3COM 8807 (01) PDF Document

The guide for the 3COM 8807 uses the following conventions:

Icon Conventions

Text Conventions

The specifications for the AC PSUs for the 3COM 8807 are as follows:

Please observe the following safety recommendations when working with the 3COM 8807:

General Safety:

• The 3COM 8807 uses redundant PSUs. Turn off all PSUs and remove all power cords before opening the chassis.

• Keep the chassis clean and dust-free.

• Keep the chassis and installation tools away from walk areas.

Electrical Safety:

• Check your work area for hazards like ungrounded power extension cables, missing safety grounds, and moist floors.

• Locate the emergency power-off switch in the room before you begin installation.

• Unplug all power cords and external cables before moving the chassis.

• Do not perform maintenance on the equipment alone while it is powered.

• Always verify that power has been disconnected from a circuit; never assume.

• Do not place the switch on a moist surface and prevent liquids from flowing into it.

Moving the Switch:

• The 3COM 8807 is heavy. Remove all external cables before moving the chassis.

• Do not move the switch alone. Work with another person.

• Move the switch slowly and stably, avoiding sudden movements or twisting your body.

• Move the switch at a stable pace with your partner, maintaining balance.

• CAUTION: Only hold the handles on the sides of the chassis when moving the switch. Do not use the plastic panel, fan frame handle, PSU handles, or air vents, as they are not designed to bear the weight of the chassis.

Laser Safety:

• Some I/O modules have optical interfaces. Do not stare into an open optical interface, as the laser can be harmful to your eyes.

To prevent electrostatic discharge (ESD) damage to the electronic components of your 3COM 8807, follow these steps:

Step 1: Wear the wrist strap on your wrist.

Step 2: Lock the wrist strap tightly to ensure good contact with your skin.

Step 3: Insert the strap’s connector into the dedicated ESD hole in the chassis or attach its alligator clip to a grounding screw on the chassis.

Step 4: Make sure the ESD-preventive wrist strap is well grounded. The resistance reading between your body and the ground should be in the range of 1 to 10 Mohm.

Always hold circuit boards by their edges and avoid touching the components directly.

The 3COM 8807 must be used indoors. The installation site should meet the following requirements:

Temperature/Humidity:

• Operating Temperature: 0 to 40°C (32 to 104°F)

• Operating Humidity (noncondensing): 10% to 90%

• Storage Temperature: -10 to 70°C (14 to 158°F)

• Storage Humidity: 10% to 90%

Cleanness:

• Dust particle concentration should be ≤3 x 10^4 particles/m³ (with a diameter ≥ 5µm), which means no visible dust on a desk in three days.

• Harmful gases like SO₂, H₂S, NO₂, NH₃, and Cl₂ should be kept within specified limits to prevent corrosion and material aging.

Anti-Static and Grounding:

• The site should have measures to prevent interference from electrical nets, radio launchers, and high-frequency devices.

• A reliable grounding system is essential for stable operation, lightning protection, and ESD prevention. The resistance between the switch chassis and the ground must be less than 1 ohm.

Space Requirements:

• Maintain at least one meter of clearance at the front and rear of the switch cabinet for ventilation and maintenance.

• The equipment room should have a clear height of more than 3 meters.

Cabinet Requirements:

• The cabinet must be stable and strong enough to support the switch and its accessories.

• It should provide good ventilation, especially if it is a closed cabinet.

• The switch must fit the cabinet size, with clearance on the left and right sides for ventilation.

Follow this general flow for installing your 3COM 8807:

1. Start: Begin the installation process.

2. Confirm preparations: Ensure all necessary tools, components, and documentation are available.

3. Check installation site: Verify that the site meets all environmental, space, and power requirements.

4. Install cabinet: Securely install the 19-inch cabinet.

5. Install chassis and other components: Mount the 3COM 8807 chassis into the cabinet.

6. Connect PGND wire/power cord: Properly ground the chassis and connect the main power cords.

7. Power distribution box in cabinet: Set up the power distribution as needed.

8. Install cabling rack and fan tray: Mount the cabling rack and ensure the fan tray is correctly installed.

9. Insert I/O modules or Application modules: Install the necessary modules into their respective slots.

10. Connect cables to I/O modules or Application modules: Route and connect all network interface cables.

To install the 3COM 8807 in a 19-inch cabinet, follow these steps:

Step 1: Confirm before installation

• Ensure the cabinet is well-fixed and there are no obstructions inside or around it.

