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AS4000 Subscriber Terminal

Installation and Commissioning DLP 016

605-0000-436

Issue 1.5 Date: 18th October 1999

Page 2 of 4

1. Disconnect the drop cable from the CRU and connect the CRU Generic Test Cable

to the CRU. Connect the other end to the drop cable.

2. If the CRU has not been programmed Program the CRU (See DLP-014)

3. Once programmed, the ST will automatically attempt to establish an RF link with

the respective CT. The link shall acquire within 5 minutes.

4. If unable to acquire link it will continue attempting to do so until power is

removed. If the link fails to acquire check that the CRU is facing the general

direction of the CT and that the CT is operational.

5. Once the R.F. link between the ST and CT has been successfully established the RF

link fail LED on the CT modem will be extinguished In the AC PSU (type 2/4) D9

will be extinguished.

CRU Panning

1. Using the DMM, Using the DMM, measure the DC voltage between Ground

(green) and the AGC Monitoring point, (red) on the Generic Test Cable. The

voltage measured is a relative indication of the received signal strength; The lower

the voltage the weaker the RX signal, and vice versa.

2. Whilst observing the voltage on the DMM, pan the CRU through the peak point,

then pan back to it. If there is not sufficient panning range use the other mounting

point on the CRU mounting bracket in order to pan through the peak.

3. Using a 17mm spanner or socket torque the pivot bolts to 25nm.

CRU Characterisation

Each CRU has a characterisation label fixed to the CRU back plate. This label

records factory measured readings of TX PC and RX AGC Volts for different set

levels.

AGC Voltage Recording

1. Lock and secure the CRU in position by tightening the locking bolts on the CRU

mounting bracket.

2. Using the DMM, measure the DC voltage between Ground (green) and the AGC

Monitoring point, (red) on the Generic Test Cable.

3. Check the label on the CRU to get an indication of the receive signal strength from

the characterised readings to ensure that the required fade margins are attained; The

higher the voltage the stronger the signal. The receive signal strength should be

better than –98dBm for a viable link.