Telcordia Technologies

About: Telcordia Technologies is a based out in . It is known for research contribution in the topics: Network packet & Node (networking). The organization has 3097 authors who have published 4737 publications receiving 237882 citations.

A novel approach to the modeling of the indoor power line channel part I: circuit analysis and companion model

Abstract: Multiconductor Transmission Line (MTL) theory is utilized here for modeling the transfer function of power cables in the indoor environment. This approach allows us to determine a circuit model that well characterizes the underlying physics of signal propagation over power-line (PL) cables and that also allows us to account for particular wiring practices common in residential and business environments. In Part II of this work, we will show how the proposed approach allows one to compute a priori and in a deterministic fashion the transfer function of any PL link by using two-port transmission matrices, as commonly done for telephone channel modeling. In this two-part work we will cross several layers of abstraction following a bottom-up approach: starting from the definition of circuit models in this paper, we will arrive at a method for the computation of the transfer function of an indoor PL link in Part II of this work. Moreover, as discussed in Part II, the approach followed here allows us to unveil some special properties of the PL channel that were never reported earlier, such as the symmetry of the transfer function.

Broadband intelligent telecommunications network and method employing a resource system to support network services

Abstract: A Broadband Intelligent Network employs an ATM fast-packet switch to route signaling cells from a calling party to a switch port directly connected to a Service Control Point (SCP) (61). The signaling cells carry a service request that requires the support of a network resource, and, in the specific case described herein, the support of the Line Information Data Base (LIDB) (150) to facilitate the establishment of a switched virtual connection to a called party (54). The SCP (61) acts on the information in the signaling cells and selects the required resource, i.e., the LIDB (150), and then sends a query cell(s) to the LIDB (150) through a permanent virtual connection in the ATM switch (51). The LIDB (150), in turn, acts on the information in the query cell(s) to assemble a response cell(s) with the requested information. The response cell(s) is sent to the SCP (61) through the permanent virtual connection in the ATM switch (51), thereby enabling the SCP to complete call processing, establish the requested connection, and generate a billing record (65).

GHz-bandwidth optical filters based on high-order silicon ring resonators.

Abstract: Previously demonstrated high-order silicon ring filters typically have bandwidths larger than 100 GHz. Here we demonstrate 1-2 GHz-bandwidth filters with very high extinction ratios (~50 dB). The silicon waveguides employed to construct these filters have propagation losses of ~0.5 dB/cm. Each ring of a filter is thermally controlled by metal heaters situated on the top of the ring. With a power dissipation of ~72 mW, the ring resonance can be tuned by one free spectral range, resulting in wavelength-tunable optical filters. Both second-order and fifth-order ring resonators are presented, which can find ready application in microwave/radio frequency signal processing.