Free Papers: IMS

The IMS (IP Multimedia Subsystem) is an architectural framework for delivering Internet Protocol (IP) multimedia services. Originally designed by the 3GPP as a part of the vision for evolving mobile networks beyond GSM, this vision was later updated by 3GPP, 3GPP2 and TISPAN by requiring support of networks other than GPRS, such as Wireless LAN, CDMA2000 and fixed line. IMS uses IETF protocols...

Tutorial: Optic and WDM

A new free tutorial has been launched at the Comsoc tutorial site. Titled Basics of Optical Communications and WDM, the tutorial covers the functions and operational characteristics of available optical fibers, transceivers, and specialized passive and active components needed for designing modern optical fiber communication links. It explains the distortion effects that dispersion and nonlinear...