Browse Prior Art Database

MIRS RADIO TO RADIO PSTN FAX AND DATA DIGITAL CALL IMPLEMENTATION

IP.com Disclosure Number: IPCOM000007208D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2002-Mar-05
Document File: 4 page(s) / 133K

Publishing Venue

Motorola

Related People

Rod Averbuch: AUTHOR

Abstract

The most common data services today are PSTN modem for Fax and general data transfer services. The first data services that will be released in MIRS and other digital radio networks will be based on a flavor of PSTN DTE to DCE interface in the mobile for FAX and data services. In reality, In digital radio networks, the actual PSTN modems are not located in the RF unit, a PSTN modem pool is located in a separate network gateway called IWE.

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Page 1 of 4

MO-LA Technical Developments Volume 22 June 1994

MIRS RADIO TO RADIO PSTN FAX AND DATA DIGITAL CALL IMPLEMENTATION

by Rod Averbuch

INTRODUCTION: 2. There are several implementation problems that should be solved when PSTN digital mobile to The most common data services today are PSTN mobile service is considered.
modem for Fax and general data transfer services.

The first data services that will be released in MIRS 2a. It is desirable to reuse the PSTN interworking and other digital radio networks will be based on a and networking function blocks to eliminate a heavy flavor of PSTN DTE to DCE interface in the mobile development effort to support this service.
for FAX and data services. In reality, In digital radio
networks, the actual PSTN modems are not located 2b. It is desirable that mobile PSTN interface as in the RF unit, a PSTN modem pool is located in a well as mobile hmctionality will not be changed for separate network gateway called IWE supporting this service.

  1. In a situation that the call is routed internally 2c. RLP [2] termination in both radio end with- in the radio digital network or through land digital out IWF termination in between will expose the networks it is desirable to eliminate the back to back protocol to two air paths that will contribute to poor PSTN modems, yet to provide a popular PSTN inter- protocol performances.
face to the user. The advantages of modem elimina-
tion are: 2d. The Inband protocol [l] can not be directly

-Fast call set up (modem training elimination) looped back in to the network. -Better service quality (bypassing audio modu-
lation and demodulation.
-Less infrastructure equipment.

  2e. The IWF should be informed for the incom- ing call type in order to distinguish between PSTN modem and PSTN digital call.

Figure 1 -Sack to back PSTN modems

0 Mmn01~. 1°C. 1994 67

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Page 2 of 4

0 M MO-LA

Technical Developments Volume 22 June 1994

A new sofiware entity is added "100~" to gate- way the in band messaging properly (problem 22.)

  4. The RLP protocol~is braked into two to elimi- nate the throughput, delay and error impact o...