1. Introduction
This manual provides essential information for the installation, operation, and maintenance of the Cisco WS-SUP720-3B Catalyst Supervisor Engine 720 with PFC3B. This module functions as a control processor, offering Ethernet, Fast Ethernet, and Gigabit Ethernet capabilities. It is designed as a plug-in module for Cisco 7600 Optical Services Routers and Catalyst 6500 series switches.
The Supervisor Engine 720 is a critical component for managing and forwarding network traffic within compatible chassis, providing high performance and advanced features for enterprise and service provider networks.

Figure 1: Top-down view of the Cisco WS-SUP720-3B Supervisor Engine, showing the main circuit board and cooling components.
2. Safety Information
Observe the following safety precautions when installing, operating, or maintaining the Cisco WS-SUP720-3B module:
- Electrostatic Discharge (ESD) Prevention: Always wear an ESD-preventive wrist strap connected to a grounded surface when handling the module.
- Power Disconnection: Ensure the chassis power is off or the module slot is properly prepared for hot-swapping before insertion or removal.
- Weight: The module weighs approximately 11.46 pounds (5.2 kg). Use proper lifting techniques to avoid injury.
- Ventilation: Do not block ventilation openings on the chassis or the module. Ensure adequate airflow for proper cooling.
- Qualified Personnel: Installation and servicing should only be performed by qualified personnel.
3. Setup and Installation
This section outlines the steps for installing the Cisco WS-SUP720-3B Supervisor Engine into a compatible chassis.
3.1 Pre-installation Checks
- Verify that the chassis is powered off or the target slot supports hot-swapping and is prepared for module insertion.
- Ensure the chassis has sufficient power and cooling capacity for the new module.
- Confirm that the chassis software version is compatible with the WS-SUP720-3B. Refer to Cisco documentation for compatibility matrices.
- Gather necessary tools, including an ESD-preventive wrist strap.
3.2 Module Installation
- Wear an ESD-preventive wrist strap and connect it to a grounded surface.
- Locate an available supervisor engine slot in the chassis.
- Carefully align the WS-SUP720-3B module with the guide rails of the slot.
- Gently slide the module into the slot until it makes contact with the backplane connector.
- Push firmly but evenly on the front of the module until it is fully seated.
- Tighten the captive screws on the front panel of the module to secure it in place.
- If the chassis was powered off, power it on. Observe the module's LEDs for initialization status.

Figure 2: Front panel of the Cisco WS-SUP720-3B, illustrating console port, Ethernet ports (Port 1, Port 2), and disk slots (Disk 0, Disk 1).
4. Operating the Module
Once installed and powered on, the WS-SUP720-3B module will begin its boot sequence. The module acts as the central control and forwarding engine for the chassis.
4.1 Initial Configuration Access
- Connect a console cable from a terminal or PC to the CONSOLE port on the front panel of the module (refer to Figure 2).
- Configure your terminal emulation software with the following settings: 9600 baud, 8 data bits, no parity, 1 stop bit, no flow control.
- Follow the on-screen prompts to perform initial setup and configuration of the operating system (Cisco IOS).
4.2 Ethernet Interfaces
The module provides Ethernet, Fast Ethernet, and Gigabit Ethernet interfaces (Port 1, Port 2) for management and out-of-band connectivity. These ports can be configured for network access to the supervisor engine itself.
4.3 LED Indicators
Observe the LEDs on the front panel for status indications. While specific LED behavior can vary with software versions, common indicators include:
- STATUS LED: Indicates the operational state of the module (e.g., green for operational, amber for fault).
- LINK/ACT LEDs: For each Ethernet port, indicates link presence and activity.
5. Maintenance
Regular maintenance helps ensure the longevity and optimal performance of your Cisco WS-SUP720-3B module.
5.1 Cleaning
- Ensure the module is powered off or removed from the chassis before cleaning.
- Use a soft, lint-free cloth to gently wipe the exterior surfaces.
- For stubborn dirt, slightly dampen the cloth with water or a mild, non-abrasive cleaner. Avoid spraying liquids directly onto the module.
- Use compressed air to clear dust from ventilation openings, holding the can upright to prevent propellant discharge.
5.2 Firmware and Software Updates
Periodically check the Cisco support website for the latest software (Cisco IOS) and firmware updates for the WS-SUP720-3B. Keeping the software up-to-date ensures access to new features, performance enhancements, and security patches. Follow Cisco's recommended upgrade procedures carefully.
5.3 Storage
If storing the module, keep it in its original anti-static packaging or an equivalent ESD-safe container. Store in a cool, dry environment away from direct sunlight and extreme temperatures.
6. Troubleshooting
This section provides basic troubleshooting steps for common issues encountered with the WS-SUP720-3B module.
6.1 Module Not Recognized or Not Booting
- Reseat the Module: Ensure the module is fully seated in its slot and the captive screws are tightened.
- Check Chassis Power: Verify that the chassis has power and that the power supplies are functioning correctly.
- Console Output: Connect to the console port and observe boot messages for error indications.
- Compatibility: Confirm that the chassis and its current software version are compatible with the WS-SUP720-3B.
6.2 Link Issues on Ethernet Ports
- Cable Check: Ensure Ethernet cables are securely connected at both ends and are not damaged.
- Port Status: Check the LINK/ACT LEDs on the module's front panel. If no link, verify the connected device is powered on and configured correctly.
- Configuration: Verify the interface configuration on the supervisor engine and the connected device (e.g., speed, duplex settings).
6.3 System Performance Issues
- Resource Utilization: Use CLI commands (e.g.,
show processes cpu,show memory) to check CPU and memory utilization. - Log Messages: Review system logs for error messages or warnings that might indicate a problem.
- Environmental Factors: Ensure the operating environment is within specified temperature and humidity ranges. Check chassis fan status.
For advanced troubleshooting, consult the official Cisco documentation for the Catalyst 6500 or Cisco 7600 series and the WS-SUP720-3B module, or contact Cisco Technical Assistance Center (TAC).
7. Specifications
Key technical specifications for the Cisco WS-SUP720-3B Catalyst Supervisor Engine Management Module:
| Feature | Specification |
|---|---|
| Product Dimensions | 15.75 x 14.57 x 1.57 inches (40 x 37 x 4 cm) |
| Item Weight | 11.46 pounds (5.2 kg) |
| Item Model Number | WS-SUP720-3B= |
| ASIN | B0004HQ19I |
| National Stock Number | 7025-01-609-0506 |
| Control Processor | Supervisor Engine 720 with PFC3B |
| Interface Type | Ethernet, Fast Ethernet, Gigabit Ethernet |
| Form Factor | Plug-in module |
| Compatible Chassis | Cisco 7600 Optical Services Router; Catalyst 6500 series |
| Date First Available | September 10, 2004 |
8. Warranty and Support
Cisco products are typically covered by a limited hardware warranty. The specific terms and duration of the warranty may vary based on your region and purchase agreement. For detailed warranty information, please refer to the official Cisco warranty statements available on their website.
For technical assistance, software downloads, documentation, and service requests, please visit the official Cisco Support website:
It is recommended to register your product with Cisco to receive important updates and support notifications.







