Nokia 9500 MPR User Manual page 1038

Release 7.0.0 3DB 19286 ACAA Issue 01
RF Core Facing Loopback
2. Is RF Core Facing loopback active?
Note: For transceivers supporting the 11 GHz channel plan, the RF filter must be removed
and the connections must be made directly to the MPT-HL shelf connectors.
3. TXMute the local MPT-HL Transceiver card under test, position the TXMute
4. Install external RF loopback connection on the RF filter. See
5. Release TXMute on the local MPT-HL Transceiver card under test, position the
To deactivate a Transmit RF Core Facing Loopback
1. Set the RX Freq(KHz) to the value recorded in
2. Click Apply.
3. Set the Shifter (MHz) to the value recorded in
4. Click Apply.
5. Was external RF loopback connection installed?
6. TXMute the local MPT-HL Transceiver card under test, position the TXMute
7. Remove external RF loopback connection on the RF filter. See
8. Connect the coaxial connections removed during step 4.
9. Release TXMute on the local MPT-HL Transceiver cards, position the TXMute
10. Using the craft terminal, release TXMute the far-end MPT-HL Transceiver cards.
1038
a. If yes, the procedure is complete.
b. If no, then go to step 3.
switch to the OFF position (PA switch set to '0').
a. Connect a coaxial cable to the main antenna connector.
b. Connect the other end of the coaxial cable to a 60 dB attenuator.
c. Connect a second coaxial cable to the other end of the attenuator.
d. Connect the other end of the second coaxial cable to the main or spare Rx
connector.
TXMute switch to the ON position (PA switch set to '1').
The loopback should be active, error-free operation on the test signal. When the
loopback is not active is an indication a problem exists on the transmit portion of
the path.
Facing Loopback.
Facing Loopback.
a. If yes, then go to step 6.
b. If no, then go to step 9.
switch to the OFF position (PA switch set to '0').
switch to the ON position (PA switch set to '1').
WebEML User Manual
Figure 774.
To activate a Transmit RF Core
To activate a Transmit RF Core
Figure 774.