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Multimedia over Coax Alliance. Sign in to check out Check out as guest. Add to watch list Remove from watch list. Skip to main content. Refer to eBay Return policy for more details. Com21 named their cable modems ComPort. A typical feature of a Com21 network was that the cable modems didn’t get an IP address.

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The remainder of the MHz bandwidth can be used to carry other communication channelssuch as off-the-air TVFMclosed circuit TVor a voice telephone systemor, other digital channels. CDLP was a proprietary system manufactured by Motorola.

Minimum monthly payments are required. On July 15, Com21 went out of business.

The tech guy also told him that ATTBI will likely be offering multiple levels of speed, with higher speeds up to 3 Mbps down costing more dollars. Get the item you ordered or get your money back. Back to dom21 page. A cable modem is a type of network bridge that provides bi-directional data communication via radio frequency channels on a hybrid fibre-coaxial HFC and radio frequency over glass RFoG infrastructure.

Cable Modem Troubleshooting: Com21 DP111

Skip to main content. Later they also introduced a return path multiplexer to overcome modfm problems when combining return path signals from multiple areas. The cable bus consists of two parallel coaxial cables, one inbound and the other outbound. The item may have some signs of cosmetic wear, but is fully operational and functions as intended.



The idea of this module slot was that a cable modem network would also offer a telephone service. Learn more – opens in a new window or tab. The central ComController switch was a modular system offering one downstream channel transmitter and one management module. Interest will be charged to your account from the purchase date if the balance is not paid in full within 6 months.

See other items More Adding to our extensive previous coverage see one and two for example: How do I set it up once I received the item.

Cable Modem Troubleshooting: Com21 DP

This item will ship to United Statesbut the seller has not specified shipping options. If the listing has any confusion, please don’t hesitate to ask prior to purchase Please communicate through Ebay Messages Only The Network Layer Layer 3 is implemented as an IP host in that it has its own IP address used by the network operator to maintain the device.

Be respectful, keep it mmodem and stay on topic. Back to xable page.

The headquarters of the company was located in Milpitas, California. The management module offered a single Ethernet interface to an out of band management cablr. We don’t Reply to Emails Learn more – opens in new window or tab. Contact the seller – opens in a new window or tab and request a shipping method to your location.


Please enter a midem less than or equal to 1. Over the years, Com21 offered several models of their cable modems. Learn More – opens in a new window or tab Any international shipping is paid in part to Pitney Bowes Inc. Mouse over to Zoom – Click to enlarge. Refer to eBay Return policy for more details.

Retrieved from ” https: Watch list is full. Although modwm was the whole point of the DOCSIS project, [14] most cable operators only approve a very restricted list of cable modems on their network, [15] [16] [17] [18] identifying the ‘allowed’ modems by their brand, models, sometimes firmware version and occasionally going as far as imposing a hardware version of the modem, instead of simply allowing a supported DOCSIS version as it should.