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# Algorithm for Voice and Data Transmission in Hybrid Switches

IP.com Disclosure Number: IPCOM000035051D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 13K

IBM

## Related People

Stevens, RP: AUTHOR [+2]

## Abstract

An algorithm, described herein, improves the functioning of hybrid switches. Though there are various possible alternatives, it is assumed that digital voice and bulk data use circuit switching. Other kinds of data (like low speed data, facsimile, signalling, telemetry, slow scan video and interactive data) use packet switching. Voice needs to have priority over bulk data. But, at the same time, an algorithm is required to increase the utilization of the circuit switching portion. The algorithm is given below. 1. If digitized voice is to be transmitted, use circuit switching. 2. Depending upon the data rate, calculate the packet size of the bulk data which can be transmitted in 150 ms which is the threshold value for the bulk data packet size.

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Algorithm for Voice and Data Transmission in Hybrid Switches

An algorithm, described herein, improves the functioning of hybrid switches. Though there are various possible alternatives, it is assumed that digital voice and bulk data use circuit switching. Other kinds of data (like low speed data, facsimile, signalling, telemetry, slow scan video and interactive data) use packet switching. Voice needs to have priority over bulk data. But, at the same time, an algorithm is required to increase the utilization of the circuit switching portion. The algorithm is given below. 1. If digitized voice is to be transmitted, use circuit

switching.

2. Depending upon the data rate, calculate the packet size of

the bulk data which can be transmitted in 150 ms which is

the threshold value for the bulk data packet size. This is

based on the value of 140 ms for call set up or disconnection.

With the advance of technology, this value of 140 ms could be

lower.

3. Wait for 150 ms. If bulk data is available, buffer this bulk

data. If the circuit switching portion is available,

send the bulk data by circuit switching. The packet

size is as calculated in step 2. After transmitting

the bulk data, check if the voice flag is on. Voice

flag is used to check if digitized voice is being

transmitted. This flag is also set to on, if there is

demand for voice, while bulk data is being sent. While

sending bulk data, send the frame sequence also in the