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Viewing Results This section describes how to view, save, recall, and print test results. You can look at test results while a test is running or after it has completed. The CTS850 SDH/PDH Test Set can display test results as a summary or in a more detailed tabular form. The CTS850 also displays measurement history in a graphical format. Press the RESULTS button in the middle of the front panel to call up the RESULTS menus. G.826, M.2101.1, M.2100, and G.821 Analysis G.826 Error Performance By monitoring Severly Errored Seconds (SES) events for both directions at a single path end point, a network provider is able to determine the unavailable state of the path. This service measure is intended for in service quality measurements of 2 Mb/s and above (including SDH rates). G.826 uses block based measurements, that is, multiple errors in a block are counted as one block error. PDH G.826 is based on frame and CRC errors and is an in service measurement. G.826 makes use of block based measurements to get media independent results and thus is more convenient for in service measurement. M.2101.1 This ITU T provides limits for bringing into service (BIS), and limits for maintenance of international SDH paths and international SDH multiplex sections in order to achieve the performance objectives given for a multiservice environment. These objectives include error performance (Recommendation G.826) and unavailability (Recommendation G.827). CTS850 SDH/PDH Test Set User Manual 3 229 Viewing Results M.2100 This measure of service quality is similar to G.821 in that is uses bit based error measurement. M.2100 combines all error sources during a one (1) errored second count without regard to source (for example, FAS, CRC 4, Code violation, etc.). Out of ser- vice measurements use a PRBS pattern, and count bit errors as well as frame related in service error types (for example, FAS, CRC 4). In service measurements count frame related in service error types only (FAS, CRC 4). G.821 analysis is based on pattern bit errors occurring within the payload of an SDH or PDH rate signal. Bit based measurements are made on the payload with a PRBS pattern. G.821 is an out of servicemeasurement since the normal traffic payload is replaced by a test pattern. Viewing a Summary of Results To display a summary of test results: Press Menu Select Menu Highlight Button Page Parameter Select Choice RESULTS TEST SUMMARY none none Figure 3 85 shows the TEST SUMMARY page. The top half of the disp