BT8954中文资料CONEXANT数据手册PDF规格书

The Bt8954 framer has been tailored specifically to meet the needs of voice pair gain systems (also referred to as “cable relief systems” and “digital subscriber line carriers”) by providing a direct connection to the DSL modem and the CODEC.

Distinguishing Features

• Voice Pair Gain Framer

– Frames and transports PCM data streams over 12–18,000 ft. (3.7–5.5 km) distances when coupled with Bt8960 or Bt8970

• PCM Interface

– Supports popular PCM codecs

– Programmable payload to support 2–18 64 kbps voice channels

– 2.048, 1.536 MHz PCM reference clock generation

– 6.144, 8.192, 20.48 MHz ADPCM reference clock generation

• DSL Interface

– Connects to Bt8960 or Bt8970

– Supports 160–1168 kbps bit rates

– Error performance monitoring

– Auto tip/ring reversal

• Microcomputer Interface

– Glueless interface to Intel 8051 and Motorola 68302 processors

– Access to overhead and signaling registers

• Supports ADPCM codecs (32 kbps)

• PCM and DSL loopbacks

• CMOS technology, 5 V operation

• Low-power operation

– Enables compatibility with line-powered systems

• 68-pin PLCC

• JTAG/IEEE Std 1149.1-1990

• –40 °C to +85 °C operation

Applications

• Voice Pair Gain Systems (Clear)

– PCM2, PCM4(PCM1+3), PCM6,

– PCM8, PCM10/11, PCM12, PCM18

• ADPCM Voice Pair Gain Systems (Compressed)

– ADPCM12, ADPCM24, ADPCM36