STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER The **XRT91L30IQ** is a **T1/E1/J1 Line Interface Unit (LIU)** manufactured by **EXAR Corporation**. Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:
### **Specifications:**
- **Interface Standards:** Supports **T1 (1.544 Mbps), E1 (2.048 Mbps), and J1** line rates.
- **Operating Voltage:** **3.3V** (with 5V-tolerant I/O).
- **Package:** **64-pin LQFP (Low-profile Quad Flat Package).**
- **Temperature Range:** **Industrial (-40°C to +85°C).**
- **Compliance:** Meets **ITU-T G.703, G.704, G.706, G.823, and ANSI T1.102, T1.403, T1.408** standards.
### **Descriptions:**
- The **XRT91L30IQ** is a **single-chip LIU** designed for **T1/E1/J1** applications.
- It integrates **transmit and receive functions**, including **clock recovery, jitter attenuation, and line termination**.
- The device supports **both short-haul and long-haul** applications with **programmable line build-out (LBO)**.
- It includes **loopback modes (local, remote, and analog)** for diagnostics.
### **Features:**
- **Integrated Line Termination:** Includes **75Ω (E1) and 100Ω (T1/J1)** line termination.
- **Jitter Attenuation:** On-chip **jitter attenuator** with **selectable bandwidth**.
- **Programmable LBO:** Adjustable **line build-out** for different cable lengths.
- **Diagnostic Functions:** Supports **BERT (Bit Error Rate Test)**, **loopbacks**, and **alarm detection**.
- **Low Power:** Optimized for **low-power operation** in industrial applications.
- **Flexible Clocking:** Supports **multiple clocking modes**, including **master/slave** configurations.
This information is sourced from **EXAR's official datasheet** for the **XRT91L30IQ**.
