Cable services upgrade their infrastructure to support DOCSIS 3.0 or EuroDOCSIS 3.0, Motorola introduces Surfboard SB6120 DOCSIS 3.0 cable modem and then followed by the faster one is Surfboard SB6121 DOSIS 3.0 cable modem.

Note: Arris today offers the fastest cable modem with 32x channel bonding – the Surfboard SB6190 Docsis 3 cable modem – ready for the next generation of faster Cable network infrastructure.

Main features

  • Docsis 3.0 cable modem
  • channel bonding of up to 4 downstream channels and 4 upstream channels, up to 100Mbps upstream downstream
  • includes Gigabit Ethernet Port, ideal in connecting to any Gigabit wifi dual band routers
  • Supports IPv6
  • Supports Windows, Mac, Linux and Unix

DOCSIS 3.0 technology was introduced to the market to support the demand of future IP addressing IPv6. DOCSIS 3.0 technology infrastructure increases the transmission speed both upstream and downstream but still backward compatible with DOCSIS 2.0. The DOCSIS 3.0 standard for Europe is different which is under EuroDOCSIS 3.0. Surfboard SB6120 modems are based on DOCSIS 3.0 technology.

Motorola SB6120

4 Channel bonding

Surfboard SB6120 / SB6121 DOCSIS 3.0 cable modems enable channel bonding of up to 4 downstream channels and 4 upstream channels to allow you experience the advanced multimedia with data rates of well over 100 Mbps in each direction. The modem is compatible with mostly all the operating systems including Windows®, Macintosh® and UNIX®.

Gigabit Port

Surfboard SB6120 / Sb6121 DOCSIS 3.0 cable modems include a 10/100/1000Base-T Gigabit Port for incredible wired network speeds when connecting to any Gigabit wireless routers in homes or in small business offices. Many wireless routers today are equipped with Gigabit WAN and LAN Ethernet ports that can take benefit of this cable modem.

Connect to router

Surfboard SB5101 DOCSIS 2.0, SB6120 / Sb6121 DOCSIS 3.0 cable modems are modem-only devices and do not include the routing function. Therefore you need to connect these modems to the wired or wireless routers in order to share the broadband internet connection with multiple computers in homes. Any home wireless routers can be compatible with these Surfboard cable modems.

To provide optimum data rate throughput between the modem and the router, you should choose wireless gigabit router – wireless routers with gigabit WAN port, because the Surfboard SB6120 and SB6121 include one Gigabit Ethernet port. Most new high speed routers would be better for examples:

  1. Netgear 4700 Storage dual band gigabit router
  2. Netgear 4500 wireless N900 dual band gigabit router
  3. Linksys 4200 N750 dual band gigabit router

Many people make mistakes in connecting these modems to the wireless access point in order to share the Internet and create the wireless network. The wireless access points do not have the NAT function to translate the public IP address to the private IP address and vice versa. To share the internet connection, you need a wireless router to connect to the modem. See also: wireless access point Vs wireless router.

The Surfboard SB6121 is enhanced with 1GHz tuner downstream input to increase the frequency spectrum for demanding bandwidth such as commercial services, interactive gaming and IPTV.

  1. Click here for Surfboard SB6120 spec details and current price in Amazon.
  2. Click here for Surfboard SB6141 spec details and current price in Amazon

Connecting diagram

The following figure shows the networking diagram for home networks using SB6120 DOCSIS 3.0 cable modem and the Linksys E4200 wireless router. Connect the WAN port of the router to the RJ-45 Ethernet port of the modem using the included network cable. You can enjoy the high-speed network with DOCSIS 3.0 modem connecting to the gigabit wireless N router. Enjoy the high-speed online gaming experience and jitter free video streaming with DOCSIS 3.0 modem. Use multiple port Linksys WES610N wireless bridging for connecting home theater devices including HDTV, Blu-Ray and XBOX.

sb6120 cable modem diagram

The new version of Surfboard cable modem is Surfboard SB6141 with DOCSIS 3.0 too, and the all-in-one wireless ac Cable modem by Motorola Arris is Surfboard SBG6872 wireless ac gateway that is designed for replacing the wireless N600 version Surfboard SBG6850 which is selectable band.

TP-link TC-7610

Today TP-link comes to the cable modem market after for years it specialized itself in DSL modem, and its debut in cable modem is TC-7610. It is a DOCSIS 3.0 cable modem with slim and compact design, good looking when you place it in your table.

You can compare with SB6120 and TP-link offers better feature and cheaper. It comes with DOCSIS 3.0 certified and with 8x channel bonding downstream (compared with SB6120 that is only 4x channel bonding)  and 4x upstream. It also comes with Gigabit Ethernet port same as Surfboard.

Click here for TP-link TC-7610 Spec details.

Please note that today cable modem is evolving and the new technology is based on DOCSIS 3.1. See the fastest Netgear CM1000 DOCSIS 3.1 cable modem , speeds up to 1.4Gbps internet downstream. Arris also introduces the same modem – Surfboard SB8200 DOCSIS 3.1 cable modem

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2 Responses

  1. Ted says:

    I don’t understand why the SB6120 claims a maximum of 160Mbps download speed, but has a Gigabit port and Gigabit blue light indicator. Which is the maximum download speed, 160Mbps or 1000Mbps?

    • Ki Gr says:

      Download speed specified is the internet download speed for the cable modem. the 1000 Mbps is the Ethernet port you connect to the gigabit WAN port of the router

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