TDM over IP (IP circuit emulation service)
AssigneeRAD Data Communication Ltd.
InventorHugo Silverman
Life of this patent
Estimating the term…
Abstract
A method and system for processing one or more TDMs for communication over IP networks, such as the Internet, includes encapsulating ATM cells (packets) using AAL1 cells within UDP over IP frames to provide synchronous bit streams into fixed size cells. This allows for an IP header to be added to the packets, with such packets forwarded to its destination host across the IP network. The destination regenerates the clock, decrypts/strips the IP header and delivers a synchronous bit stream. Furthermore, an adaptive clock is provided for clock transfer across the network. The adaptive clock regenerates the far end T1/E1 receive clock out of the incoming arrival frame rate. Frames arriving from the IP network are stored in a buffer and taken out for TDM stream assembly.
Claims41
A computer based communications system implementing TDM over an Internet Protocol network (TDM over IP, TDMoIP), said system comprising:
- an IP network;
- a TDM source stream;
- decoder to decode said TDM source stream;
- a converter to convert one or more parts of said decoded TDM source stream into a circuit emulation service(CES) structure;
- a segmenter to partition said converted one or more parts and remove cell header(s);
- packetizer receiving output from said segmenter and packetizing thereof, and
- wherein packets output from said packetizer are an IP compatible format suitable for transfer over said IP network.
A computer based method implementing TDM over an Internet Protocol network (TDM over IP, TDMoIP), comprising the following steps for TDM up and down stream link port flow:
- A. said down link flow of said TDM stream comprising the steps:
- (1) receiving one or more TDM signals;
- (2) decoding said received one or more TDM signals from line and frame alignment;
- (3) building structures according to circuit emulation service(CES) standards;
- (4) segmenting said structures into ATM cells;
- (5) stripping the ATM header;
- (6) packetizing the stripped cells into UDP over IP Ethernet frames, and
- (7) transmitting said packetized cells over IP networks;
- B. said up link flow of said TDM stream uplink port comprising the steps:
- (1) receiving Ethernet frames from said IP network;
- (2) stripping the ATM cells from a UDP payload;
- (3) reassembling said stripped cells according to circuit emulation service(CES) standards;
- (4) compensating for network delay variations;
- (5) framing said reassembled cells;
- (6) encoding said framed output;
- (7) transmitting said encoded output over TDM lines.
A computer based method implementing TDM over an Internet Protocol network (TDM over IP, TDMoIP), comprising the following:
- receiving one or more TDM signals;
- decoding said received one or more TDM signals;
- building ATM CES structures using AAL1 cells without a cell header;
- encapsulating said ATM CES structures into UDP over IP frames, and
- transmitting said UDP over IP frames over UP networks.
Dependencies are inferred from the claim text.