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Zoom Cable Modem, 8X4, Model 5341J, 343 Mbps DOCSIS 3.0 Certified by Comcast XFINITY, Time Warner Cable, Cox, Bright House, Cable One and More

4.6 out of 5 stars 1,548 customer reviews
| 207 answered questions

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  • Fast Internet! Up to 343 Mbps downstream and 143 Mbps upstream. Fast Ethernet port! 10/100/1000 Mbps Ethernet port connects to your Windows or Macintosh computer, router, wireless access point, HomePlug adapter, or other Ethernet-enabled device. This is MODEM ONLY
  • Supports all popular DOCSIS cable modem standards - 3.0, 2.0, and 1.1. Tested and certified by CableLabs ® to work with nearly all U.S. cable service providers including Comcast, Cox, Time Warner Cable, Brighthouse and Cable ONE.
  • Includes advanced networking capability including IPv4 and IPv6 for powerful, flexible network addressing.
  • Includes energy-saving switching power cube, Ethernet cable, modem stand, and Quick Start flyer.
  • Small, attractive cable modem can lie flat or stand up using the stand provided.
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Product Description

The Zoom Model 5341J cable modem meets the cable industry's DOCSIS 3.0 standard for speeds up to 343 Mbps, and also works with lower-speed DOCSIS 2.0 and 1.1 services. And with IPv4 and IPv6 networking support, this is a product designed and built for use today and for years to come. The Model 5341J has been tested and certified by CableLabs ® to work with nearly all U.S. cable service providers including Comcast, Cox, Time Warner Cable, and Cable ONE. The fast 10/100/1000 Mbps Ethernet port connects to your Windows or Macintosh computer, router, wireless access point, HomePlug adapter, or other Ethernet-enabled device The Model 5341J can also be plugged into routers and routers with wireless capability for sharing of your high-speed service with multiple devices. With its easy installation, high speed, and broad capability, the Model 5341J is the perfect choice for almost any cable modem user.

Product Information

Technical Details

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Brand Name Zoom
Item model number 5341-00-00J
Item Weight 9.3 ounces
Product Dimensions 4.9 x 1.3 x 6.3 inches
Item Dimensions L x W x H 4.9 x 1.3 x 6.3 inches
Color Black
Voltage 12 volts

Technical Specification

Warranty [pdf ]

Additional Information

ASIN B0063K4NN6
Customer Reviews
4.6 out of 5 stars 1,548 customer reviews

4.6 out of 5 stars
Best Sellers Rank #3,171 in Computers & Accessories (See top 100)
#110 in Computers & Accessories > Networking Products > Modems
Shipping Weight 1.3 pounds
Date First Available November 4, 2011

Warranty & Support

Warranty, Parts:two years from date of purchaseWarranty, Labor:two years from date of purchaseAmazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
Product Warranty: For warranty information about this product, please click here [PDF ]

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Customer Reviews

Top Customer Reviews

Verified Purchase
I used this to replace an old Docsis 2.0 Motorola SBG900.

The SBG900 worked well enough until I purchased a Logitech Revue, which has issues with the SBG900, such as dropping connections which required a reboot of the router, among other things.

After doing my research, I found that the Zoom 5341J was Comcast compatible and capable of connecting to 8 download channels and 4 upload channels, compared to the much more common 4Down x 4Up configuration. Keep in mind that the Zoom 5341(with no J at the end) is a 4x4 configuration.

The Zoom 5341 is a modem only, not having a wireless router embedded like the SBG900, but I already had a Linksys WRT54G router, which I had already pulled out to try and rectify my problems with the Logitech Revue. The SBG900 kept dropping the wired connection to the Linksys though... The Zoom 5350 is compatible with Comcast and has the same specs as the 5341J, but also has a wireless router and 4 wired ports as well. I considered it, but decided to go with seperate pieces for modem and router duty.

The evening that the Zoom 5341J arrived, I installed it in place of the SBG900, and plugged my laptop in. Once it had established a connection, the Comcast device activation page came up in my browser, and I was able to switch the activation from the SBG900 to the Zoom 5341J in minutes, with no need for phone calls to support.

The configuration of the Zoom 5341J is very simple, and I made no changes to the default configuration. I did check the connections, and found that I had 8 download connections and 2 upload connections. It appears that Comcast in my area will only provide 2 upload connections.

I plugged the Linksys WRT54G in and had WiFi a minute later.
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Verified Purchase
While looking to rid myself of Comcast's rental (which I had shamefully paid for so many years), I read reviews here and decided on 5341J. All DOCSIS 3.0 models are priced similarly, but this one has that little advantage of potentially bonding 8 channels downstream instead of the normal 4. (Not that Comcast will allow you without your arm and leg.) Besides, the Cisco/Linksys model that I was actually looking to buy was too unproven, and Motorola's was, eh, SurfBored. But the deciding factor is the overwhelmingly positive experience shared here. The same positive experience that I am going to share.

So I got my Zoom, hooked the cables up, and ventured to the Web. Initially, Comcast's self-service activation had a problem (that the machine could not define) with my unit even though all lights were up correctly. Dreading to stay on the phone listening to elevator music, I opted to "Chat with an online expert." (Via the very modem connection.)

The agent asked me to read the MAC address even though their system should able to identify based on the chatting session, and added this unit to my account. (See the package picture for how to locate it.) Then told me that "I sent it a signal but it cannot receive." The "advice" for me? "Find a replacement device." Really? I had already viewed my unit's status Web page and determined that the device was working perfectly. I insisted to try again. Comcast - or the agent - failed again. Anywhere I browse landed on Comcast's activation page. "Find a replacement device." I gently suggested that the device couldn't possibly be defective because I was able to ping any Internet server (beside the fact that the very device was used in the chat). "I understand. But my advice is for you to find a replacement device.
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Verified Purchase
I had opportunity to test two different cable modems on Comcast business service. One was Motorola SB6121 and the other Zoom 5341. Both are DOCSIS 3.0, which is required for high speed cable service. Comcast tech support was not thrilled about Zoom while they praised Motorola SurfBoard high. As it turned out, average Comcast technician, who suppose to activate the modem, has a trouble with the Zoom serial number.
My configuration of Comcast service in this case is 2 times 50 Mb/s download and 10 Mb/s upload speed. This service supposes to supply over 1000 users with Internet access, load balance mode. First line was activated with Zoom modem and everything went well for several days. To the second line I attached Motorola modem; Comcast managed to deactivate Zoom modem on the first line in process, though. Initial test of Motorola showed expected values in download and upload speeds. However, with network connected to it, Motorola download speed didn't reach more than 10 Mb/s download with upload of 2 Mb/s. After 24 hours of 1000 people complaining, Comcast Technician came to check the installation and re-activate Zoom modem. Test of Motorola modem with a single laptop connected didn't show any abnormality: Download and upload speed were at nominal values. Since I couldn't put in place my load balancer yet, I switched the network to the Zoom modem and made 1000 surfers happy again. In a couple of days my load balance configuration should go live, using one Motorola and one Zoom modem. I intend to update this review with the result of Motorola performance in this configuration, for potential buyers interested in the Motorola SB6121.
Well, I decided to buy Comcast Internet service for home and I didn't have dilemma which modem to chose; Zoom it is.
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