With structural changes from SINET3, SINET4 has achieved higher network speed, the provision of diverse services, and more stable edge nodes.
Structural change from SINET3 to SINET4
1. Higher network speed
The effective network bandwidth has been increased and the rerouting function has been improved by reconfiguring the network and adopting solutions including dark fiber and WDM technology. This has made the network even more cost effective.
Core line (between core nodes)
Made redundant based on 40Gbps
Edge line (between edge nodes and core nodes)
2.4Gbpsー40Gbps
Access line (between institutions in sites and edge nodes)
10Gbpsー40Gbps
Access line (between member institutions and edge nodes)
1Gbpsー40Gbps
(*In the case of a participation in the
access line joint procurement)
Higher speeds achieved economically by dark fiber and WDM technology
2. Provision of diverse services
SINET4 inherits all of SINET3ʼs services, with services such as resource-on-demand strengthened and expanded.
3. Higher edge node stability
SINET4 positions both edge nodes and core nodes in data centers, improving the reliability of the network including its availability, maintainability, and security.
[Criteria for data center selection] (Abstract)
- There is no interruption to power supply due to planned outages.
- In the case of an outage, power can be supplied from emergency power supply system for at least ten hours in a row.
- It is capable of enduring an earthquake equivalent in intensity to the Great Hanshin Awaji Earthquake.
- Access securely controlled 24 hours a day, 365 days a year.
Shift of edge nodes (From node universities to data centers)
4. Establishment of an environment for high-speed access lines
By undertaking shared procurement of access lines, a faster access system has been created for member institutions other than those on site (SINET3 node universities).
In addition, installment of nodes is scheduled to be completed within FY2011 in all prefectures in Japan.
5. Upper layer deployment
Installation of interfaces and service-providing platforms to support the upper layer is being considered.
