ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ» º º º TROUBLESHOOTING THE INTEL 2400B MNP AND 2400EX MNP MODEMS º º º ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ The following information can help you solve certain problems with your Intel product. "(Field report)" means that the information comes from a customer and may not have been verified by Intel's compatibility lab. GENERAL MNP PROBLEMS ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ MNP DOESN'T WORK WITH UNIX/XENIX UUCP Having MNP enabled during Unix/Xenix UUCP file transfers will cause numerous data errors, slow throughput, and, in most cases, a complete shutdown of the transfer. This is because UUCP is a complex packet switching protocol that is extremely time sensitive. MNP causes several data stream "bursts" that will destroy UUCP connections. Santa Cruz Operation, makers of SCO Xenix, recommends not using MNP with UUCP. MODEM APPEARS TO BE LOCKED UP CAUSE: This can happen in MNP modems when flow control is set ON. Symptoms include sudden halts or excessive timeouts during binary or ASCII file transmissions and data going from the computer to the modem but never reaching the remote modem. CURE: Before dialing a BBS (or mainframe) issue the command "AT\Q0\G0". This command turns off all flow control. Don't confuse the "\Q0" with command with the "Q0" command. They serve completely different functions. Read you modem command guide for more details. MODEM SUDDENLY DISCONNECTS CAUSE: Intel MNP modems have an inactivity timer which hangs up after a predetermined number of munites pass with no data sent or received. The remote modem disconnecting or a noisy could also cause the modem to hang up. CURE: Disable the inactivity timer using the command "AT\T0". MODEM WON'T STORE PHONE NUMBERS CAUSE: In Intel MNP modems, you can store up to 4 phone numbers using the AT&Z command. However, the description of the command in the documentation is not correct (Modem Command Guide #301652-002). ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ 1/91 Intel FaxBack # 4368 Page 1 ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ» º º º TROUBLESHOOTING THE INTEL 2400B MNP AND 2400EX MNP MODEMS º º º ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ (continued) ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ CURE: The correct command is AT&Zn=XXXXXXXXX (where n=0-3 and X's represent any character you would normally include after the D in an ATD command). To dial a number that has already been stored, use ATDSn or ATDS=n (where n=0-3). For example, to store "T9,645-6275" in register 2, type AT&Z2=T9,645-6275 then press the enter key. To dial the stored number, type ATDS=2 then press enter. REMOTE COMPUTER DOESN'T RESPOND TO COMMANDS CAUSE: This can happen in MNP modems when flow control is set ON. Symptoms include sudden halts or excessive timeouts during binary or ASCII file transmissions and data going from the computer to the modem but never reaching the remote modem. CURE: Before dialing a BBS (or mainframe) issue the command "AT\Q0\G0". This command turns off all flow control. Don't confuse the "\Q0" with command with the "Q0" command. They serve completely different functions. Read you modem command guide for more details. &V COMMAND NOT SUPPORTED CAUSE: Intel modems do not support the &V command which dumps the modem settings to the screen. CURE: Use the \S command instead. 2400EX MNP ÄÄÄÄÄÄÄÄÄÄ MR LED STEADY ON The Intel 2400EX and 2400EX MNP manuals incorrectly state, "If the MR light stays ON, the modem isn't working". The correct statement is, "If the MR light is FLASHING constantly, the modem isn't working". Intel has printed an errata to correct the error. ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ 1/91 Intel FaxBack # 4368 Page 2