SDH-1620L is an advanced and convenient SDH and PDH transmission analyzer, satisfying all PDH interfaces and STM-1(155M) to stop business and test online.SDH-1620L has unity function, convenient operation and good expansibility，which satisfy the requirement of SDH/PDH transport network and access network installation and maintenance testing
The products satisfy optical fiber installation, maintenance and other testing of SDH ring network, linear triangulation network and star network, which is widely used by operators in private network and other SDH/PDH systems opening and maintenance testing.
Out-of-service testing: remote loopback testing or using two analyzers to perform end-to-end testing
Online testing: Testing trough optical splitters or across the high resistance
BER testing: BER testing for PDH and SDH, performance analysis per G.821, G.826, G.828, G.829, M.2100 and M.2101, automatically compare test results with index directly;
Anomaly and defect testing: Tx end transmitting anomaly and defect events, Rx end receiving anomaly and defect events with records and statistics, recorded events can be displayed in tables or graphics with filtering；
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;
Pointer analysis: generate G.783 pointer and NDF pointer, display pointer value in real-time, record pointer adjustment events including positive, negative and NDF
Switching time measuring: measuring the time under the influence of protecting switchovear
Round trip delay testing: measure the signal transport time from Tx to Rx；
Tributary scan: auto scan each tributary status，optional scan scope
TCM testing: TCM anomaly and defect and message string analysis
Timing and synchronization testing: frequency accuracy testing, pull-in range and pull-out range testing；
Optical power testing: real-time display Tx and Rx optical power
