Driven by market evolution towards triple-play services, cable operators in emerging markets are seeking standardized and digital fiber-based solutions for economical and future proof access technologies. Much of the demand is driven by the need to provide higher bandwidth packet transport for Internet connectivity, video and voice services. DOCSIS® is known as a standardized technology for services over cable and thus has strong interoperability between system providers and robust Quality of Service (QoS) methods, ensuring packet delivery during periods of network congestion. Traditionally, DOCSIS runs on linear fiber (or HFC) to provide service and is not naturally applicable for digital fiber. However, Cisco has bridged the gap by inventing a new access technology called Cisco Remote-PHY.
Cisco Remote-PHY (a.k.a REMOTE-PHY) enables cable operators to deploy DOCSIS-based networks over digital fiber while obtaining all of the benefits of using standards-based equipments. These benefits include the utilization of scalable, cheap and easy to operate digital fiber, standardized and proven QoS for various services, lower cost, and wide availability of both cable modem and set-top box systems. Furthermore, with deep fiber, the optical noise contribution to SNR is eliminated. As a result, the remote QAM modulator runs at higher orders of modulation as compared to a centralized QAM modulator. Cisco Remote-PHY is apt where digital deep fiber is preferred.
This document presents an overview of using Cisco Remote-PHY as a solution for digital fiber and DOCSIS pursued cable operators. It provides a cost-effective digital fiber-based DOCSIS solution that uses Ethernet PON (EPON), Gigabit-capable Passive Optical Networks (GPON), or Metro Ethernet (MetroE) as transmission network between the CMTS and CM, which gives customers an optimal option to utilize the Passive Optical Network (PON) technology and DOCSIS in the same network.
Cisco IOS Release 12.2(33)CX is generally available for field deployment. However, we recommend that you validate and qualify Cisco IOS Release 12.2(33)CX in a limited field trial with your specific network configuration requirements in order to ensure a smoother, faster, and successful field deployment.
This chapter includes the following sections: