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Centre for Telecommunication Research is a research-based institute at the Sri Lanka Technological Campus (SLTC) to carry out innovative, collaborative and industry-sponsored research works in wireless communications and networking. Research activities at the CTR, both fundamental and applied, mainly focus on technologies related to the ...
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:
A given headend may have between 1–12 CMTSs to service the cable modem population served by that headend or HFC hub. One way to think of a CMTS is to imagine a router with Ethernet interfaces (connections) on one side and coaxial cable RF interfaces on the other side. The Ethernet side is known as the Network Side Interface or NSI. [3] [4]
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 ...
The PacketCable effort dates back to 1997 when cable operators identified the need for a real-time multimedia architecture to support the delivery of advanced multimedia services over the DOCSIS architecture. The original PacketCable specifications were based on the physical network characteristics of operators in the U.S.
Comcast's business Internet plans are similar to their residential plans, with slightly different speed offerings and prices. Notably, the main difference between Comcast's residential Internet and Business Internet is the lack of a monthly data cap with the business plans. [49]
A cable modem that is unable to acquire an upstream channel will give up and resume scanning for new channels. Likewise, persistent upstream errors will cause a cable modem to "reinitialize its MAC" and scan for new downstream channels. This behavior is appropriate for traditional cable modems, but not for cable set-top boxes.
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