Date: 2022-12-12 Source: Suma Tech

Enactment of C-DOCSIS Standard
As most important and widely deployed next generation broadcasting (NGB) access technology for triple play service over cable TV network, the Chinese standard "NGB broadband access system-Technical specification of C-DOCSIS" (GY T266-2012), which was issued by the National Radio and Television Administration (NRTA) in 2012. As the chair of the NGB C-DOCSIS working group, Mr. Zhifan Sheng organized the NGB C-DOCSIS working group which is consisted of leading cable TV operators such as Topway (Shenzhen), BGCTV (Beijing), WASU (Hangzhou), Guangzhou Cable, Jiangsu Cable, Guangdong Cable, Hefei Cable, Fujian Cable, etc., chip vendors such Broadcom, etc., and equipment vendors such as Huawei, Topvision, Cisco and Motorola to develop C-DOCSIS technology and draft the this standard based on the C-DOCSIS technology being developed.

Fig.1 Relevant organizations, operators and enterprises in C-DOCSIS group

As one of core members in C-DOCSIS working group, Topvision provided some standard text, patents, and prototype. Topvision is a leading company in the deployment of C-DOCSIS and it has a market share of 70% in China. Moreover, Topvision continuously explore the extension of C-DOCSIS application. So far, C-DOCSIS has been widely used in application scenarios such as operators, hotels, government and enterprises.

Evolution of C-DOCSIS
C-DOCSIS is the pioneer of distributed access architecture (DAA) under the system of DOCSIS. This standard is not only widely used in China, but also leading the evolution of the international DOCSIS standards (Fig.2).

Fig.2 Evolution of C-DOCSIS

With the evolution of DAA in C-DOCSIS standard, C-DOCSIS has been introduced into the DOCSIS standard of CableLabs, and then they officially proposed Distributed CCAP Architecture (DCA). Now, the primary technology in cable access is Remote MACPHY based on C-DOCSIS CMC-I, and Remote PHY that based on CMC-III. DOCSIS 4.0 mainly uses these two distributed architectures in practice.

Topvision has been participating in CableLabs C-DOCSIS, Remote PHY (RPD), and Remote MACPHY (FMA) standard groups for a long time, and has served 8 members among the 64 CableLabs MSO members. Topvision has more than 10 years' experience in DAA deployment and has business cases in Japan, USA, Germany, etc. So far, Topvision has provided over 190,000 DAA devices for customers in 20 countries.