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Data Over Cable Service Interface Specifications (DOCSIS) is an international standard developed by CableLabs and contributing companies that include: ARRIS, BigBand Networks, Broadcom, Cisco, Conexant, Correlant, Intel, Motorola, Netgear, Terayon, and Texas Instruments. DOCSIS defines the communications and operation support interface requirements for a data over cable system. It permits the addition of high-speed data transfer to an existing Cable TV (CATV) system. It is employed by many cable television operators to provide Internet access (see cable internet) over their existing hybrid fibre coaxial (HFC) infrastructure. The first DOCSIS specification was version 1.0, issued in March of 1997, with revision 1.1 (adding Quality of Service (QoS) capabilities) following in April of 1999. Because of increased demand for symmetric services such as IP telephony, DOCSIS was revised to enhance upstream transmission speeds; DOCSIS 2.0 was released in December 2001. Most recently, the specification was revised to significantly increase transmissions speeds (this time both upstream and downstream) and introduce support for Internet Protocol version 6 (IPv6). This version, DOCSIS 3.0, was released in August 2006. Cross-version compatibility has been maintained across all versions of DOCSIS, with the devices falling back to the highest supported version in common between both endpoints (cable modem and cable modem termination system).
As frequency allocation band plans differ between U.S. and European CATV systems, DOCSIS standards have been modified for use in Europe. These changes were published under the name of "EuroDOCSIS". The main differences account for differing TV channel bandwidths; European cable channels conform to PAL TV standards and are 8 MHz wide, whereas in North-America cable channels conform to NTSC standards which specify 6 MHz. The wider bandwidth in EuroDOCSIS architectures permits more bandwidth to be allocated to the downstream data path (toward the user). EuroDOCSIS certification testing is executed by Excentis (formerly known as tComLabs), while DOCSIS certification testing is executed by CableLabs. Typically, CPE gear receives "Certification", while CMTS equipment receives "Qualification".
Japan employs other variants of DOCSIS.
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The International Telecommunications Union Telecommunications Standardization Sector (ITU-T) has approved the various versions of DOCSIS as international standards. DOCSIS 1.0 was ratified as ITU-T Recommendation J.112 Annex B (1998), but it was superseded by DOCSIS 1.1 which was ratified as ITU-T Recommendation J.112 Annex B (2001). Subsequently, DOCSIS 2.0 was ratified as ITU-T Recommendation J.122. Most recently, DOCSIS 3.0 was ratified as ITU-T Recommendation J.222 (J.222.1J.222.2J.222.3).
Note: While ITU-T Recommendation J.112 Annex B corresponds to DOCSIS/EuroDOCSIS 1.1, Annex A describes an earlier European cable modem system ("DVB EuroModem") based on ATM transmission standards. Annex C describes a variant of DOCSIS 1.1 that is designed to operate in Japanese cable systems. The ITU-T Recommendation J.122 main body corresponds to DOCSIS 2.0, J.122 Annex F corresponds to EuroDOCSIS 2.0, and J.122 Annex J describes the Japanese variant of DOCSIS 2.0 (analogous to Annex C of J.112).
DOCSIS provides great variety in options available at Open Systems Interconnection (OSI) layers 1 and 2, the Physical (PHY) and Media Access Control (MAC) layers.
DOCSIS 3.0 features management over IPv6 and channel bonding, which enables multiple downstream and upstream channels to be used together at the same time by a single subscriber. [1]
Maximum synchronization speed (Maximum usable speed)
| Version | DOCSIS | EuroDOCSIS | ||
|---|---|---|---|---|
| Downstream | Upstream | Downstream | Upstream | |
| 1.x | 42.88 (38) Mbit/s | 10.24 (9) Mbit/s | 55.62 (50) Mbit/s | 10.24 (9) Mbit/s |
| 2.0 | 42.88 (38) Mbit/s | 30.72 (27) Mbit/s | 55.62 (50) Mbit/s | 30.72 (27) Mbit/s |
| 3.0 4channel | +171.52 (+152) Mbit/s | +122.88 (+108) Mbit/s | +222.48 (+200) Mbit/s | +122.88 (+108) Mbit/s |
| 3.0 8channel | +343.04 (+304) Mbit/s | +122.88 (+108) Mbit/s | +444.96 (+400) Mbit/s | +122.88 (+108) Mbit/s |
A DOCSIS architecture includes two primary components: a cable modem (CM) located at the customer premises, and a cable modem termination system (CMTS) located at the CATV headend.
A typical CMTS is a device which hosts downstream and upstream ports (it is functionally similar to the DSLAM used in DSL systems). While downstream and upstream communications travel on a shared coax line in the customer premises, and connect to a single F connector on the cable modem, it is typical for the CMTS to have separate F-connectors for downstream and for upstream communication. This allows flexibility for the cable operator. Because of the noise in the return (upstream) path, an upstream port is usually connected to a single neighborhood (fiber node), whereas a downstream port is usually shared across a small number of neighborhoods. Thus, there are generally more upstream ports than downstream ports on a CMTS. Typical ratios of downstream to upstream ports are: 1:4 & 1:6.
Before a cable company can deploy DOCSIS 1.1 or above, it must upgrade its Hybrid fibre-coaxial (HFC) network to support a return path for upstream traffic. Without a return path, the old DOCSIS 1.0 standard still allows use of data over cable system, by implementing the return path over regular phone lines, e.g. "plain old telephone service" (POTS). If the HFC is already \'two-way\' or \'interactive\', chances are high that DOCSIS 1.1 or higher can be implemented.
The customer PC and associated peripherals are termed Customer-premises equipment (CPE). The CPE are connected to the cable modem, which is in turn connected through the HFC network to the CMTS. The CMTS then routes traffic between the HFC and the Internet. Using the CMTS, the cable operator (or Multiple Service Operators - MSO) exercises full control over the cable modem\'s configuration; the CM configuration is changed to adjust for varying line conditions and customer service requirements.
DOCSIS includes MAC layer security services in its Baseline Privacy Interface specifications. DOCSIS 1.0 utilized the initial Baseline Privacy Interface (BPI) specification. BPI was later improved with the release of the Baseline Privacy Interface Plus (BPI+) specification used by DOCSIS 1.1 & 2.0. Most recently, a number of enhancements to the Baseline Privacy Interface were added as part of DOCSIS 3.0, and the specification was renamed "Security" (SEC).
The intent of the BPI/SEC specifications is to describe MAC layer security services for DOCSIS CMTS to CM communications. BPI/SEC security goals are twofold:
BPI/SEC is intended to provide a level of data privacy across the shared medium cable network equal to or better than that provided by dedicated line network access services (analog modem or digital subscriber line). It does this by encrypting data flows between the CMTS and the CM. BPI & BPI+ utilize 56-bit DES encryption, while SEC adds support for 128-bit AES. All versions provide for periodic key refreshes (at a period configured by the network operator) in order to increase the level of protection.
The earlier BPI specification [ANSI/SCTE 22-2] had limited service protection because the underlying Key management protocol did not authenticate cable modems. BPI+ strengthened the service protection feature by adding digital certificate based authentication with a public key infrastructure to its Key exchange protocol.
This article is licensed under the GNU Free Documentation License. It uses material from Wikipedia
