The early models of the modems also offered a hidden interface providing a 4-wire serial communication interface for debugging or monitoring purposes. The PSTN-based service was considered ‘one-way cable’ and had many of the same drawbacks as satellite Internet service; as a result, it quickly gave way to “two-way cable. A ComController needed at least one upstream receiver module. Please enter 5 or 9 numbers for the ZIP Code. This amount is subject to change until you make payment.

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To connect the cable modem network to the Internet, a ComController had one or more network modules. Subject to credit approval. Minimum monthly payments are required.

Com21 was an early pioneer in developing cable modem networks in the era before the standard DOCSIS was introduced for Internet access via cable television networks. Learn More – opens in a new window or tab Any international shipping and import charges are paid in part to Pitney Bowes Inc.

For additional information, see the Global Shipping Program terms and conditions – opens in a new window or tab This amount includes applicable customs moddm, taxes, brokerage and other fees. The tech guy also told him that ATTBI will likely be cab,e multiple levels of speed, with higher speeds up to 3 Mbps down costing more dollars.


The word broadband as used in the original IEEE Delivery times may vary, especially during peak periods.

See other items More Space-division Frequency-division Time-division Polarization-division Orbital angular-momentum Code-division. All goods are sold in good faith and as a responsible seller we have the ability to resolve any issue with in reasons Please communicate through eBay Messages Only.

All ComPort modems offered two interfaces: You can call your service provider and inquire about the support of this modem on their Network.

An item that has been used previously. The Com21 portfolio can be divided into three segments: In other projects Wikimedia Commons. In the late s, a consortium of US cable operatorsknown as “MCNS” formed to quickly develop an open and interoperable cable modem specification.

Cable modem – Wikipedia

Add to watch list Remove from watch list. This means the item has been inspected, cleaned, and repaired to full working order and is in excellent condition.

Similar cable-bus systems are in operation at a number of government sites, e. Ships from United States. Broadband Local Area Networks”. Special financing available Select PayPal Credit at checkout to have the option to pay over time.


Cable Modem Troubleshooting: Com21 DP1110

Hybrid’s system architecture is used for most cable modem systems today. Over the years, Com21 offered several models mosem their cable modems. The networks using the Com21 system passed 15 million households worldwide. Please enter 5 or 9 numbers for the ZIP Code. Hybrid Networks developed, demonstrated and patented the first high-speed, asymmetrical cable modem system in Other offers may also be available.

All you need to do is provide them with the Make and the Model from this listing OR 2. The inbound cable and outbound cable are connected at one end, the headendand electrically terminated at their other ends.

Cable modem service miscellany: COM21; Prxoy settings; Comcast change

Please enter a number less than or equal to 1. Get the item you ordered or get your money back. This item will ship to United Statesbut the seller has not specified shipping options. This item may be a floor cmo21 or store return that has been used.