1. National Telecommunication Institute (NTI),Switching Department,Cairo,Egypt
2. Institut Polytechnique de Paris,SAMOVAR - Telecom SudParis,Palaiseau,France
3. Iowa State University,Electrical and Computer Engineering Department,Ames,USA
4. Université Paris Cité,LIPADE,Paris,France
5. Institut Polytechnique de Paris,Telecom SudParis,Palaiseau,France