19.2.19 GPS time synchronization module (GTM)
19.2.19.1 Introduction
This module includes a GPS receiver used for time synchronization. The GPS has one
SMA contact for connection to an antenna. It also includes an optical PPS ST-
connector output.
19.2.19.2 Design
The GTM is a PCMIP-format card and is placed only on one of the ADM slots. The
antenna input connector is shielded and directly attached to a grounded plate to
eliminate the risk of electromagnetic interference.
All communication between the GCM and the NUM is via the PCI-bus. PPS time data
is sent from the GCM to the rest of the time system to provide 1μs accuracy at
sampling level. An optical transmitter for PPS output is available for time
synchronization of another relay with an optical PPS input. The PPS output connector
is of ST-type for multimode fibre and could be used up to 1 km.
GPS- receiver
FPGA
PCI
PCI
IO
Antenna
connector
Config-
memory
OSC
ID- chip
Wishbone bus
Optical
PPS
transmitter
Transmitter
Driver
Registers
PCI- core
Receiver
memory
Stripline ( 50 Ohms)
TSU
JTAG
connector
UART--
core
Controller
S
e
l
e
c
t
o
r
IEC09000980-1-en.vsd
IEC09000980 V1 EN
Figure 541: Block diagram of the GCM
1MRK505222-UUS C Section 19
IED hardware
1129
Technical reference manual
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