DOCSIS: Wired Cable Data Service Interface Specification - Network Code

xiaoxiao2021-03-06  43

Cable Cable Data Service Interface Specification (DOCSIS) is an interface requirement for cable modem, including high-speed distribution data (MPEG and IP data) on cable TV system network, which is launched by Cablelabs and certified by ITU license. Other devices that identify and support DOCSIS standards also include HDTVS and activation web set top boxes of ordinary televisions.

There are two main components of the DOCSIS system: Cable Modem (CM) - is located in user premise; cable modem header system (CMTS) - is located at the front of the service provider and is used to aggregate traffic on multiple-channel cable modems. Then communicate with the central network. DOCSIS provides modulation mode and two-way signaling exchange protocols between the two components described above.

Currently, DOCSIS is implemented and configured with three versions:

DOCSIS 1.0 - Supports high-speed access to the Internet. Main features: 50 MHz to 750 MHz Radio Frequency (RF) path on the row of downstream traffic transmission rates between 27 Mbps and 36 Mbps; 5MHz to 42 MHz RF paths on the upstream traffic transmission rate value on the RF path 320 kbps and 10 mbps (mean are 5 Mbps). However, since the data transfer on the cable cable uses a shared ring, with the increase of access users, the transmission rate of the personal user will decrease accordingly. DOCSIS 1.1 - Support data, voice, stream control, and setup request policies. Main features: DOCSIS1.1 can operate with DOCSIS1.0; it enhances multiple services such as voice and stream control QoS, and improves security and powerful uplink data transmission based on DOCSIS 1.0 (average 10 Mbps) capabilities.

For more information, please visit the following page: 中文 版: http://www.networkDictionary.com/chinese/protocols/docsis.php: http://www.networkDictionary.com/protocols/docsis.php

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