EXFO America Inc. TK-200-S1-8105-SONET Test kit including FTB-200 Compact Platform - T-Carrier/PDH Transport Blazer Test Module Electrical Interfaces: -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/Ou