Just a note to say that a HP 5087A distribution amplifier arrived yesterday
purchased from a seller on eBay (http://www.ebay.com/itm/300903865292). I
initially emailed him requesting the option information on the unit or if he
could give information as to what option modules are installed insid
Well you sent me on a search. I know virtually zip about ptp, but this page
lists a few ethernet cards that allow time stamping. Is this the same as having
a 1588 card?
https://github.com/richardcochran/linuxptp-as/blob/master/README.org
-Original Message-
From: Doug Calvert
Sender: ti
On Thu, Jun 6, 2013 at 8:48 PM, Bob Camp wrote:
> 1588 compatible network cards are capable of time stamping everything
> that goes in and out. They are pretty common these days both as stand
> alone cards and as peripherals on MCU's. There's no real need to do
> hardware, just come up with drive
On 07.06.2013 19:23, Perry Sandeen wrote:
List,
Another hardware possibility.
Double the 10 MHz to 20 MHz.
With another circuit of 74HC390’s divide 10 MHz to
200 KHz. Then double it twice to 800 KHz
with LM 1496 DBM’s. Apply the two
frequencies to a LM 1496 DBM and use a LPF to get th
Since the actual crystal frequency appears to be 19.2 MHz rather than
19.5, my original suggestion of injection locking it would have to be
modified. For example, you could divide the 10 MHz by 25 ( a single
74HC390 could do it) to make 400 kHz, so 19.2 MHz could sync to the
48th harmonic.
Ed
I'm glad I asked this question. I was hoping to get ideas I'd never think
of.
It's going to be hard to beat that TI PLL chip especially because TI offers
free samples.
The injection idea seems almost like cheating. I might use part of the
idea below to divide down 10MHz then inject that into the
List,
Another hardware possibility.
Double the 10 MHz to 20 MHz.
With another circuit of 74HC390’s divide 10 MHz to
200 KHz. Then double it twice to 800 KHz
with LM 1496 DBM’s. Apply the two
frequencies to a LM 1496 DBM and use a LPF to get the 19.2 MHz.
Hardware complicated? A bit.
Hi
All of the MCU based 1588 interfaces I have seen allow you to "get at" the
internal 1588 stamping clock. You can stuff your pps in there and compare it
directly to the stamps it puts on the incoming and outgoing packets. If you are
on an MCU, the 1588 clock can easily be the same as your CPU
On 06/07/2013 02:48 AM, Bob Camp wrote:
Hi
1588 compatible network cards are capable of time stamping everything that goes
in and out. They are pretty common these days both as stand alone cards and as
peripherals on MCU's. There's no real need to do hardware, just come up with
drivers (and a
