3Com 5104M-FB1, 5102M-FBP, 510M-FBP Enabling Low Light Warning, Enabling Optical Power

When you set redundancy between two ports on the same 10BASE-FB Module and the primary port and the redundant port experience a link failure simultaneously, and you disable redundancy:

❑The primary port is disabled

❑The redundant port is enabled

Enabling Low Light Warning

You can enable or disable low light warning for all ports on the module. When you enable low light warning, the Status LED of the port which detects the low light condition blinks 6 times. (A low light condition is defined as power received between -26.0 dBm and -30.0 dBm peak power.)

You may have a legal configuration in which low light is acceptable to span a long distance. In this case, you may want to disable the low light warning so the Status LED does not blink for this connection.

To enable or disable low light warning for a port, use the following management command:

SET PORT {slot.port} LOW_LIGHT_WARNING {enable}

{slot.all}{disable}

Enabling Optical Power

High-power optics are standard in all 3Com ONline fiber optic products. The higher power allows you to directly connect buildings as far as 4.0 kilometers apart without the additional expense of signal-boosting equipment. However, it is necessary to set a port to the normal power setting when it is connected to a 3Com 10BASE-FB fiber optic product.

Each port on the Port-Switching 10BASE-FB module can be set to high or normal power through the dip switches or through management commands. To set a port to high or normal power, use the following management command:

SET PORT {slot.port} HIGH_POWER {enable}

{slot.all}{disable}

Installing and Operating the Module 3 - 17