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HOME  >  ANSL R&D Times  >  No.38_1 (2004_04)  >  NTT quickly provides economical IP services using optical and wireless technologies!
ANSL R&D Times

NTT quickly provides economical IP services using optical and wireless technologies!

Figure 1 shows a service image of WIPAS. This system provides a best-effort and minimum bandwidth guarantee type IP service, and the wireless bandwidth is shared fairly among the WTs that are connected to the same AP. This system uses quasi-millimeter-waves in the 26 GHz band, and the maximum wireless transmission rate of this system is 80 Mbit/s. The wireless transmission rate can be changed adaptively depending on the quality of the wireless circuit. The maximum transmission distance is approximately 1.7 Km (*).
Access points (APs) are installed on telephone poles, and are connected to IP networks by optical fiber cables. Wireless terminals (WTs) are installed on customer premises. A WT is connected to a PC using Ethernet cables and a WT-adapter.
This system offers a Point-to-Point communication service that uses WT pairs.

(*) Standard design values with a cumulative 20 minutes of circuit interruption due to rain fall attenuation of the radio signal per year.
In Japan, the maximum transmission distance is approximately 1.2 Km.

 

Fig. 1 WIPAS STEP 2 service image
Fig. 1 WIPAS STEP 2 service image
Development key-factor
Equipment appearance   ・WT installation images   ・AP installation images
Network configurations
MAC processing
Adaptive modulation function   ・Minimum bandwidth guarantee function
Operation system
Radio zone design tool
P-P communications
MMICs for RF module
Primary specifications

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