Cisco Systems OL-11497-03 Bit Address net host, Data Transmission Rate bps, 9600 4800 1200 2400

Chapter 4 Troubleshooting the Installation

Performing Other Configuration Tasks

Bit 8—Bit 8 of the software configuration register controls the console Break key. Setting bit 8 causes the system to ignore the console Break key. This is the factory default. Conversely, clearing bit 8 causes the system to interpret a Break keystroke as a command to halt normal system operation and force the system into ROM monitor mode. Regardless of the setting of the Break enable bit in the software configuration register, pressing the Break key during approximately the first 5 seconds of booting causes a return to the ROM monitor.

Bit 9—Bit 9 is not used.

Bits 10 and 14—Bit 10 of the software configuration register controls the host portion of the IP broadcast address. Setting bit 10 causes the processor to use all zeros in the host portion of the IP broadcast address; clearing bit 10 (the factory default) causes the processor to use all ones. Bit 10 interacts with bit 14, which controls the network and subnet portions of the IP broadcast address. Table 4-4shows the combined effect of bits 10 and 14.

Table 4-4		Configuration Register Settings for Broadcast Address
		Destination
Bit 10	Bit 14		Address (<net> <host>)
Off	Off		<ones> <ones>
On	Off		<zeros> <zeros>
On	On		<net> <zeros>
Off	On		<net> <ones>

Bits 11 and 12—Bits 11 and 12 of the software configuration register determine the data transmission rate of the console terminal. Table 4-5shows the bit settings for the four available data transmission rates. The factory-set default data transmission rate is 9600 bps.

		Table 4-5		System Console Terminal Data Transmission Rate Settings
		Bit 12	Bit 11		Data Transmission Rate (bps)
0			0		9600
0			1		4800
1			0		1200
1			1		2400
	Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
4-10					OL-11497-03