DS2148数据手册集成电路（IC）的电信规格书PDF

描述 Description

The DS2148 is a complete selectable E1 or T1 Line Interface Unit (LIU) for short- and long-haul applications. Throughout the data sheet, J1 is represented wherever T1 exists. Receive sensitivity adjusts automatically to the incoming signal and can be programmed for 0dB to 12dB or 0dB to 43dB for E1 applications and 0dB to 30dB or 0dB to 36dB for T1 applications. The device can generate the necessary G.703 E1 waveshapes in 75Ω or 120Ω applications and DSX-1 line build outs or CSU line build outs of 0dB, -7.5dB, -15dB, and -22.5dB for T1 applications. The crystal-less onboard jitter attenuator requires only a 2.048MHz MCLK for both E1 and T1 applications (with the option of using a 1.544MHz MCLK in T1 applications). The jitter attenuator FIFO is selectable to either 32 bits or 128 bits in depth and can be placed in either the transmit or receive data paths. An X 2.048MHz output clock synthesized to RCLK is available for use as a backplane system clock (where n = 1, 2, 4, or 8). The DS2148 has diagnostic capabilities such as loopbacks and PRBS pattern generation/detection. 16-bit loop-up and loop-down codes can be generated and detected. The device can be controlled via an 8-bit parallel muxed or nonmuxed port, serial port or used in hardware mode. The device fully meets all of the latest E1 and T1 specifications including ANSI T1.403-1999, ANSI T1.408, AT&T TR 62411, ITU G.703, G.704, G.706, G.736, G.775, G.823, I.431, O.151, O.161, ETSI ETS 300 166, JTG.703, JTI.431, JJ-20.1, TBR12, TBR13, and CTR4.

特性 Features

• Complete E1, T1, or J1 line interface unit (LIU)
• Supports both long- and short-haul trunks
• Internal software-selectable receive-side termination for 75Ω/100Ω/120Ω
• 5V power supply
• 32-bit or 128-bit crystal-less jitter attenuator requires only a 2.048MHz master clock for both E1 and T1 with option to use 1.544MHz for T1
• Generates the appropriate line build outs, with and without return loss, for E1 and DSX-1 and CSU line build outs for T1
• AMI, HDB3, and B8ZS, encoding/decoding
• 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz clock output synthesized to recovered clock
• Programmable monitor mode for receiver
• Loopbacks and PRBS pattern generation/ detection with output for received errors
• Generates/detects in-band loop codes, 1 to 16 bits including CSU loop codes
• 8-bit parallel or serial interface with optional hardware mode
• Multiplexed and nonmultiplexed parallel bus supports Intel or Motorola
• Detects/generates blue (AIS) alarms
• NRZ/bipolar interface for TX/RX data I/O
• Transmit open-circuit detection
• Receive Carrier Loss (RCL) indication (G.775)
• High-Z State for TTIP and TRING
• 50mA (rms) current limiter

简介

DS2148属于集成电路（IC）的电信。由制造生产的DS2148电信电信接口集成电路 (IC) 为通信网络接口提供特定功能和控制，例如以太网切换、线路驱动器、ISDN、放大器、通道扩展器、数字锁相环、DTMF、音频发生器和解码器、回声消除、检测器和发生器、DDA、电话线路监控器和主叫号码标识。