3Com 09-0487-002 User Manual

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3Com 09-0487-002 User Manual

LinkBuilder FDDI Workgroup Hub User Guide Release Note 1

LinkBuilder® FDDI Workgroup Hub

User Guide Release Note

Part No. 09-0487-002/October 1993

This release note to the 3Com® LinkBuilder® FDDI Workgroup Hub User Guide discusses the following topics:

Change in FCC compliance Contents of the LinkBuilder diskette Corrections in the User Guide

Software-related

Hardware-related Replacing the fuse

Change in FCC Compliance

This notification of FCC compliance replaces the FCC compliance and verification statements on page v of the LinkBuilder FDDI Workgroup Hub User Guide. This notification acknowledges compliance with the limits for a Class A digital device instead of a Class B digital device.

WARNING: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a commercial installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case, the user will be required to correct the interference at the user’s own expense.

Changes or modifications not expressly approved by 3Com could void the user’s authority to operate this equipment.

Contents of the LinkBuilder Diskette

The diskette shipped with the LinkBuilder FDDI Workgroup Hub contains the following:

Backup copy of LinkBuilder FDDI system software image, version 1.0

Readme file

2 LinkBuilder FDDI Workgroup Hub User Guide Release Note

The system software has been preloaded into the hub management module flash memory. Downloading the image to the FDDI Workgroup Hub disrupts the ring. The download sequence isolates the hub from the ring during the poweron self-test (POST) and may cause the ring to wrap or to isolate attached stations. Downloads impact the ring the least when the hub is attached to the ring in a ring of trees configuration as a single attachment hub.

Corrections in the User Guide

The information provided in this section corrects softwareand hardware-related errors and omissions.

Software-Related Corrections

The corrections below are software corrections:

Page 2-14: Check the Baud Rate Setting After Post

When the power-on self-test (POST) is run, the hub’s serial port output defaults to 9600 baud regardless of the baud rate setting in nonvolatile RAM. If you have set the console baud rate to other than 9600, you may need to adjust the attached terminal baud rate after POST has finished. The default baud rate setting is 9600.

Page 2-14: Removing Modules

The first two steps for removing modules as given in the User Guide should be reversed. They should read:

1.Enter the disconnect command.

This disables all ports and isolates the hub from the ring.

2.Disconnect all cables connected to the module that you want to remove.

If possible, you should always turn off the power before attempting to remove or insert hardware.

LinkBuilder FDDI Workgroup Hub User Guide Release Note 3

Removing modules from the hub with the power on will not damage the hardware. However, the software may not be able to distinguish between intentional removal and catastrophic failure of a media module. As a result, some errors will be entered in the fault log and in some cases may fill the fault log entirely. The most common error resulting from the removal of a media module is 05000002 (bus error). Other errors may also occur. Check the fault log for valid errors before you remove any module. Also, clear the fault log (using the clear log command) after all changes are complete and the system has been reinitialized.

Pages 3-9, 3-10, and 3-11: Accessing the Primitive Console Command Mode

The procedure for accessing the primitive console command mode has been modified. To access the primitive console command mode:

1.Press the RESET button once, or enter the reset command.

During the subsequent power-on self-test (POST), the status LED flashes amber/green for 10 seconds, indicating that the primitive console command mode is being accessed.

2.Press the RESET button again.

POST is reinitialized. When POST is completed, this prompt appears for 10 seconds:

Press Ctrl-P to enter Primitive console

All other keys except [Ctrl] and [P] are ignored during this 10-second interval.

3.Press [Ctrl] + [P].

The hub is now in the primitive console command mode.

If you do not access the primitive console command mode, POST executes the system software resident in flash memory. Prior to execution of the system software, POST verifies that flash memory is not corrupted. This process takes about 20–30 seconds. During this time the status LED is off.

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