Nortel Networks Corporation

Northern Telecom Limited

Alcatel USA Sourcing, L.p.

Osama Bahgat

James Leslie Watchorn

Tony Huang

Gary Michael Depelteau

John Edward Vincent

George Frank Irwin

David Anthony Fisher

Hamid R Baradaran

Prakash Appanna

Hans Christian Mogensen

James Lotz

Melhem I Chaar

Michael F Kemp

Jensheng Lee

James C McLaughlin

Tom Kwang-Tsai Koai

Paul Fong-Yan Hung

An asymmetrical digital subscriber line (ADSL) downstream high speed cell bus interface protocol allows ADSL cell packets to be transmitted downstream from an ADSL bank control unit (ABCU) to a plurality of ADSL line units at a high rate of downstream throughput with flexible and efficient allocation of bandwidths and reduced error probability. The frame boundaries of an ADSL frame are derived from a conventional subscriber bus interface (SBI) frame for carrying conventional narrowband plain old telephone service (POTS) traffic, thereby allowing the ABCU and the ADSL line units to be implemented in existing channel banks with standard channel bank backplane traces.

Asymmetrical digital subscriber line (ADSL) downstream high speed cell bus interface protocol

A communication system consisting of a number of modules that communicate with one another through a shared communications bus which accommodates different protocols. The system includes a bus clock for defining a frame having a plurality of time slots for communicating signals on the bus; and a bus management algorithm for specifying a receive assignment definition and a transmit assignment definition. The receive assignment definition defines a receive channel for each of the modules representing a set of the time slots, where the modules receive signals from the bus during the set of time slots prescribed by the receive channel. The transmit assignment definition defines a transmit channel for each of the modules representing a set of the time slots, where the modules transmit signals to the bus during the set of time slots prescribed by the transmit channel.

Generic bus system

Methods and apparatus are described for translating identifiers that are used by computers to reference various entities such as data structures, external objects, or connections in a telecommunications network, from a bulkier less manageable format to a smaller more manageable format. Such translations are carried out to reduce the needless processing and memory demands that are made of a localized set of components when the large identifiers the set receives from other components include fields that none of the members of the set need to access. The invention is centerd around a two-stage look-up method wherein an inputted external identifier is divided into two parts. The first part of the inputted external identifier is used as an address into a first look-up table that contains base-addresses of a second look-up table. The second part of the inputted external identifier is used as an offset-address into the second look-up table. The offset-address and the base-address are combined to access the second look-up table, which contains all the internal identifiers. The invention can be easily scaled to handle a larger range of external identifiers, and a larger number of internal identifiers. The invention operates at a fast and predictable speed. Use of the invention also leads to a significant savings in memory costs.

Method and apparatus for full range translation of large external identifier to small internal identifier

Growing community of inventors

Petaluma, CA, United States of America

Osama Bahgat