If a software-defined CPE is deployed, the operator can evolve its guest access network through software upgrade. In the non-SDN phase, the CPE is configured as a legacy PTN or IP RAN device. When SDN is required, the CPE is upgraded to a device that supports OpenFlow. In the future, you can continue to upgrade to vCPE that supports NFV.

To implement a software-defined CPE, the most ideal solution is an SDN-friendly access network processor. Why do you say this way? The network processor has excellent flexibility and programmability, can be differentiated design, and can be upgraded in the field. The processor for the software-defined CPE must be designed specifically for the access network. Its functionality, performance, power consumption and cost must be balanced and optimized from the perspective of the access network. The architecture of the processor must be SDN-friendly, meaning that the data flow's operational flow requires not only high flexibility, but also as close as possible to OpenFlow's pipeline operations.

PMC's WinPath access network processor is ideal for implementing software-defined CPE. This is due to some of the features of its architecture:

The basic processing unit consisting of a programmable search engine and a network processor engine emulates the "match"-"action" structure of the OpenFlow switch.

Programmable search engine for search accelerators, support for multi-level lookups and multi-type lookups

Network processor engine uses advanced symmetric multi-core, multi-threaded architecture to support hardware arbitration and load balancing

Support loopback and iteration of basic processing units, flexible implementation of complex forwarding process design

Pipeline restrictions for hard-coded, specific functions

How to implement software defined CPE?

From the perspective of longer-term planning, operators hope to virtualize network functions, replace the current enterprise IT gateways or routers with cloud servers, and replace the original IT services. There is no need to equip IT departments within the enterprise. To enable enterprises to trust the managed IT to the operator, the software-defined CPE must have a security engine to do various encryption functions, and ensure that CPE can support network virtual functions in the future. These functions can be implemented through PMC's WinPath access network processor.

PMC believes that implementing SDN in the guest access network will maximize the advantages of SDN, and it will bring more profit to operators by opening more services. Adopting SDN technology requires the support of innovative hardware, and implementing a software-defined CPE access device through a programmable network processor is currently the best choice.

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