Profile: TranSwitch Corp. specializes in manufacturing semiconductors for use in telecommunications and data communications equipments. The ADMA-E1 device is designed for add/drop multiplexer, terminal multiplexer, dual & single unidirectional ring applications. Two E1 2048 kbit/s signals are mapped to and from asynchronous tributary unit - 12s (TU-12s). The ADMA-E1 interfaces to a multiple-segment, byte-parallel, SDH VC-4 formatted bus at the STM-1 byte rate. The E1 2048 kbit/s signals can be either HDB3 positive/negative rail- or NRZ-formatted signals. The ADMA-E1 provides performance counters, alarm detection, and the ability to generate errors and alarm indication signals (AIS). Loopback capability is also provided. The DS3F framer device is designed for DS3 framer applications in which broadband payloads are mapped into the 44.736 Mbit/s DS3 frame format. Although the C-bit parity format is recommended, the DS3F can also operate in the M13 mode. In the C-bit parity format, the DS3F provides a separate interface for selected C-bits. The DS3F also provides for transmitting and receiving the FEAC channel and blue code AIS conditions, and generates and detects DS3 AIS, DS3 idle, P-bit parity and C-bit parity. In addition, performance counters are provided, as well as the ability to generate single framing, FEBE, C-bit parity and P-bit parity errors. The device also provides X-bit inversion, receive loop timing and indications for FEAC idle channel, FEAC word stack overflow and severely errored frame. The payload interface is selectable through software as either a bit-serial or nibble-parallel format.