DS21Q48 Datasheet

5V E1/T1/J1 Line Interface Unit


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 0dBto 36dB for T1 applications. The device can generate the necessary G.703 E1 waveshapes in 75Ωor 120Ωapplications and DSX-1 line built-outs or CSU line built-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 or128 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. DS21Q48 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 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


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Manufacturer information


ON Semiconductor - ON Semiconductor (Nasdaq: ON) is driving energy efficient innovations, empowering customers to reduce global energy use. The company offers a comprehensive portfolio of energy efficient power and signal management, logic, discrete and custom solutions to help design engineers solve their unique design challenges in automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace and power supply applications. ON Semiconductor operates a responsive, reliable, world-class supply chain and quality program, and a network of manufacturing facilities, sales offices and design centers in key markets throughout North America, Europe, and the Asia Pacific regions.

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