ST300B ISDN TERMINAL EMULATION TESTER FUNCTIONS: u Automatic, portable and cheap. u Visual status of ISDN line. u Simulate the function of NT+TE. u Directly plug into U interface to transmit, receive and hook. u Enable to test the voltage of U interface, distinguish the faults easily between cable and terminal equipment. u Test the error bit rates of lines accurately to define whether the cable is applicable to the ISDN service or not. SPECIFICATIONS: 1. U interface: Line code: 2B1Q Baud rate: 80kbaud (1B+D) Impedance: 135Q Range: ≤5KM 2. Voice code: A law 3. Protocol: layer two and three are compatible with (internal standard of “ISDN Data Layer Criterion & Measurement Method” and “ISDN Net Layer Criterion & Measurement Method”) ITU-T Q.921 and Q.931. 4. Physical layer: apply to ITU-TQ.961 5. Dial mode: overlap 6. Voltage test range: 12v--96v (in five grades) 7. Battery: 1.2V*4NI-MH 1300mAH rechargeable battery 8. Dimension (mm): 180?90?45 9．Weigh: ≤500g