ITTC Project

Voice Transport Over ATM

Project Award Date: 06-01-1998


There has been a recent resurgence of interest in transporting voice over ATM, sparked in part by the introduction and standardization of AAL2, a new ATM Adaptation Layer (AAL) that fills a need (not met by previous AALs) for multiplexing several small data units from different sources/connections into a single ATM VC connection. This limits packetization delay for compressed voice without wasting transmission bandwidth due to partial filling of ATM cells. The original motivation for AAL2 was to support compressed voice as found in many cellular systems, but voice trunking and ATM to the desktop have since been added as potential AAL2 applications.

The intent of this two-year project is to expand our current studies of AAL2 into the broader arena of Voice Transport over ATM. Another proposal from ITTC (AAL2 Call/Correction Control Signaling, with Joseph Evans as Principal Investigator) will focus on signal/control and implementation issues for AAL2.

The goals below are listed in approximate order of priority. As the project evolves over its two-year length, goals may be revised, deleted, or added as mutually agreed.

o Provide a performance characterization for compressed voice over AAL2, especially in terms of delay jitter (packet delay variation).

o Provide an assessment of potential voice service quality under various connection composition scenarios, including wireless/cellular segments.

o Provide an overall system-level plan for end-to-end Voice Transport Over ATM under various connection composition scenarios, including wireless/ceIIular segments.

o Provide specific recommendations concerning the application of AAL2 to wireless/cellular networks and concerning interworking of VTOA between wireless/cellular networks and fiber-optic ATM networks.

o Specify (as needed) and evaluate appropriate Service-Specific Convergence Sublayer (SSCS) protocols for VTOA using AAL2 (and perhaps AAL1).

o Provide performance evaluations of Voice/Data integration with AAL2.


Faculty Investigator(s): David Petr (PI)

Partner with ITTC

The Information and Telecommunication Technology Center at the University of Kansas has developed several assistance policies that enhance interactions between the Center and local, Kansas, or national companies. 

ITTC assistance includes initial free consulting (normally one to five hours). If additional support is needed, ITTC will offer one of the following approaches: 

Sponsored Research Agreement

Individuals and organizations can enter into agreements with KUCR/ITTC and provide funds for sponsored research to be performed at ITTC with the assistance of faculty, staff and students.

Licensing and Royalty/Equity Agreement

An ITTC goal is the development of investment-grade technologies for transfer to, and marketing by, local, Kansas, and national businesses. To enhance this process, the Center has developed flexible policies that allow for licensing, royalty, and equity arrangements to meet both the needs of ITTC and the company.

Commercialization Development

Companies with a technology need that can be satisfied with ITTC's resources can look to us for assistance. We can develop a relationship with interested partners that will provide for the development of a technology suited for commercialization.

ITTC Resource Access

ITTC resources, including computers and software systems, may be made available to Kansas companies in accordance with the Center's mission and applicable Regents and University policies.

ITTC Calendar
There are no upcoming events at this time.