Cisco Systems 2020 manual Attaching a Terminal to a Console Port, Background Information, Guide

Basic LS2020 Configuration Tasks

For more information about trunk port configuration, refer to the LightStream 2020 Configuration

Guide.

Attaching a Terminal to a Console Port

This section explains how to attach a VT100 terminal (or equivalent) to the console port of a

Release 2 switch card and how to match the baud rate between them.

Background Information

Prior to Release 2.1 of the LS2020 platform software, the TCS hub code for a Release 2 switch card (SC2) supported baud rate selection for both the console and modem ports through what was called the “BREAK” detection mechanism (also referred to as the “auto-baud” or “pseudo-auto-baud” mechanism). Use of this mechanism, which involved multiple activations of the Break key for baud rate selection, is no longer supported. Under this previous scheme, the midplane EEPROM locations used to maintain the console and modem port baud rates were “reserved” and, hence, not initialized with appropriate default values.

Now, when new TCS hub code is installed in a Release 2 switch card that has not had these “reserved” locations initialized, the new code evaluates the contents of these EEPROM locations and initializes them, if required, with appropriate default values. See the section below entitled “Setting Console/Modem Baud Rates through TCS Hub Commands” for these default values and the order of precedence for other possible baud rates for the console and modem ports.

Setting Console/Modem Baud Rates through TCS Hub Commands

To detect and set baud rates for the console and modem ports for Release 2 switch cards, you use the TCS hub show and set commands, respectively. These commands interpret and manipulate the contents of specific fields in the midplane EEPROM used for storing initialized baud rates for the console and modem ports.

Note Baud rate detection and selection for the console and modem ports apply only to Release 2 switch cards.

The general form of the TCS hub show command for baud rate detection is outlined below:

TCS hub<<A or B>> show <sa sb> <console modem> baudrate

where:
TCS hub<<A or B>>	Is the TCS hub prompt for the switch card (either switch card A or B, as
	appropriate)
show	Is the command that operates in conjunction with command arguments to
	display the baud rate for the specified switch and the specified port
<sa sb>	Denotes that the show command is to apply to switch card A or B,
	whichever is specified
<console modem>	Denotes that the show command is to apply to the console port or the
	modem port, whichever is specified
baudrate	Displays the baud rate for the specified port

The general form of the TCS hub set command for baud rate selection is outlined below:

Hardware Installation 2-17