Technologies
to enhance
networks
D－13
Modularization of access network elements
Flexible customization to satisfy various requirements on
access networks
NTT Laboratories are developing the flexible access system architecture (FASA). FASA is flexibly customized to meet various
service requirements (e.g., higher bandwidth efficiency, lower latency, and higher reliability) on access networks.
Features
Software modules
Protection
application
*3
Bandwidth DoS attack
prevention
control
application application
OAM*2
application
Modules replacement to
satisfy requirements
OLT*1
Multicast
application
Common
■ Modularization of network functions on access network elements
as software modules and external hardware modules.
Maintenance
and operation
application
Encryption
application
Bandwidth
control
application
APIs*4
General-purpose functions
(software)
■ Support of various service requirements/transmission schemes on
the same hardware by replacing software modules with common
APIs, external hardware modules, and software modules inside
general-purpose functions.
Wireless
parent stations
Co-operations
(wireless resource
information)
Core
network
elements
General-purpose hardware
Grants for ONU*5 transmission
External hardware
modules
ONU ONU
Control signals MC*6
Data signals
Radio stations
*1 OLT: optical line terminal, *2 OAM: operations, administration and maintenance,
*3 DoS: denial of service, *4 API: application programming interface,
*5 ONU: optical network unit, *6 MC: media converter
■ Reductions of time and cost of new developments by reusing
modules with open common APIs between different systems.
User equipment
Application Scenarios
■ Flexible and quick responses to future changes in standardizing
specifications of services to be transmitted on access network
elements by replacing or adding on modules.
■ Small starts and reduced initial facility construction cost by
accommodating services with different service requirements (e.g.,
residential and enterprise services) on the same hardware by
replacing or adding on modules.
■ Higher performances (e.g., low latency) optical access systems by
using add-on functions communicating with external equipment
(e.g., wireless parent stations).
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