Overview: The SDH-1620L is an advanced and handheld SDH/PDH transmission analyzer, which integrates in-service monitoring and out of service testing of E1/E3/E4, DS1/DS3, and STM-1 into one package. Being highly affordable, easy-to-use and scalable, this powerful unit is ideal for installation and maintenance testing over the SDH/PDH transmission and access networks. Functions: O BERT: BERT test for PDH and SDH, directly and automatically compare the test results with standards. O Error performance analysis: ITU-T G. 821, G. 826, G. 828, G. 829, M. 2100, M. 2101 O Anomaly and defect testing: Tx-end transmitting anomaly and defect events, Rx-end receiving anomaly and defect events with record and statistics. Recorded events can be displayed in tables or graphics with filtering. O Overhead testing: Overhead emulating transmission and receiving analysis includes two parts. General part (including J0/J1/J2/S1/V5/C2) and extended part (all the remaining overhead bytes except A1/A2, B1/B2/B3). O Pointer monitoring: Generate G. 783 pointer and NDF pointer. Display pointer value in real-time. Record pointer adjustment events (positive, negative and NDF). O APS timing measurement: Measure the network switchover time. O Round trip delay testing: Measure the signal transport time from Tx to Rx. O Tributary scan: Auto scan each tributary with the range optional. O Timing and synchronization testing: Frequency accuracy test. Pull-in range and pull-out range test. O Real-time optical power testing. O Voice monitoring: Able to select any channel of SDH/PDH. Features: O Easy operation: 10.4''TFT touch screen, visible graphic display. O Simulated indicators: For current and history alarm and error status. Indicator quantities and types can be automatically set based on tested signals and interface settings. O Multi-task testing: Multiple tasks can be created and deleted dynamically and freely. O Clock interfaces: External clock Tx & Rx interfaces. O Events record: Large capacity for recording bit error and alarm events, Events can be displayed in tables or graphics with filtering. O Data management: Test results may be saved as HTML or TXT format or exported to U-disk or PC for viewing and printing.