Meinberg IMS-M1000, Руководство пользователя

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11.8.22.1 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 LIU - Line Interface Unit can be achieved.
134 Date: 27th May 2021 IMS - LANTIME M4000