ant20 - ber tester setup
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ANT 20 – BER tester setup MOHD AMEEN DIMITY ([email protected])
Optical Network Product Department.
Figure 1
EMS
ODU1
IDU NE1
ODU2
ODU3
ODU4
NE2
IDU
Space attenuation
Space attenuation
BER tester (ANT20)
1. Connect the test circuit as shown in Figure 1 2. Configure services as required by test environment. For SDH, create cross connect as shown in Figure 2. Make the hardware loopback at far end using LC-LC cable at the SDH port on SLI board.
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Figure 2
While for PDH, create cross-connect as shown in Figure 3. Make the hardware loopback at NE 2 (using BNC male jumper cable in that case) at desired port at E1 panel
Figure 3
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RX
TX
TXRX
RX
TX
Figure 4 3. Connect the Tx port of Ant 20 to Rx port of E1 interface as shown in Figure 4 at NE1.
Note that normally for PDH we use the copper cable while SDH we use the fiber cable.
Figure 5
4. Click the Ant-20 icon on the desktop (Figure 5)
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Figure 6
5. There are 3 instruments to be selected normally from the list as follows (Figure 6) :-
Signal structure Performance Analysis Anomaly / Defect Analyzer
Figure 7
6. Refer to Figure 7 at Signal structure window, click to Signal Structure>Edit to setup for either SDH or PDH.
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Figure 8
7. Figure 8 shows the setup for PDH signal structure. Click the button from left to right. Edit : ITU-T Mode : Normal Interface : Electrical PDH : 2M PDH mode : Unfrm. Test Pattern : PRBS15 After click this entire buttons, don’t forget to click Tx Rx button to ensure the same signal go through the system and come back.
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Figure 9
To run the test for 15 minutes, at ANT-20 windows click to Measurement>Setting and set the time to 15 minutes (Figure 9)
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Change to PRBS23
Figure 10
8. Figure 10 shows the setup for SDH signal structure. Edit : ITU-T Mode : Normal Interface : Optical SDH : STM 1 and AU4 Mapping : VC12 PDH : 2M PDH mode : Unfrm. Test Pattern : PRBS23 After click this entire buttons, don’t forget to click Tx Rx button to ensure the same signal go through the system and come back.
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From Figure 11, we can see the difference from PDH setup.
Figure 11
9. Then, perform the BER test for 24 hours. Observe the result for a moment before
leave the test gear running a day. Make sure that the EFS (Error Free Seconds) are counting every seconds as Figure 12 and the others are not counting.
Figure 12
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10. After a day, if no bit error generated, the EFS = 86400 (24hr x 60 min x 60 sec), and the tester stops automatically. Then, go to the tool bar click to Print… to print the result by using a floppy disc.
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10. Here is the example of Passed testing result.
ANT-20 - Performance Analysis 1
Start of measurement: 06/23/08 15:40:18.0
End of measurement : 06/24/08 15:40:18.0
Allocation: 18.50000 %
SES Threshold: 2400 B/s
UAS Limit: 0
G.826: OOS;NEAR END: TSE;
EB;0;;
BBE;0;0.00000 %;
ES;0;0.00000 %;
EFS;86400;100.00000 %;
SES;0;0.00000 %;
UAS;0;;
VERDICT;Accepted;;
PATH ALLOCATION;18.50000 %;;
PATH UAS;0;;