06169735 is referenced by 97 patents and cites 26 patents.

An Asynchronous Transfer Mode (ATM)-based distributed virtual tandem switching system is provided in which a network of ATM-based devices is combined to create a distributed virtual tandem switch. The system includes an ATM switching network that dynamically sets up individual switched virtual connections. The system also includes a trunk interworking function (T-IWF) device and a centralized control and signaling interworking function (CS-IWF) device. The trunk interworking function device converts end office voice trunks from TDM channels to ATM cells by employing a structured circuit emulation service. The centralized control and signaling interworking function device performs call control functions and interfaces narrowband signaling and broadband signaling for call processing and control within the ATM switching network. Consequently, the ATM based distributed virtual tandem switching system replaces a standard tandem switch in the PSTN.

Title
ATM-based distributed virtual tandem switching system
Application Number
9/287092
Publication Number
6169735 (A)
Application Date
April 7, 1999
Publication Date
January 2, 2001
Inventor
Richard W Stephenson
Austin
TX, US
Samuel Sigarto
Austin
TX, US
Steven R Partridge
Austin
TX, US
Haifeng Bi
Austin
TX, US
George C Allen Jr
Austin
TX, US
Agent
Greenblum & Bernstein
US
Assignee
SBC Technology Resources
TX, US
IPC
H04M 7/00
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