[EMAIL PROTECTED] wrote:
Ulrich Windl wrote:
[EMAIL PROTECTED] writes:
Fellow techs,
Thanks for tuning into my issue of the day. I need to achieve 2 things.
The first is to obtain and install the PPS kit onto Spectracom's
TTS240rb. I spoke with the support folks a Spectracom and they
suggested I post here. The second is to install the PPS kernel
components on a RedHat ES 4 system running 2.6.9-XX.
<snip>
Regardless, after running the test scripts, it appeared that my kernel
and hardware could in fact get to within a millisecond. My next
question was, how do I get that improvement into my environment. The
answer from my vendor was 2 part: 1. get a PPS kit for my Spectracom
time server
I think you may have misunderstood your vendor. I had a look at the
Spectracom data sheet and your device is a complete ntp server with the
extra PPS + other time code output. You do not need, and could not apply
any modifications to the propriety Server code in the box.
As for a PPS Kit for your linux distrib, I suggest you talk to
Redhat. They may have an implementation ready to go, else you could
tailor PPSkit-light yourself.
http://www.kernel.org/pub/linux/daemons/ntp/pps/
from Spectracoms data sheet:
OUTPUTS:
Type Connector
Ethernet 10/100 BaseT RJ45 (auto sensing)
Two RS-232 Serial Comm DB9 female
Two RS-485 Once-per-second 3.81mm Terminal Block
IRIG B/E AM/TTL BNC
1PPS, Pulse-per-second BNC
so you will need hardware to convert PPS (or IRIG ) to rs232 input to
your server. THese outputs usually put out low voltage signals not
suitable for direct connect to PC interfaces.
10 MHz BNC
Three Alarm/Programmable Timer 3.81mm Terminal Block
So using just the NTP server over ethernet you should be seeing sub
millisecond accuracy. To get better you should check try the Type 4
refclock driver which states it supports all known Spectracom servers
over the rs232 interface, where I guess there is proprierty time code
though I could not down load the manual to check what formats are available.
I could not see a generic IRIG driver available. There must be one
somewhere.
and 2. get the appropriate PPS implementation for my client
systems. In looking around the internet, I've found a few postings that
led me to believe that people have this working for other linux
implementations that were NTPv4 and various kernel revs.
Is this making sense? Thanks for your time.
Allen
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