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Huawei Cable Solution Improves Bandwidth

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Huawei Cable Solution Improves Bandwidth

Background

Guangzhou Digital Media Group, Ltd. (Guangzhou Media) has taken full advantage of the opportunities brought by advanced IP technology: Cable television, Internet broadband (10 Mbit/s) access, Voice-over-IP (VoIP), and 20 HD channels for interactive TV. The company provides coverage for all of Guangzhou’s urban areas with a fixed broadband network. Guangzhou Media — one of the largest radio and television network operators in southern China — has 2.6 million cable TV subscribers and over 160 thousand broadband users.   

Challenges

Although HD interactive TV and Internet broadband access provide potential new profit growth for Guangzhou Media, these services also require huge bandwidth resources. However, the company’s legacy Cable Modem Termination System (CMTS) networks could not continue to support requirements in terms of bandwidth, cost, equipment rooms, and optical fiber resources. CMTS limited rapid business development and needed to be expanded immediately. 

First, according to the investment analyses, CMTS networks are more suitable for low-bandwidth coverage. When each user’s demand for bandwidth exceeds 10 Mbit/s, CMTS network costs increase dramatically. Since Guangzhou is a highly populated city with high demand for bandwidth, the CMTS network lacked the necessary resources. 

Second, Guangzhou Media’s hub equipment rooms were small, so expanding capacity was difficult. Guangzhou Media needed to find a more flexible expansion solution that required less room.

Third, CMTS networks need pairs of optical fibers to connect to each remote optical station. As the number of optical stations increased, Guangzhou Media needed even more optical fibers. 

Solution

To help Guangzhou Media solve these problems, Huawei proposed a Distributed CMTS (D-CMTS) solution to upgrade the network. With this solution, Optical Line Terminals (OLTs) are deployed in the hub equipment room and CMTS devices, formerly installed in the equipment room, are transferred to remote optical stations. OLTs and CMTS devices are connected through Gigabit Passive Optical Networks (GPON) or Gigabit Ethernet cable. The current Hybrid Fiber Coaxial (HFC) networks, end user cable modems, metropolitan area networks, and service provisioning are not affected. D-CMTS advantages include:

  • Higher bandwidth: D-CMTS can bundle a maximum of 16 downstream channels and four upstream channels, providing 800 Mbit/s downstream and 160 Mbit/s upstream traffic rates. Its coverage range is smaller (200 to 500 households), so each household can have much higher bandwidth.
  • 30 percent lower construction costs: Since data service traffic is distributed by the IP network, the D-CMTS solution reduces the number of CMTS devices, IP QAM modulators, and optical transceivers in the hub equipment room. This reduces equipment space by 70 percent and power consumption by 50 percent. In addition, D-CMTS uses GPON instead of the traditional peer-to-peer optical fiber. By using an optical splitter, four optical stations need only one optical fiber, 80 percent fewer compared to the traditional solution.
  • Service provisioning and maintenance methods remain the same: D-CMTS follows the DOCSIS 3.0 standard, which is compatible with current HFC networks, set-top boxes, and cable modems. For service provisioning, DOCSIS is used. The current operations support system process does not need modification. D-CMTS supports centralized aggregation management of cable modem devices on OLTs. Maintenance personnel need only to manage OLTs, including software upgrades, configuration, and troubleshooting.
  • A foundation for FTTx full-service heterogeneous access: D-CMTS integrates the FTTx network architecture, using FTTO, FTTW, and FTTM to provide unified access of business leased line, Wi-Fi, and mobile base stations. As a result, the D-CMTS network is the most efficient network architecture for developing all services.
  • More subscribers: Guangzhou Media installed the D-CMTS solution in nearby provincial networks where populations are concentrated and provided network coverage for 420,000 users

Benefits

  • Since the HFC network and user terminals are not affected, D-CMTS’ transformation of the legacy network was smooth and totally unnoticed by users
  • D-CMTS improved the signal-to-noise ratio between the network and optical stations by more than 4 dB, and upstream bandwidth was increased
  • Guangzhou Media provides a broadband package of as high as 20 Mbit/s and is about to offer 100 Mbit/s ultra-high broadband access service
  • Subscriptions to the company’s interactive TV service has been increasing by 20 percent monthly, attracting more high-value subscribers and profits

Huawei’s D-CMTS network solved Guangzhou Media’s bandwidth problem. What’s more, successful deployment promoted new service development. Guangzhou Media now provides multiple services such as VoIP, data, IPTV, and interactive HD TV — all of which have improved the company’s profits.

WORLDWIDE