The magazine for ANT-20 users ± The standard test platform for PDH, SDH, SONET and ATM PVC/SVC networks

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1 Issue Number The magazine f ANT-0 users ± The standard test platfm f PDH, SDH, SONET and ATM PVC/SVC netwks Dear Reader: Here it is, the first issue of our new newsletter. It s intended to provide infmation about upgrades and new releases directly to users of the ANT-0 Advanced Netwk Tester (a rapidly growing circle!). Insider tips and suggestions on configurations and instrument usage are included as well. Background info is here too, but brevity is our motto. If you d like to be on our mailing list, let us know via (ant.news@wago.de) with the enclosed fax fm. Please give us an idea of what you hope to see in future issues. We intend to make Advanced Netwk Testing your newsletter! Jochen Hirschinger Wandel & Goltermann Marketing, Division Available in nd Quarter of 998: ªBlock and Replaceº, upgrade ªTandem Connection Monitingº, upgrade ªOC-c/STM-cº, new options Settings and Results: With Save, Expt & Print, You've Got Every Stage Capability Imaginable Fast Overview: With Auto-Configuration, Scan, Trouble Scan and Search, You Can Come to Terms with a Complex System Fast! Alarm Senss: ANT-0 Uses Dynamic Alarms To Test Actual Threshold Values Signal Running Late? ANT-0 Measures Delay Perfmance Moniting: CATS Test Sequences Automatically Check System G.8/G.86 Senss Available in nd Quarter of 998: ªBlock and replaceº, update This is an extension of the ANT-0's Drop & Insert Option. It makes it possible to replace a synchronous tributary in a synchronous signal. The received tributary is analyzed (ªblockº). The SOH, POH and high-der payload of the synchronous tributary (AU-3 AU-) are what is replaced (ªreplaceº). As the payload, 0 Mbit/s, 3 Mbit/s, Mbit/s, BULK signals ATM cells can be chosen, depending on the options. Errs and alarms can also be inserted into the SOH, POH and payload. ªTandem Connection Monitingº, update This is an extension of the ANT-0's Extended Overhead Analysis Option. This function enables recding of the N/N bytes with the Capture Function; the bytes can then be evaluated.

2 The data stream can be checked f errs and alarms and an err source isolated in this manner. ªTandem Connection Monitingº is available f all of the mappings built into the ANT-0. The ANT-0 allows access to SDH and SONET systems up to. Gbit/s. ªOC-c/STM-cº, new options Today's broadband driving fces (such as the Internet) are leading to construction of netwks offering transmission capacities of 600 Mbit/s. With the OC-c/STM-c options, we are expanding the main applications and functions of the ANT-0 f new signal structures. Three options are available as of May '98:. OC-c/STM-c BERT (contiguous concatenation). OC-c/STM-c ATM testing. OC-c/STM-c virtual concatenation Settings and Results: With Save, Expt & Print, You've Got Every Stage Capability Imaginable ANT-0E used as ATM tester at German netwk provider ªtesionº. Me about broadband applications in our next issue of Advanced Netwk Testing. The ANT-0 has sophisticated stage and printing facilities, making it easy to create test documents. Applications ªsave asº saves the current application including instrument setup and Virtual Instruments (VIs) but without test results to c:\ (application library on internal hard disk) a:\ (floppy disk). An internal data fmat is used (.apl). ªopenº loads the instrument setup from c:\(application library) a:\ and sets the ANT-0. ªexptº expts one me saved applications (instrument setup & VIs without test results) to a:\. Internal fmat (.apl). ªimptº impts one me applications from a:\ to c:\ (application library). Test results ªsave results asº saves the test results on c:\ a:\ with associated instrument setup and loaded VIs. Internal fmat (.ara). ªload resultsº loads saved test results from c:\ a:\ with associated instrument setup and VIs. Internal fmat (.ara). You can activate Expt and Print functions in the following test VIs: Anomaly/Defect Analyzer, ATM Traffic Analyzer, Jitter Analyzer, Pointer Analyzer, Perfmance Analysis. You will find them under the ªPrintº button. ªexptº expts test results to c:\ a:\ without associated instrument setup. The fmat is.csv (comma separated values). This ASCII-compatible fmat is easy to impt into Excel WinWd, making it a snap to create test documents. In addition,.csv wander data (TIE) from the Jitter Generat/Analyzer VI can be impted into the MTIE/TDEV Offline Software. ªprintº outputs test results directly to the external printer. Use the printer menu to modify parameters.