• Make sure the switch is ready for installation and has been moved to a convenient location near the cabinet.

Step 2: Mount a shelf

• Install a shelf inside the cabinet at the desired position to support the switch.

Step 3: Install cabling rack and mounting ears

• Install the cabling rack and attach the mounting ears (shipped with the switch) onto the switch chassis.

Step 4: Position the switch

• With another person, carry the switch by its side handles and slowly position it in front of the cabinet.

Step 5: Place the switch in the cabinet

• Lift the switch slightly higher than the shelf, place it on the shelf, and carefully push it into the cabinet.

Step 6: Secure the switch

• Align the mounting ears with the square holes in the cabinet posts and fasten the screws to fix the switch in place.

For the safety of operators and equipment, the 3COM 8807 must be well grounded with a resistance reading between the chassis and ground of less than 1 ohm.

Common Grounding Environment (with Ground Bar):

1. Remove the screw from the grounding hole on the switch chassis rear panel.

2. Place the connector of the PGND wire (provided with the switch) onto the grounding screw.

3. Insert the grounding screw back into the hole and tighten it.

4. Connect the other end of the ground wire to the ground bar in the equipment room.

Other Grounding Environments:

• If a ground bar is not available but earth is nearby: Hammer an angle iron or steel pipe (at least 0.5 m long) into the earth. Weld the yellow-green PGND wire to this grounding body and treat the joint to prevent corrosion.

• If no ground bar or earth burial is possible: An AC-powered switch can be grounded using the PE (Protective Earth) wire of the AC power supply, provided the PE wire is well-grounded at the power distribution room or transformer.

To connect the AC power cord to a PSU on the 3COM 8807, follow these steps:

1. Ensure the power switch on the PSU is in the OFF position.

2. Turn the plug-retention clamp at the left of the PSU front panel to the right.

3. Insert the plug at one end of the AC power cord into the socket on the PSU.

4. Turn the clamp to the left until it firmly grips the plug, securing it in place.

5. Insert the other end of the power cord into an external power socket.

The I/O modules for the 3COM 8807 are hot-swappable. To install one:

Step 1: Wear an ESD-preventive wrist strap and ensure it is well-grounded. Take the I/O module out of its packing bag.

Step 2: Unscrew the mounting screws holding the blank filler panel in the slot where you plan to install the I/O module, and remove the panel. Keep the panel for future use.

Step 3: Hold the ejector levers on the module with both hands and pull them outward. Align the I/O module with the guides in the chassis and slide it gently into the slot until its positioning pin touches the hole in the chassis.

Step 4: Pull the ejector levers inward to lock the positioning pin into the hole.

Step 5: Fix the I/O module by fastening its mounting screws with a screwdriver.

Application modules can be installed in an I/O module slot using the same procedure.

To connect the console cable for terminal-based configuration of your 3COM 8807:

Step 1: Plug the DB-9 or DB-25 female connector of the console cable into the serial port of the PC or terminal.

Step 2: Connect the RJ-45 connector of the console cable to the console port on the switch’s fabric module.

The PC serial port is not hot-swappable. Always connect the DB-9/DB-25 end first, then the RJ-45 end. To remove, reverse the order.

The console cable pinouts are as follows:

You must set the terminal parameters to communicate with the 3COM 8807 via the console port. The required settings are:

• Baud rate: 9600

• Data bits: 8

• Parity: none

• Stop bits: 1

• Flow control: none

• Terminal emulation: VT100

To set these parameters using Windows HyperTerminal:

1. Start HyperTerminal and create a new connection.

2. In the connection properties, select the correct COM port.

3. In the Port Settings, configure the bits per second to 9600, data bits to 8, parity to None, stop bits to 1, and flow control to None.

4. In the main window, go to File > Properties, click the Settings tab, and select VT100 for terminal emulation.

Before powering on your 3COM 8807, verify the following:

• The switch is stable and securely mounted.

• All boards (fabric, I/O modules) are correctly installed.

• All communication cables, fibers, power cords, and grounding wires are correctly and securely connected.

• The power source provides the proper voltage required by the switch.

