Aggregation and Preliminary Calculation of Internet Traffic in Japan

Main points

As of November 2011, overall download traffic from broadband service (see note 4) subscribers in Japan was estimated to be approximately 1.7Tbps (terabits per second) (see note 5), representing an increase by a factor of 1.2 (24.4%) over the past year. Traffic continues to increase.
 
On the other hand, overall upload traffic from broadband service subscribers was estimated to be approximately 669Gbps, showing an ongoing trend of decrease since aggregation in May 2010.
 
Note 1: Six ISPs – Internet Initiative Japan (IIJ), NTT Communications, K-opticom, KDDI, Softbank BB, and Softbank Telecom
Note 2: Five Internet Exchanges – Internet Multifeed, Equinix Japan, Japan Internet Exchange, BBIX and WIDE Project
Note 3: Hiroshi Ezaki (professor at The University of Tokyo), Akira Kato (professor at Keio University), Jiro Nagayoshi (IIJ researcher), Kensuke Fukuda (associate professor at the National Institute of Informatics), and Yuji Sekiya (lecturer at The University of Tokyo)
Note 4: FTTH, DSL, CATV and FWA
Note 5: 1T (tera) (10 to the power of 12) = 1000G (giga)

Related reports and documents

Aggregation and Preliminary Calculation of Internet Traffic in Japan (report published September 30, 2011)