A new design of a telco central office.

1. CENTRAL OFFICE
REARCHITECTED
AS A DATA CENTER
AUTH:
LARRY PETERSON, ALI AL-SHABIBI, TOM ANSHUTZ, SCOTT BAKER, ANDY BAVIER, SAURAV DAS, JONATHAN
HART, GURU PALUKAR, AND WILLIAM SNOW
SOURCE:
IEEE 2016 COMMUNICATIONS MAGAZINE
SPEAKER:
MENG-ZE LI
ADVISORY:
HUNG MENG CHEN

2. OUTLINE
• Introduction
• Challenges
• Related work
• Architecture
• Method
• Conclusion

3. INTRODUCTION
• Ａ new design of a telco central office.
• Replaces closed and proprietary hardware with software .
• Running on commodity servers, switches, and access devices.
• Network operators to benefit from both the economies of
scale and agility.

4. CHALLENGES
• Network operators face significant challenges
• Contains a diverse collection of purpose-built devices,
assembled over 50 years,
• In response, network operators are looking for ways to
benefit from both the economies
• Scale
• Agility

5. RELATED WORK(1/3)
• Software-Defined Networking
• SDN technology is a novel approach to cloud computing.
• Facilitates network management.
• Enables programmatically efficient network configuration.
• improve network performance and monitoring.

6. RELATED WORK(2/3)
• OpenFlow
• OpenFlow allows switches from different vendors.
• Enables network controllers to determine the path of
network packets across a network of switches.

7. RELATED WORK(3/3)
• Network functions virtualization
• A network architecture concept
• Uses the technologies of IT virtualization to virtualize entire
classes of network node functions

8. ARCHITECTURE（1/4）
• Servers:
• QUANTA STRATOSS210-X12RS-IU servers
• 128 GB of RAM
• 2 X300 GB HDDs
• 40GE dual-port NIC
• Switches:
• OpenFlow-enabled Accton 6712 switches
• 32 X40GE ports
• • I/O Blades:
• AT&T Open GPON — NFV OLT Line Card.
• merchant silicon OLT MAC chips from Microsemi

9. ARCHITECTURE(2/4)

10. ARCHITECTURE(3/4)
• Given this hardware/software foundation, transforming today’s
Central Office into Central Office ReArchitected as a Data
Center is a two-step process.
• The first step is to disaggregate and virtualize the devices
• turn each purpose-built hardware device into its software
counterpart running on commodity hardware.
• The second step is to provide a framework into which the
resulting disaggregated elements can be plugged
• software elements into a scalable and agile system.

11. ARCHITECTURE(4/4)
• customer premises equipment (CPE)
• Separate customer equipment from the equipment located in central office of the communications
service provider.
• optical line termination (OLT)
• A device which serves as the service provider endpoint of a passive optical network
• broadband network gateway (BNG)
• Sits at the edge of an ISP's core network, and aggregates user sessions from the access network.

12. METHOD(1/6)
• Virtualizing the OLT
• each physical termination point aggregating a set of subscriber connections.
• includes the merchant silicon GPON MAC chips under control of a remote control
program via OpenFlow.
• under the same SDN-based control paradigm
• The resulting control program, called virtual OLT (vOLT)

13. METHOD(2/6)
• Virtualizing the CPE
• including both the GPON-terminating ONT and also a “home router” or
“residential gateway,” is installed in the customer’s premises.
• new value-added services as well as customer care capabilities can be provided
where they could not before because of limitations in the hardware.
• virtualized version of CPE, called virtual subscriber gateway (vSG),

14. METHOD(/6)
• Virtualizing the BNG
• one of the more complex and expensive devices in a Central Office
• virtualized BNG, called a virtual router (vRouter)
• vRouter as providing each subscriber with their own “private virtual router,”

15. METHOD(4/6)
• Service Framework
software counterparts must also be managed as a
collective
approach is to adopt everything as a service (XaaS) as a
unifying principle .

16. METHOD(5/6)
• ONOS
network operating system that manages both software switches and the physical switching fabric.
• XOS
a framework for assembling and composing services.
• OpenStack
cluster management suite
• Docker
provides a container-based means to deploy and interconnect services.

17. METHOD(6/6)

18. CONCLUSION
Central Office Re-Architected as a Data Center is a
revolutionary effort to transform legacy central offices in the
telco network.
In the re-architected Central Office, closed and proprietary
hardware is replaced with software running on commodity
servers and switches.