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Internal Modem Online Test

IP.com Disclosure Number: IPCOM000039058D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 15K

Publishing Venue

IBM

Related People

Baier, KJ: AUTHOR [+4]

Abstract

A modem can pass advanced diagnostics and still be unable to function correctly in an online capacity. The online test provides a quick means of verifying communication capability. The internal modem online test utility assumes that a user who questions whether his modem is functioning properly will attempt to communicate with a known good modem. At the beginning of the online test, the user is presented with a series of six menus. The menus allow the selection of options which the modem will use to run the online test. The options are: 1. transmit or receive 2. hang up or enable voice communications 3.baud rate (110, 300 or 1200 bps) 4. data format (8-bit data word, 1-stop bit, no parity, or 7-bit data word, 1-stop bit, even, odd, mark, or space parity) 5.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 52% of the total text.

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Internal Modem Online Test

A modem can pass advanced diagnostics and still be unable to function correctly in an online capacity. The online test provides a quick means of verifying communication capability. The internal modem online test utility assumes that a user who questions whether his modem is functioning properly will attempt to communicate with a known good modem. At the beginning of the online test, the user is presented with a series of six menus. The menus allow the selection of options which the modem will use to run the online test. The options are: 1. transmit or receive

2. hang up or enable voice communications

3.baud rate (110, 300 or 1200 bps)

4. data format (8-bit data word, 1-stop bit, no

parity, or 7-bit data word, 1-stop bit, even, odd,

mark, or space parity)

5. call or answer

a. call by autodialing or manual origination (if

autodialing is chosen, the user is prompted

to type in the number to dial)

b. answer by autoanswering or manual answering As the user selects options from the menus, program variables are set and commands are issued to

the modem. After the final option has been selected,

the user is prompted to "press enter to begin test."

After the enter key is pressed, the test proceeds

automatically. If the autodial option was selected, the modem dials the number that the user typed in. Autodialing defaults to tone dialing. If a connection is not made, the user can choose to have the modem redial the number. If the autoanswer option was selected, the modem waits indefinitely for an incoming call to arrive. The user can choose to disable autoanswer at any time before a call is received by pressing the enter key. "No call received" will be displayed and the modem will no longer autoanswer. If the manual answer option was chosen, the modem will place an answer tone on the phone line and wait for an incoming carrier for up to two minutes. If the manual originate option was chosen, the modem will search for a carrier tone (i.e., the other modem's answer tone) for up to two minutes. When a connection is made, "connected" is displayed. If no connection is made, an appropriate status message (e.g., "busy," "no answer," "no dial tone," "handshake failed") is displayed. When the users select the data format option, the number of characters that should be transmitted and received is determined.

If the data format is eight bits per data word, 252 characters should be transmitted or received. Otherwise, 126 characters should be transmitted/received. After a connection has been established, the modem designated as the transmitter waits five seconds and then begins to transmit data. If the modem is unable to transmit a character, the message "Timeout- -unable to transmit all or part of data" is displayed on the transmitter's display. If the modem

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transmits all data, the message "All data has been transmitted" is displayed on the transmitter's display. The modem designated as the receiver waits up to thi...