• The Console cable is correctly connected, the PC or terminal is running, and the terminal parameters have been set correctly.

After powering on the 3COM 8807, it is recommended to check the following to ensure it is functioning correctly:

• The cooling system is working. You should be able to hear the fans and feel air being exhausted from the switch.

• All the system LEDs on the fabric modules function normally during the boot sequence and settle into their normal operating state.

• The console terminal displays the boot sequence information correctly.

If the console terminal is not behaving as expected with your 3COM 8807, follow these steps:

If the console displays nothing after power-on:

1. Check that the switch’s power system is working normally.

2. Verify that the fabric module is working normally.

3. Ensure the console cable is securely connected to the console port on the fabric.

If the issue persists, the problem is likely one of the following:

• The console cable is connected to the wrong serial port on the terminal.

• The console terminal parameters are set incorrectly. They should be: 9600 baud rate, 8 data bits, no parity, 1 stop bit, no flow control, and VT100 emulation.

• The console cable is faulty.

If the terminal displays illegible characters:

This is most likely due to incorrect terminal parameter settings. Verify that the settings match the required parameters listed above.

You can troubleshoot the PSU on your 3COM 8807 based on its LED behavior and command output.

If the `display power` command indicates the PSU is Not in Position, but LEDs are ON:

This suggests a poor connection between the PSU and the backplane. To correct this:

1. Switch off the power supply.

2. Loosen the screws on the PSU.

3. Push the PSU firmly into the chassis to ensure it is properly seated.

4. Tighten the screws.

5. Switch the power supply back on and check if the state is normal.

If the Input LED (green) and Output LED (green) are OFF:

• Check that the power cords are connected correctly.

• Ensure the power cords are in good condition.

• Verify that the power switch on the PSU has been turned to the ON position.

If the Fail LED (red) is ON:

• Check that the correct power voltage is being used (90 to 264VAC, 50-60 Hz for AC PSU).

• Ensure the air filter protecting the fan tray is clean. Excessive dust can block ventilation and cause a power supply failure.

If the problem persists, do not disassemble the PSU yourself; contact technical support.

The 3COM 8807 fan tray has two LEDs to indicate its status:

If the RUN LED is OFF, check that:

• The fan tray has been well seated in its slot.

• All cables connecting the fan tray to the backplane are secure and in good condition.

• The fans are working and their rotation is not blocked.

• All unused I/O module slots are covered with blank filler panels.

The AC PSU in the 3COM 8807 is hot-swappable.

Removing an AC PSU:

1. Change the power switch on the PSU from the ON position to the OFF position.

2. Pull the clamp holding the power cord connector and unplug the power cord.

3. Unscrew the screws on both sides of the PSU panel with a flathead screwdriver.

4. Hold the handle of the PSU and gently pull it out of the chassis along the guides.

Installing an AC PSU:

1. Hold the handle of the new PSU with one hand and support the bottom with the other. Gently slide the PSU into the chassis along the guides until it is secure in the backplane.

2. Fasten the screws on both sides of the PSU panel with a flathead screwdriver.

3. Check that the power switch on the panel is in the “OFF” position.

4. Insert the AC power cord into the socket on the PSU.

5. Push the clamp down to hold the power cord securely.

It is recommended to clean the air filters semimonthly to ensure adequate ventilation.

Cleaning the PSU Air Filter:

1. Hold the air filter by its upper and lower edges and gently pull it out of the PSU.

2. Take the black air filter mesh out of the cover.

3. Clean the mesh with water and allow it to air dry completely. Do not rub the mesh.

4. Place the dry mesh back into the air filter cover and push the filter back into the PSU.

Cleaning the Chassis’s Air Filter:

1. Unscrew the screws at the top and bottom of the air filter with a flathead screwdriver.

2. Hold the air filter at the left-rear, pull part of it out, and then support its weight from underneath as you slide it out completely along the guides.

3. Directly wash the entire air filter assembly, allow it to air dry, and then slide it back into the chassis.

4. Fasten the screws to secure it.

To replace the fan tray in an operating 3COM 8807:

1. Wear an ESD-preventive wrist strap.

2. Remove the screws from both sides of the fan tray.

3. CAUTION: When replacing the fan tray on an operating switch, pull it out only after the fans have stopped rotating. Be aware that fans may still be spinning, so do not put your hand into the fan tray to avoid injury.

