This may sound like an embarrassment of riches, but here is my problem:
I have some rack-mounted servers (IBM System x3650 to be precise) that I
need to synchronize with a PPS signal. The problem is, of course, that
the machines have only one serial port, which I want to use as a serial
consol
John Ioannidis said the following on 05/29/2008 03:10 PM:
> This may sound like an embarrassment of riches, but here is my problem:
> I have some rack-mounted servers (IBM System x3650 to be precise) that I
> need to synchronize with a PPS signal. The problem is, of course, that
> the machines
> Date: Thu, 29 May 2008 15:10:35 -0400
> From: John Ioannidis <[EMAIL PROTECTED]>
> Sender: [EMAIL PROTECTED]
>
>
> This may sound like an embarrassment of riches, but here is my problem:
> I have some rack-mounted servers (IBM System x3650 to be precise) that I
> need to synchronize with a PP
In article <[EMAIL PROTECTED]>,
[EMAIL PROTECTED] (John Ioannidis) writes:
>This may sound like an embarrassment of riches, but here is my problem:
>I have some rack-mounted servers (IBM System x3650 to be precise) that I
>need to synchronize with a PPS signal. The problem is, of course, that
[EMAIL PROTECTED] (John Ackermann N8UR) writes:
>John Ioannidis said the following on 05/29/2008 03:10 PM:
>> This may sound like an embarrassment of riches, but here is my problem:
>> I have some rack-mounted servers (IBM System x3650 to be precise) that I
>> need to synchronize with a PPS sign
Unruh said the following on 05/29/2008 05:00 PM:
>>
>> If you need to distribute the same PPS signal to a number of boxes, I
>> designed a board which is being sold as a kit by TAPR (we have
>> arrangements with someone who can assemble them for a fee, if required)
>> that provides up to six TTL
[EMAIL PROTECTED] (John Ackermann N8UR) writes:
>Unruh said the following on 05/29/2008 05:00 PM:
>>>
>>> If you need to distribute the same PPS signal to a number of boxes, I
>>> designed a board which is being sold as a kit by TAPR (we have
>>> arrangements with someone who can assemble them f
Unruh said the following on 05/29/2008 06:36 PM:
> Since my GPS is only good to just under a usec, and since servicing of
> interrupts is also at that level, it does not really seem to matter. The
> program I wrote was to run off the parallel port interrupt, but it seems to
> have about 2usec jitt
Kevin Oberman wrote:
>
> Almost all rack-mount system with a single serial port also have a
> header for the second serial port. I have many of these, though they are
> SuperMicro, not IBM. The physical connector is a a bulkhead plate that
> fits in the same place as a PCI card would be mounted.
Unruh wrote:
> Since my GPS is only good to just under a usec, and since servicing of
> interrupts is also at that level, it does not really seem to matter. The
> program I wrote was to run off the parallel port interrupt, but it seems to
> have about 2usec jitter on readout.
That is about the tim
John,
The PPSAPI was designed so that any serial device, including the
console, could be used for the DCD signal. Our problem with Sun Netras
is that the DCD signal is not supported. Something like a SIIG serial
card should work just fine.
Dave
John Ioannidis wrote:
> This may sound like an
Uwe Klein <[EMAIL PROTECTED]> writes:
>Unruh wrote:
>> Since my GPS is only good to just under a usec, and since servicing of
>> interrupts is also at that level, it does not really seem to matter. The
>> program I wrote was to run off the parallel port interrupt, but it seems to
>> have about 2u
David L. Mills wrote:
> John,
>
> The PPSAPI was designed so that any serial device, including the
> console, could be used for the DCD signal. Our problem with Sun Netras
> is that the DCD signal is not supported. Something like a SIIG serial
> card should work just fine.
Could you elaborate.
Brian,
I haven't seen the machine; it allegedly is a 1U and was installed as a
replacement for a Sun 10. My report was based on a staff message. I do
know the connector is a modular jack with four pins.
Dave
Brian Utterback wrote:
> David L. Mills wrote:
>
>> John,
>>
>> The PPSAPI was desig
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