Test without 2nd RF generator
HOW?
Set the RF level in the MAHO test mask to –60 dBm.
Enter the no. of an adjacent channel in the field 2nd DTC.
Enter the DTC RF band for 2nd RF channel.
Start the test with
{CONTIN}
.
{1-SHOT}
is only useful for a
remotely controlled measurement.
Decrease RF level in the MAHO test mask and look for
the test results. Increase RF level to approx. –20 dBm
and look for the test result 2nd RSSI.
End the test with
{STOP}
.
{RETURN}
takes you back to the basic test mask.
Test Results
D
RESULt6 Current BER Bit error rate of mobile in current DTC. Display may
only show > 0 for very small RF levels < –110 dBm
(see Table B).
RESULt7 Current RSSI RF signal level of mobile in current DTC. Display
may show 0 to 31 (see Table A).
RESULt8 2nd RSSI At very high RF signal level, noise spectrum of test
set provokes "measured figures" in adjacent chan-
nel.
Table A
Table B
Shown RSSI Real RSSI Shown BER Real BER (%)
1 –113 dBm or less 0 < 0.01
2 –111 dBm 1 0.01 to less than 0.1
3 –109 dBm 2 0.1 to less than 0.5
4 –107 dBm 3 0.5 to less than 1.0
... ... 4 1.0 to less than 2.0
... ... 5 2.0 to less than 4.0
30 – 53 dBm 6 4.0 to less than 8.0
31 – 51 dBm or greater 7 ≥ 8.0
RSSI and BER according to specification IS-54-B (tolerances: RSSI
±
±±
±3 to ±
±±
±5 dB,
BER ±
±±
±25%)
Fig. 10.26: MAHO test mask showing field
strength (RSSI) and bit error rate (BER) in
traffic channel (Current DTC) as well as
field strength in selected adjacent channel
(2nd DTC). While testing it is possible to
observe effect of change in level (by
RF Level field) on measured figures.
IS-136 MS Mobile-Assisted Handoff (MAHO)
10-44
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