Meinberg PTP270PEX, Руководство пользователя, Страница: 5 / 23

Page 2 2 General information
2 General information
The module PTP270PEX acts as a slave device in IEEE 1588-2008 (PTPv2) compatible networks and can be used
to synchronize the computer`s system time to the PTP time received from a grandmaster clock like LANTIME
M600/GPS/PTP.
The integrated single board computer (SBC) is running the PTP stack and provides a PCI Express interface
that is compatible with other Meinberg PCIe devices. In this way the board PTP270PEX can be operated by
using the standard Meinberg driver package and there is no need to run a PTP software on the computer.
PTP270PEX can not be used as a standard network interface card.
2.1 Content of the USB stick
The included USB stick contains a driver program that keeps the computer`s system time synchronous to the
received IEEE 1588 time. If the delivered stick doesn't include a driver program for the operating system used, it
can be downloaded from:
http://www.meinberg.de/german/sw/
On the USB stick there is a le called "readme.txt", which helps installing the driver correctly.
2.2 Mode of operation
The on-board Time Stamp Unit (TSU) integrated in a FPGA (Field Programmable Gate Array, programmable
logic device), monitors the data trac on the MII-interface between the PHYceiver (physical connection to the
network) and the Ethernet controller (MAC) of PTP270PEX. If a valid PTP packet is detected, the TSU takes
a time stamp that is read out by the single board computer running the PTP stack.
After decoding a valid time information from a PTP Master, the system sets it`s own PTP seconds and nanosec-
onds accordingly. The PTP oset calculated by the PTP driver software of the single board computer is used for
adjustment of the master oscillator of PTP270PEX.
2.3 Features PTP270PEX
The module PTP270PEX provides a high precision time base (TCXO or OCXO) with multiple outputs for 10MHz,
PPS and IRIG, synchronized by a PTP IEEE 1588 grandmaster reference clock. Three user congurable outputs
for 1 PPS, 10 MHz and unmodulated time code (IRIG) can be set up. Also two capture inputs are integrated to
get high precision time stamps of external events. A simplied LINUX operating system is installed on the single
board computers ash disk.
2 Date: 22nd November 2012 PTP270PEX