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.

Optical control of deposition of crystal monolayers

Abstract: A method and apparatus for epitaxial growth of precisely one monolayer. The growth is by organometallic chemical vapor deposition in which the substrate is alternately exposed to the anion and cation of a III-V compound. During deposition of the cation, for instance Ga or Al, reflectance difference spectroscopy is performed to obtain the difference of reflected light beams polarized in orthogonal directions. A growth of a monolayer and even of a partial monolayer can be monitored in real time.

Loop makeup identification via single ended testing: beyond mere loop qualification

Abstract: Digital subscriber lines (DSLs) offer carriers the possibility of exploiting the existing loop plant to deliver high-speed data and voice services. However, before deploying DSL, local loops must be tested in order to see whether they can support service, and at what level. In fact, there are many impairments that could disqualify a loop for supporting DSL services: load coils, excessive loop length, bridged taps, and wideband noise. Single-ended automatic qualification is essential for achieving low-cost deployment of DSL, since it allows loops to be qualified in bulk and does not involve any human intervention at the customer's location. An even more ambitious challenge is to fully characterize a loop, i.e., to identify its loop makeup. If it is feasible to perform loop makeup identification via single-ended measurements with sufficient accuracy, then operators will benefit substantially because, besides qualifying a loop for DSL service, this capability will allow the updating of telephone company loop-records. These records can in turn be accessed to support engineering, provisioning and maintenance operations. Despite its potential importance, the possibility of achieving loop makeup identification via single-ended measurements is not widely addressed in the current literature. In the present contribution the feasibility of loop makeup identification via single-ended measurements is presented.

Multiple block-size transform video coding using an asymmetric sub-band structure

Abstract: A sub-band coder for video signals is disclosed, which is easily realizable in VLSI due to its simple structure. The coder uses sets of two-tap finite impulse response (FIR) filters having equal-magnitude coefficients to decompose the video signal at multiple stages. In the preferred embodiment the sub-band coder has an asymmetrical structure. With the arrangement, the sub-band decomposition effects what is equivalent to a multiple block-size Hadamard transform of the video signal in which coefficients are transmitted from various block-sized transforms of larger blocks of pixel data.

Broadband ISDN processing method and system

Abstract: Method and system are provided for processing B-ISDN transfer protocols in a telecommunication system utilizing a generic ATM/AAL interface having a programmable electronic circuit. At the ATM Adaptation Layer (AAL), segmentation and reassembly, and convergence sublayer protocols have been developed to support the different service types to be handled. The interface facilitates a cost effective yet relatively simple broadband ATM/AAL terminal adapter that performs ATM and ATM Adaptation Layer processing in a very flexible manner. The terminal adapter handles several different transfer protocols (AAL types 1, 3, 4 and 5) using a single architecture on a per protocol data unit (PDU) basis and may be implemented using field programmable gate arrays and off-the-shelf components. The method and system is flexible enough to support changes in existing, new and future AAL/ATM standards.