3Com 3C780 User Guide - Page 84

3-16 Configuring the Hub All three types of port modules can be installed in slot 1. The type of module you install depends on the medium you are using to connect the hub to the next node. Table 3-5 shows how to configure each module for the type of attachment desired and what additional equipment or action is necessary to complete the connection. (Refer to the section "Setting Attachment Port Configurations" in Chapter 4 for information about configuring the attachment ports.) For example, if you want to establish either a dual attachment or a dual homed connection, configure the module's attachment ports as B/A. For a single attachment connection, configure the module's attachment ports as S/M. For a null attachment, set the attachment ports as M/M. To discover the configuration of the attachment ports on the module in slot 1, check the ATTACH LED display on the management module or enter the show attach command. The ATTACH LED is lit whenever there is a module installed in slot 1. Table 3-5. Configuring Modules Module Attachment Type Attachment Additional Port Equipment Configuration Required Fiber Dual B/A None Dual homing B/A Single S/M None None Null M/M None STP Dual B/A Dual homing B/A 2 Cascade connectors 2 Cascade connectors Single S/M 1 Cascade connector Null M/M None (continued)