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Chapter 4
Basic Testing
Preparing to test
T-BERD/MTS/SC Getting Started Guide
Page 92
22046537, Rev. 016
March 2018
To connect a CDMA receiver to your instrument
1
Connect the ToD signal between the CDMA receiver and the MST6000 or
MST8000.
a
Connect one end of the Ethernet cable to the serial RJ-45 port of the CDMA
receiver.
b
Connect the other end of the Ethernet cable to the RJ-45 to DB9 adapter.
c
Connect the other end of the cable to the instrument:
–
If using a DMC in an 8000v1 base unit, connect the DB9 adapter to the instru-
ment.
–
If using a CSAM or MSAM with a 6000A or 8000v2 base unit, do the
following:
i. Connect the DB9 end of the RJ-45 to DB9 adapter to the DB9 to USB
cable.
ii. Connect the USB end of the DB9 to USB cable to a USB port on your
instrument.
d
If using a CSAM, connect a SMA to SMA cable from “1PPS” output jack on
the CDMA receiver to a SMA to SMB adapter and then to the CSAM’s “CLK
OUT/1PPS” port.
2
Verify that your instrument is synchronized with GPS time by checking the
CDMA Sync and 1PPS Sync LEDs. When synchronized, the LEDs will be illumi-
nated.
3
Repeat
through
on the second instrument.
The receivers are connected to your instruments, and the instruments are synchronized
with GPS time.
About GPS Receivers
Instruments using the optional TM4-M GPS receiver (instead of CDMA receivers)
communicate directly with the GPS satellite instead of via terrestrial-based radio broad-
cast by the base station. The GPS receiver will establish synchronization by using a
common signal received from a GPS satellite.
The GPS receiver provides accurate ToD and 1PPS signal, which, when averaged over
a long time period, provide very precise signals that can be used to create common
timestamps and as reference clock for other precision system measurements. The GPS
receiver provides a Time of Day (ToD) and a 1PPS signal which are used to generate
accurate time stamps that are encoded into the data transmitted between the local and
remote instruments.
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