Case Study

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

EMS

Space attenuation ODU1 ODU3 IDU NE2 Space attenuation ODU2 ODU4

IDU NE1

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 .

Connect the Tx port of Ant 20 to Rx port of E1 interface as shown in Figure 4 at NE1.Case Study RX TX TX RX TX RX Figure 4 3. Figure 5 4. 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.

Page 4 of 10 .Case Study Figure 6 5. click to Signal Structure>Edit to setup for either SDH or PDH. 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 the button from left to right. Edit : ITU-T Mode : Normal Interface : Electrical PDH : 2M PDH mode : Unfrm.Case Study Figure 8 7. Page 5 of 10 . 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. Figure 8 shows the setup for PDH signal structure.

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 .

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

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

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

EB.. PATH UAS.0 End of measurement : 06/24/08 15:40:18.Performance Analysis 1 Start of measurement: 06/23/08 15:40:18. SES.100.50000 %.Case Study 10.00000 %..0 Allocation: 18.0.0. ES. PATH ALLOCATION. ANT-20 .00000 %.0.0..0... Page 10 of 10 .0. UAS.0.00000 %. VERDICT.0. BBE. Here is the example of Passed testing result.50000 % SES Threshold: 2400 B/s UAS Limit: 0 G.00000 %.NEAR END: TSE.18. EFS.Accepted.86400.826: OOS.0.