ISDN When this LED is lit, it indicates that the ISDN S0 bus is activated. It will flash when there is message transfer in the D channel. B1 When this LED is lit, it indicates that the ISDN B1 channel is being accessed. It will flash when there is data transfer in the B1. B2 When this LED is lit, it indicates that the ISDN B2 channel is being accessed. It will flash when there is data transfer in the B2. tiny USB ISDN TA128 Installing the tiny USB ISDN TA128 Connect your ISDN line to the ISDN S0

Package Contents • One USB ISDN TA128 • One USB ISDN TA128 installation CD with drivers and utility software • One CD with bundled application software programs (optional) • One RJ-45 ISDN cable • One USB cable • This quick start guide The Front Panel LEDs USB When this LED is lit, it indicates that the USB port is connected to the PC and working properly. ISDN When this LED is lit, it indicates that the ISDN S0 bus is activated. It will flash when there is message transfer in the D channel. B1