12.8.19.1 IMS-LIU Telecom Output Signals
The board LIU (Line Interface Unit) was designed to convert the GNSS-locked standard frequency of a pre-
connected Meinberg satellite controlled clock (GPS or GPS/GLONASS/Galileo/BeiDou) into several timing
signals that can be used for various synchronization or measurement tasks.
Typical applications are:
•
Measurement and test of synchronization quality of Telecom networks
•
Calibration and synchronization of laboratory equipment
•
Test of synchronization of radio transmitters / base stations (GSM / CDMA / UMTS / DAB / DVB)
3.
T1
4.
E1
(green/red = on/off)
(green/red = on/off)
unsymm. /
unbalanced
Pinbelegung /
Pin assignment
:
1:
TRING ,
2:
TTIP (LIU-A)
8:
TRING ,
7:
TTIP (LIU-E)
5:
TRING ,
4:
TTIP (LIU-T)
symm. /
balanced
1
2
4 5
7 8
There are two separate signal paths on the board LIU. One is for providing the standard frequencies, the
second path is for generation of the "telecom-signals". All output signals have high accuracy and stability
because they are derived from the internal receiver’s disciplined standard frequencies generated by the pre-
connected satellite clock. Depending on the oscillator option of the internal receiver, the accuracies which are
described in chapter
can be achieved.
86
Date: 21st August 2019
IMS-M4000
