Configure Interal Modem on D370

[Darren Gaile]

Hi all,
I'm configuring an the internal modem on a newly installed HP9000 D370 running HP-UX 11.11 B. I've installed the modem via SAM with a buad rate of 9600 and it has created the following three device files.

/dev/cul0p7
/dev/ttyd0p7
/dev/cua0p7

I've put the following lines into /etc/uucp/Decives

ACU cul0p7 - 9600 ps_hayes_tone
Direct cul0p7 - 9600 direct

I've only used the CUL0p7 device as the modem just needs to be able to call out and not receive.

The Problem.
I can run cu -s9600 -lcul0p7 dir
and run AT command ATDT and the modem dials correctly. However, if if try using CU to dial by running cu -s9600 , I get.

Audodialing - please wait
Connect failed: Requested device not availble.

Not sure why this is happening. Anyone have any thoughts.

Cheers.

[Darren Prior · Accepted solution]

Hi Darren,

The internal modem on the D-class isn't supported for customer use. There are some good reasons for this, one of which is that if the modem gets into a hung state, you will have to power cycle the D-class. The modem is a cut-down version of a MultiTech modem - and is only designed for HP's support engineers to dial in when required, and for Predict to dial out.

The supported way to add a modem to a D-class is to connect it to a separate mux.

regards,

Darren.

[Darren Gaile]

The would explain it. Thanks for your help.

Darren.

[Nick Wickens]

I would also add a recollection that a number of PCI cards that can be installed on the "D" class that worked under 11.0 became unsupported at 11.11.

In particular this included LAN cards such as the 100VG but I think modem cards may have fallen into this bracket ?

[Darren Gaile]

Thanks. I'm going to configure an external modem to work on the built in Serial port 2. I can't see any problems in doing that.

[Darren Prior]

Hi Darren,

I don't like to be the bearer of bad news, but... the pair of 9 pin serial ports on the D-class are not supported for modem use either. They don't have all the required handshaking for modems.

I should also add that unsupported doesn't necessarily mean something won't work, it means that HP haven't tested and approved it. There are people out there that have managed to get modems working on that port - but they generally find that it only works correctly the first time unless the modem is power cycled.

regards,

Darren.

[Darren Gaile]

How did I know it wasn't going to be that simple. However, I got this machine from a sister company who would have used the modem also. There are no additional MUX cards installed so I'm assuming they used the 9-pin serial. I'll give it a try and post back to let you know my findings.

Thanks.

[Darren Gaile]

OK, I managed to get the modem working correctly on the standard serial port 8/20/2.

Strangely, using SAM to add the modem which created the relevent /dev files caused a "Line Problem" error to be displayed when using the "CU" command.

I removed the modem and added it manually using the the mkfs for each of the 3 devices files required. The modem doesn't appear in SAM as a peripheral but the modem does work. Strange. The configuration created using SAM and then using the mksf looked identical.