EXFO America Inc. FTB-8105 T-Carrier/PDH Transport Blazer Test Module Electrical Interfaces (ENABLED by Default):- DS1/2M (E1) TX/RX: Bantam and RJ-48c connectors- 2M (E1), 8M (E2), DS3/34M (E3),140M (E4): TX/RX BNC connectors- Ext. CLK DS1/2M Input/Output: BNC connector