Browse Prior Art Database

Automatic Remote Modem Speed Checking

IP.com Disclosure Number: IPCOM000061049D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Giuliano, H: AUTHOR [+2]

Abstract

Consider a baseband modem network involving one control modem (CTRL) and one/or several tributary modems (TRIBUTARY). The number of operational speeds may be fairly high (e.g., 2400, 4800, 7200, 9600, 14400, 19200 BPS); the probability of speed incompatibility between the control modem and tributary modem(s) is high. In case of speed incompatibility, the transmission trouble can be difficult to diagnose. The network includes remote testing facilities based on a protocol including a test request phase initiated by the control modem. Also one of the tests, namely, remote loop-back test, will involve the remote modem feeding the received data back to the control modem. The speed checking operation takes benefit of these existing facilities.

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Automatic Remote Modem Speed Checking

Consider a baseband modem network involving one control modem (CTRL) and one/or several tributary modems (TRIBUTARY). The number of operational speeds may be fairly high (e.g., 2400, 4800, 7200, 9600, 14400, 19200 BPS); the probability of speed incompatibility between the control modem and tributary modem(s) is high. In case of speed incompatibility, the transmission trouble can be difficult to diagnose. The network includes remote testing facilities based on a protocol including a test request phase initiated by the control modem. Also one of the tests, namely, remote loop-back test, will involve the remote modem feeding the received data back to the control modem. The speed checking operation takes benefit of these existing facilities. When a loop-back test request message is generated by the control modem, the control modem speed indication is embedded into the message. The tributary modem concerned stores this indication and inserts its own speed back to the control modem upon the loop-back operation. Both remote and control modems are then aware of any spread incompatibility and necessary adjustments can be made. This type of operation can be extended to any other option of the modems.

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