4. Pull the fan tray out by its handle to separate it from the backplane.

5. Gently pull the fan tray completely out of the slot along the guides and place it in an anti-static packing bag.

6. On the new fan tray, hold its handle and bottom, and pull the ejector levers outward.

7. Align the new fan tray with the guides in the chassis and slide it gently into the slot until its positioning pin touches the positioning hole in the chassis.

8. Insert and tighten the screws on both sides of the fan tray.

CAUTION: Install a new fan tray soon after removing the old one to ensure the switch operates with proper cooling.

To upgrade the software on your 3COM 8807, follow these general steps:

1. Confirm that a host program is already loaded before starting the upgrade.

2. Check the current version of the host and Boot ROM programs.

3. Back up the current host program, Boot ROM program, and configuration file to your PC.

4. Load the new host and Boot ROM program files to the switch (e.g., via FTP or TFTP). If the switch has two fabrics, you can copy the files to the standby fabric.

5. Upgrade the Boot ROM program on the fabric and I/O modules if necessary.

6. If the switch has two fabrics, specify the new load programs for both the active and standby fabrics.

7. Reboot the switch.

8. After reboot, check that the board version is correct.

9. The software can be loaded through the command line interface (CLI) using FTP or TFTP, or locally from the Boot menu using XModem, TFTP, or FTP.

If you encounter problems during a software upgrade on your 3COM 8807, consider the following:

No response from the fabric serial interface:

• Make sure the serial interface cable is in good condition and that its terminal attributes (baud rate, etc.) are set correctly.

Uploading the configuration file or host program using FTP fails:

• Check that the IP configuration is correct and that the FTP server is started.

• Ensure the switch’s Flash memory has enough space for the new files.

• If you are using the Boot Menu, ensure the TFTP flag is not selected, as TFTP is not supported for this specific function.

The configuration did not save during the I/O module reboot:

• Before saving the configuration, check the operating status of the I/O modules. Do not save the configuration while an I/O module is rebooting, as the configuration may be lost.

I/O module program loading fails or registration takes too long:

• Check that the I/O module type is supported by the current host program.

• Check that the I/O module’s Boot ROM program matches the host program.

• Ensure the I/O modules are well seated in their slots.

• Try inserting the I/O module into other slots to check if the module itself is defective.

Insufficient Flash memory:

• Empty the recycle bin when the I/O module starts.

• Delete any unused or old files in the Flash memory.

If you lose the switch’s Super password or Boot ROM password, you will need to contact your local support representative for assistance with password recovery.

A lightning arrester is not shipped with the 3COM 8807 and must be purchased separately if needed, especially when connecting an outdoor AC power cord.

Installation and Use:

1. Install your lightning arrester (typically a socket strip with protection) according to its manufacturer’s instructions.

2. CAUTION: Ensure the arrester is well-grounded before using it for power.

3. Plug the 3COM 8807’s AC power cord into the lightning arrester’s socket.

4. Check the arrester’s indicators. Typically, a green LED indicates that the power is on and the protection function is active. A red LED may indicate a grounding or polarity problem.

5. If there is an issue indicated by the red LED, verify that the arrester’s ground wire is well-grounded and that the live and zero wires are connected correctly.

To protect a network port that uses an outdoor cable, you should install a network port lightning arrester.

Required tools:

• Phillips or flat-module screwdriver

• Multimeter

• Tilted wire cutter

Installation Procedure:

1. Use the double-faced adhesive tape provided with the arrester to stick it onto the switch’s chassis, as close as possible to the grounding screw.

2. Cut the arrester’s ground wire to the required length and securely tighten it to the switch’s grounding screw.

3. Use a multimeter to confirm that the arrester’s ground wire has a proper connection to the chassis’s grounding screw.

4. Connect the cables according to the arrester’s instructions: the outdoor network cable goes into the arrester’s “IN” port, and a separate cable connects from the arrester’s “OUT” port to the switch’s network port.

5. Use nylon ties to bundle the cables neatly.

Installation Precautions:

• The ground wire for the arrester should be as short as possible.

• If the switch has more than one network port connected to outdoor cables, you should install lightning arresters for all such ports.