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Gigabit Ethernet – IEEE 802.3z The Choice of a New Generation Design Presentation

Gigabit Ethernet – IEEE 802.3z The Choice of a New Generation Design Presentation. ECE 4006c G2- Gigabit Ethernet Intel/Agilent TX Javier Alvarez, gte006r Astou Thiongane, gt3083a Ebrima Kujabi, gte212s. Objectives. General Use MAXIM 3287 Kit Board Specs Basic Features

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Gigabit Ethernet – IEEE 802.3z The Choice of a New Generation Design Presentation

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  1. Gigabit Ethernet – IEEE 802.3zThe Choice of a New GenerationDesign Presentation ECE 4006c G2- Gigabit Ethernet Intel/Agilent TX Javier Alvarez, gte006r Astou Thiongane, gt3083a Ebrima Kujabi, gte212s

  2. Objectives • General Use • MAXIM 3287 Kit • Board Specs • Basic Features • Component Analysis • Safety Features • Issues with Laser Mounting • Testing Procedures • Design Board

  3. General Use of MAXIM board • Remove transceiver Module from Intel PRO/1000 Board. • Replace transmitter with MAXIM 3287 • Optical Transmitter Module

  4. Board Specs • Basic Features • Optimized operation at 1.25 Gbps. • Supports a current modulation up to 30mA. • Deterministic Jitter of approx. 22 ps. • Requires a 3.3 V to 5V power supply.

  5. Component Analysis • Differential Input & Output • Eliminates noise in channel • Reference Voltage • Used for programming a laser bias current in VCSEL applications (~0.8mA) • Monitor Diode • Monitors Laser Current • Not supported by board

  6. Component Analysis (Cont’d) • Current Modulation Control (Pin 15) • Temperature Coefficient Control (Pin 16)

  7. Laser Mounting • VCSEL Mounting • Common-Cathode Configuration • Avoiding Laser Ringing or Overshooting • Reduce Length of Leads • Typical Package Leads have inductances of 25nH/in.

  8. Common-Cathode Configuration

  9. Safety Features • Shutdown Driver Output (SHDNDRV) • Power-On Reset (POR) • Resets Laser when turned off. • Rejects Noise caused by VCC during power-on or hot plugging. • Bias Controlling Transistor Driver (BIASDRV) • Transistor placed between BIASDRV and VCC • Ensures Low Noise Operation • Rejects Power Supply Noise • Decoupling Capacitors at VCC & GND

  10. Testing Procedures • The Eye Mask from IEEE 802.3z • Distinction between logical 1 and 0 • Allows to see amount of jitter • Bit Error Testing • Tektronic BERT • Testbed

  11. Board Design • Parts List Consists: • VCSEL (~850 nm) • SMA Connectors • SMA Cable • Resistors • Capacitors • Inductors • 3 to 5 Volt Power Supply Picture provided by: http://www.ece.gatech.edu/academic/courses/fall2001/ece4006/1G2/

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