October 2009
Lead-free soldering of telecommunication network infrastructure products
Ericsson has successfully transferred to lead-free solder for its high volume telecom network infrastructure products. By implementing measures for lead-free soldering in all stages of the product development process, from design and component selection to the production process, reliable products are ensured.
May 2009
A Comparison of Dynamic Bandwidth Allocation for EPON, GPON, and Next-Generation TDM PON
Dynamic bandwidth allocation in passive optical networks presents a key issue for providing efficient and fair utilization of the PON upstream bandwidth while supporting the QoSrequirements of different traffic classes. In this article we compare the typical characteristics ofDBA, such as bandwidth utilization, delay, and jitter at different traffic loads, within the two major standards for PONs, Ethernet PON and gigabit PON.
May 2009
The fourth generation broadband concept
Fixed-broadband access technology is evolving from exclusively copper-based solutions to hybrid fiber-copper architectures. This article presents the expected next step in the evolution of broadband systems, which we call the fourth-generation broadband concept. It identifies a technical, infrastructural, and economical niche and describes how the fiber-access network is extended and forked to feed a last and ultimate generation of DSL systems, shown to have gigabit potential. The underlying infrastructural concept is presented, economic aspects are described and discussed, and achievable data rates are calculated.
May 2009
Semi-Blind Power Allocation for Digital Subscriber Lines
Digital subscriber lines (DSL) are today one of the most important means for delivering high-speed data transmission. An emerging technique for dealing with one of the technology’s most harmful problems, crosstalk, is dynamic spectrum management (DSM). DSM literature already counts with some half a dozen important solutions. These solutions can be classified according to four different aspects: optimality, computational cost, distribution and required crosstalk channel information.