Who invented docsis

The CMTS network interface connects to a switch which provides a connection to the Internet via a network of fiber-optic cable and routers that connect to Internet servers all over the world. The fiber-optic network may be owned by the cable operator or owned by a contracted Internet service provider ISP. The switch also provides a connection to a local content server, and the public switched telephone network PSTN for telephone service.

If the network meets or exceeds these recommendations, operators can expect reliable data transmission. When choosing the installation location for a DOCSIS modem, what should you consider to ensure continuous and reliable operation? To ensure continuous and reliable operation, the DOCSIS modem should have adequate air-flow across it and be plugged into a non-switched AC power outlet. Why should an already installed cable service drop be inspected as part of any installation and service call?

Installation standards change, so what might have been a good installation at the time could be out of compliance today. Therefore, the entire drop system must be checked to ensure safety, technical, and company compliance during every installation and service call.

But this competitive threat, however strong, did not bring demise to the well-founded yet significantly older technology. It was the DOCSIS standard that turned out to be the stepping stone which coaxial cable technology needed to stay in the game and enable an ever-faster Internet access while avoiding the Herculean and extremely costly task of replacing the whole physical network infrastructure.

Thus, along with the rapidly evolving data transfer technology, DOCSIS has gone through a great deal of improvements and modifications since its inception back in Let us make a brief dash through the long history of this persistent and durable solution. Devoted to the implementation of typical services related to Internet access, D1.

Soon to be upgraded to version D1. The standard, complemented with elements of QoS Quality of Service , began to meet the extended security requirements for DES 56 data transmission, including the use of filtration and transmission encryption. The maximum speeds achieved in this version were accordingly: 40 Mbps download and up to 30 Mbps upload. This was made possible by making a wider band available in the upstream direction e.

The 3. In the upstream direction the possible speed is about Mbps. Since its release, D3. Speaking of HFC, it is important to mention insofar that the implementation of the DOCSIS standard and its subsequent modifications have acted as a catalyst for the development of HFC technology which keeps playing an important part of the market and of the telecommunications industry. The HFC Hybrid Fiber-Coax network topology consists of an infrastructure of coaxial cables connected to an optical node that provides electric-to-optical conversion.

Optical nodes, connected to a central location by means of fiber, usually power an amplifier connected to the coaxial cable. The D3. The 6 or 8 MHz channel widths featured in previous iterations have been replaced by narrower 25 kHz or 50 kHz wide orthogonal frequency-division multiplexing OFDM subcarriers, which combined form a block spectrum as wide as MHz. The development of separate standards for the US and Europe in case of versions before D3.

Their center frequencies top at MHz but require frequency hops of only 6 MHz. I was talking to my gaming friends online. Verizon, I beat you to it. I also kept saying it.

Communication during the multi-player game of Tribes was the key to success. While the first recorded cable modem trial was performed by MITRE Cablenet in , it was really just a science experiment, but did reach speed of The challenge for cable operators is that if you bought a CMTS from one of these vendors you also were required to purchase all of your modems from them as well.

This is because they were proprietary systems non-standards-based. To cable operators and the cable industry this meant we could buy CMTSs from one vendor and modems from another — this resulted in competition, lower costs and innovation.

Further, the specification enabled up to 37 Mbps net throughput in the downstream and 8 Mbps net in the upstream. Cable modems were always on, so dialing up was no longer necessary and the modems did not tie up existing phone lines. The speed was unprecedented and always-on modem capability meant that a user could walk up to their computer and instantly access the Internet.

It was amazing! Suddenly we went from video only content providers to providers of the Internet too. What if cable networks were not capable of distributing data?

While a rhetorical question, it shutters one to think of the consequences. For many cable operators today a significant percentage of their revenue is derived directly from DOCSIS data subscribers.

While video was the technology that built the cable industry, data is what drives it. Also, what if we only had to rely on DSL and dial-up. Innovation would have been slow and so would be your Internet speeds. Remember the timing. This was huge. If only cable operators could compete directly against telecom operators in the telephony space this would be something called The Triple Play.

Cable operators would be able to sell video, data and voice directly to their subscribers, something never before possible in the history of cable. The game was on and has never ceased since. It earned its place in history. Also, when you see that your cable modems are registered as DOC1. It means they are ready to support the highest level of quality of service that our DOCSIS networks currently provide.

This next release packed in a lot of features focused on the upstream. Specifically, the specification increased the maximum upstream transmit speed from 8 Mbps net to 27 Mbps net — over a 3x increase! Additionally it added a number of enhancements for combating upstream impairments such as ingress cancellation, dynamic interleaving for impulse noise and S-CDMA.