Additional Features: Return-to-zero (RZ) measurement 50 GHz bandwidth electrical channel 2.5/12.5 GHz trigger channel (set by mainframe) The Agilent 86109B module provides the highest combination of optical and electrical bandwidth required for testing beyond 10 Gb/s. The electrical channel has 50 GHz bandwidth and the optical channel has 40 GHz of bandwidth. 40 GHz of unfiltered optical bandwidth is essential now that return-to-zero (RZ) modulation formats are being used in 40 Gb/s transmission systems under development.