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DOCSIS 3.1 uses channel bandwidths of up to 192 MHz in the downstream. [15] Upstream: DOCSIS 1.0/1.1 specifies channel widths between 200 kHz and 3.2 MHz. DOCSIS 2.0 & 3.0 specify 6.4 MHz, but can use the earlier, narrower channel widths for backward compatibility. DOCSIS 3.1 uses channel bandwidths of up to 96 MHz in the upstream. Modulation:
DOCSIS 3.0 [15] (cable modem) 1216/216 Mbit/s: 152/27 MB/s: 2006 G.fast ITU G.9701: 2000 Mbit/s: 250 MB/s: 2019 GPON (fiber optic service) 2488/1244 Mbit/s: 311/155.5 MB/s: 2008 [16] DOCSIS 3.1 [17] (cable modem) 10/2 Gbit/s: 1.25/0.25 GB/s: 2013 10G-PON (fiber optic service) 10/2.5 Gbit/s: 1.25/0.3125 GB/s: 2012 [18] DOCSIS 4.0 (cable modem ...
Cable modems can have a problem known in industry jargon as "flap" or "flapping". [23] A modem flap is when the connection by the modem to the head-end has been dropped (gone offline) and then comes back online. The time offline or rate of flap is not typically recorded, only the incidence.
The Multimedia over Coax Alliance (MoCA) is an international standards consortium that publishes specifications for networking over coaxial cable.The technology was originally developed to distribute IP television in homes using existing cabling, but is now used as a general-purpose Ethernet link where it is inconvenient or undesirable to replace existing coaxial cable with optical fiber or ...
Cable modem termination system. A cable modem termination system (CMTS, also called a CMTS Edge Router) [1] is a piece of equipment, typically located in a cable company's headend or hubsite, which is used to provide data services, such as cable Internet or Voice over IP, to cable subscribers.
The fiberoptic trunk lines provide enough bandwidth to allow additional bandwidth-intensive services such as cable internet access through DOCSIS. So some or most if not all television channels may be used instead to transmit internet to customers. [3] Bandwidth is shared among users of an HFC. [4] Encryption is used to prevent eavesdropping. [5]
In April 2009, Cogeco implemented a penalty for surpassing the bandwidth limits for each tier. As of August 2021, Cogeco offers up to gigabit download speeds (30 Mbit/s upload) in certain areas which takes advantage of its DOCSIS 3.1 platform upgrades and 180 Mbit/s download (10 Mbit/s upload) most of its footprint on DOCSIS 3.0.
In addition, there is a basic layer-3 aggregation [20] that allows servers with multiple IP interfaces on the same network to perform load balancing, and for home users with more than one internet connection, to increase connection speed by sharing the load on all interfaces. [21]