3 Fast Overview: With Auto-Configuration, Scan, Trouble Scan and Search, You Can Come to Terms with a Complex System Fast! With its automated measurement facilities, the ANT-0 can be used to gain a rapid overview of complex systems. Examples: Unknown signal structure? Auto-Configuration recognizes standard PDH and SDH signals and the payload content on balanced/coaxial electrical and optical interfaces. Once detected, a keypress automatically sets the receiver to the structure. Faulty cross-connection? Scan automatically verifies err-free cross-connection of channels in synchronous netwk elements. The ANT-0 checks one channel after another f proper connection (out-of-service). At the same time, the instrument checks f alarms and pattern synchronization and marks faulty channels in a matrix. Where is the alarm? Trouble Scan checks one channel after another in synchronous netwks f alarms (in-service). The ANT-0 displays detected errs in a table f each erred channel. Where's the channel? Search locates displaced channels in synchronous DXCs and s. The ANT-0 receiver searches all of the channels in an STM- signal f the transmitted test signal. The result is displayed in a matrix. The ANT-0 TX channels are not thru-connected. Search mode Channels Test 3 Scan mode ANT-0 Tx Channels ANT-0 Rx ANT-0 Rx Trouble Scan mode 3 ANT-0 Rx Alarm Senss: ANT-0 Uses Dynamic Alarms To Test Actual Threshold Values In plesiochronous and synchronous netwks, errs and decreasing perfmance are indicated using various alarms, generated by built-in senss. The alarm messages are transmitted in the overhead bytes. But what happens if bit errs occur in the overhead itself? To prevent spadic errs from falsifying alarms, the message is recognized only if it is received several times in succession. Example: MS-AIS is active, if 3 successive frames of the K byte are ``º. MS-AIS is passive, if 3 successive frames of the K byte are ``0º. To test this complex alarm structure, the ANT-0 provides ``dynamic alarmsº. This means that the alarm is set f a precise number of frames a precise time ± and then removed. This is a way to precisely test sens thresholds. Parameters: Frames: M (active frames) to N-, N (all frames) to 800. Time: t (active time) 0. to 60 s, t (passive time) 0. to 600 s.

4 Signal Running Late? ANT-0 Measures Delay Delay measurements are used to line up satellite links, test the maximum allowable delay in buffered crossconnect systems and check loop circuits in regenerats. As part of such measurements, the transmission circuit is looped back at the far end. The ANT-0 transmits a test pattern and measures how long it takes to make its way back to its receiver. In this measurement, test patterns are inserted into the selected channel, into the container of the SDH signal into the selected channel of the lowest level system f PDH signals. To avoid ambiguities, two test durations can be set, depending on the expected delay. The delay measurement function is available in the ANT-0 starting with version.0. The measurement can be activated in the ``Signal Structure Editº window under ``Autoº / ``Delay measurementº. Time measurement Example: Measuring signal delay caused by long transmission links loop Perfmance Moniting: CATS Test Sequences Automatically Check System G.8/G.86 Senss In der to test Perfmance Moniting (PM) senss, it is necessary to generate a precisely defined scenario of signal degradations and defects and then compare the reaction of the device under test with the reaction specified in the recommendation ± a job that the CATS Test Sequencer simplifies considerably. The picture below shows a typical test sequence as can be generated on the ANT-0 with the CATS Test Sequencer. The method f generating customerspecific G.86 stimulus sequences is very simple: After setting the desired signal structure (e.g. STM- C), a scenario with any desired degree of complexity can be created based on periods with fixed err rates, alarms, defects and cresponding periods with a ``goodº signal. All aspects of the PM senss can be tested in this manner, using just a single, predefined test sequence. Examples of such tests include proper detection of the ES/SES thresholds, proper detection of the unavailable time, proper switch-over to the available state, detection of all defects/anomalies defined in the recommendation, and so on. STM-N OC-N A A D ES EFS SES SES SES/UAS Measurement interval Element manager G.86 Senss DUT Besides the pure stimulus test cases used here, the ANT-0 CATS Test Sequencer also offers the capability of perfming complete stimulus/response tests. A specific alarm stimulus (LOS, LOF, excessive B//3 err rate, etc.) is inserted, and the ANT-0 verifies on its RX end whether the expected alarms are received (MS-RDI, AU-AIS, RDI, etc.). A = Anomaly D = Defect Published by: Wandel & Goltermann GmbH & Co. Elektronische Meûtechnik Postfach 6, 779 Eningen u.a. Edit-in-chief: Burkhard Braach Tel , Fax , burkhard.braach@wago.de Printed in Germany Queries and subscription requests to: ant.news@wago.de

5 Feedback/Subscription (free of charge) Advanced Netwk Testing Fax to I'd like to receive ªAdvanced Netwk Testingº regularly. Please add my name to your mailing list. Name: Company: Dept.: Address: Tel./Fax/ Tell us what you think! Article ranking, issue no. Very interesting Moderately interesting Bing Comments The publication in general Available Upgrades and Options Settings and Results... Stage Facilities Fast Overview: Auto-Configuration Alarm Senss: Testing with Dynamic Alarms... Signal Running Late? ANT-0 Measures Delay Perfmance Moniting: CATS Test Sequences... What topics would you like to see me of in ªAdvanced Netwk Testingº? Other comments: