Keep in mind that the DEFINITY LAN Gateway system is data terminal equipment (DTE), and the switch is data communications equipment (DCE). Therefore, you may need to install a null modem to complete the DTE/DCE pair when connecting the PC.

MFB Port Usage

The MFB Y-cable has two RS-232C connectors labeled Main/Port A and Admin/Port B.

The administration and maintenance terminal should be connected to Admin/Port

B.Some system diagnostic messages, created only when the system is initializing, are sent to Main/Port A. These additional messages are not useful during normal operation of the system.

Perform one of the four Subtasks (7A, 7B, 7C, or 7D, depending on the connection type) to connect a system-access terminal to Admin/Port B. Use Worksheet B-1, Terminals/Modems, to determine which tasks to complete.

The descriptions of Tasks 7B, 7C, and 7D assume that you are connecting a remote terminal to Admin/Port B. You can also use these tasks for a remote connection to Main/Port A by substituting A for B in the descriptions.

Task 7A: Install a Terminal via a Direct

Connection

Refer to Figures 2-8, Installing a Terminal via Direct Connection, and 2-9, Installing a Terminal via Direct Connection (DC Switch Only), while performing this task.

2-18Issue 1 January 1996

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AT&T 555-230-223 manual MFB Port Usage, Task 7A Install a Terminal via a Direct Connection