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Case Study

ANT 20 – BER tester setup
MOHD AMEEN DIMITY (mohdameen@huawei.com)
Optical Network Product Department.

EMS
Space
attenuation
ODU1 ODU3

IDU
IDU
NE2
NE1 Space
attenuation
ODU2 ODU4

BER tester (ANT20)

Figure 1

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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Case Study 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 Page 2 of 10 .

Click the Ant-20 icon on the desktop (Figure 5) Page 3 of 10 . Note that normally for PDH we use the copper cable while SDH we use the fiber cable. Case Study RX TX TX RX TX RX Figure 4 3. Connect the Tx port of Ant 20 to Rx port of E1 interface as shown in Figure 4 at NE1. Figure 5 4.

There are 3 instruments to be selected normally from the list as follows (Figure 6) :- z Signal structure z Performance Analysis z Anomaly / Defect Analyzer Figure 7 6. click to Signal Structure>Edit to setup for either SDH or PDH. Refer to Figure 7 at Signal structure window. Case Study Figure 6 5. Page 4 of 10 .

Page 5 of 10 . Figure 8 shows the setup for PDH signal structure. Test Pattern : PRBS15 After click this entire buttons. Edit : ITU-T Mode : Normal Interface : Electrical PDH : 2M PDH mode : Unfrm. Click the button from left to right. don’t forget to click TxÆRx button to ensure the same signal go through the system and come back. Case Study Figure 8 7.

Case Study 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) Page 6 of 10 .

Figure 10 shows the setup for SDH signal structure. Case Study Change to PRBS23 Figure 10 8. Edit : ITU-T Mode : Normal Interface : Optical SDH : STM 1 and AU4 Mapping : VC12 PDH : 2M PDH mode : Unfrm. don’t forget to click TxÆRx button to ensure the same signal go through the system and come back. Page 7 of 10 . Test Pattern : PRBS23 After click this entire buttons.

perform the BER test for 24 hours. Then. Case Study From Figure 11. Make sure that the EFS (Error Free Seconds) are counting every seconds as Figure 12 and the others are not counting. we can see the difference from PDH setup. Figure 11 9. Figure 12 Page 8 of 10 . Observe the result for a moment before leave the test gear running a day.

go to the tool bar click to Print… to print the result by using a floppy disc. Case Study 10. and the tester stops automatically. the EFS = 86400 (24hr x 60 min x 60 sec). Page 9 of 10 . if no bit error generated. After a day. Then.

86400.0.0.0 End of measurement : 06/24/08 15:40:18.Performance Analysis 1 Start of measurement: 06/23/08 15:40:18. Case Study 10. Page 10 of 10 ..Accepted. SES. ANT-20 . UAS.0.0..00000 %. EB.18.50000 %.0 Allocation: 18. VERDICT..0. Here is the example of Passed testing result.NEAR END: TSE.00000 %.826: OOS.0. PATH ALLOCATION. EFS. PATH UAS.100. BBE.0. ES..0.50000 % SES Threshold: 2400 B/s UAS Limit: 0 G.00000 %.00000 %.0..