4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT The XRT73L04AIV is a quad T1/E1/J1 Line Interface Unit (LIU) manufactured by Exar Corporation. Below are the key specifications, descriptions, and features based on the available knowledge:
### **Manufacturer:**
Exar Corporation (now part of MaxLinear)
### **Description:**
The XRT73L04AIV is a highly integrated quad T1/E1/J1 Line Interface Unit designed for telecommunications and networking applications. It provides a complete physical layer solution for T1 (1.544 Mbps), E1 (2.048 Mbps), and J1 (Japanese standard) interfaces.
### **Key Features:**
1. **Quad-Channel LIU:** Supports four independent T1/E1/J1 transceivers in a single chip.
2. **Compliance:** Meets ITU-T G.703, G.704, G.706, G.732, G.823, and ANSI T1.102, T1.403 standards.
3. **Line Interface:**
- Supports both short-haul and long-haul applications.
- Integrated line termination resistors.
- Adjustable transmit and receive pulse shapes.
4. **Jitter Attenuation:** On-chip jitter attenuators for both transmit and receive paths.
5. **Diagnostics & Monitoring:**
- Loopback modes (local, remote, analog).
- Loss of Signal (LOS), Loss of Frame (LOF), and Remote Alarm Indication (RAI) detection.
6. **Clock Recovery:** On-chip clock recovery for each channel.
7. **Power Supply:** Operates from a single 3.3V supply.
8. **Package:** 128-pin TQFP (Thin Quad Flat Package).
9. **Temperature Range:** Industrial (-40°C to +85°C).
### **Applications:**
- T1/E1/J1 line cards
- Digital cross-connect systems
- Routers and access concentrators
- VoIP gateways
This information is based on the manufacturer's datasheet and technical documentation. For detailed electrical characteristics and timing diagrams, refer to the official datasheet.
