Appendix C Using the ROM Monitor

Entering the ROM Monitor Mode

To enter the ROM monitor mode, do the following:

Configuring

 

Command or Action

Purpose

Step 1

 

 

Router> reload

Restarts the Cisco VG224.

Step 2

 

 

Press the Break key during the first 60 seconds while

Forces the router to stop booting

 

the system is starting up.

and enter the ROM monitor mode.

 

 

 

Verifying

To verify that you are in ROM monitor mode, check that the prompt displayed on your screen is the ROM monitor mode prompt:

rommon # >

The # is the line number and increases incrementally at each prompt.

Tip From the Cisco IOS software, you can configure the router to automatically enter the ROM monitor mode the next time the router boots by setting virtual configuration register bits 3, 2, 1, and 0 to zero. From the console, enter the following configuration command:

configuration-register 0x0

The new configuration register value, 0x0, is effective after the router is rebooted with the reload command. The router remains in ROM monitor and does not boot the operating system.

As long as the configuration register value remains 0x0, you must manually boot the operating system from the console. Refer to the boot command in the section “Command Descriptions” later in this appendix.

ROM Monitor Commands

Enter ? or help at the ROM monitor mode prompt to display a list of available commands. For example:

 

 

 

rommon 1 >

?

 

 

 

 

 

alias

set and

display aliases command

 

 

 

boot

boot up

an external process

 

 

 

break

set/show/clear the breakpoint

 

 

 

confreg

configuration register utility

 

 

 

cont

continue executing a downloaded image

 

 

 

context

display

the context of a loaded image

 

 

 

cookie

display

contents of cookie PROM in hex

 

 

 

dev

list the device table

 

 

 

dir

list files in the file system

 

 

 

dis

display

instruction stream

 

 

 

dnld

serial download a program module

 

 

 

frame

print out a selected stack frame

 

 

 

fpga-pref

select an FPGA

 

 

 

help

monitor

builtin command help

 

 

 

history

monitor

command history

 

 

 

meminfo

main memory information

 

 

 

repeat

repeat a monitor command

 

 

 

Cisco VG224 Voice Gateway Software Configuration Guide

 

 

 

 

 

 

 

 

 

 

 

C-2

 

 

 

OL-5005-01

 

 

 

 

 

 

Page 56
Image 56
Cisco Systems VG224 manual ROM Monitor Commands, Configuring, Verifying, Command or Action Purpose

VG224 specifications

The Cisco Systems VG224 is a versatile VoIP (Voice over Internet Protocol) gateway designed to facilitate the integration of traditional phone systems with modern IP-based communications. This device plays a crucial role in providing connectivity between analog phones and digital networks, allowing organizations to transition smoothly from legacy telephony systems to IP telephony.

One of the standout features of the VG224 is its ability to support up to 24 analog phone lines. This scalability makes it an ideal choice for small to medium-sized businesses that require a dependable solution to handle their telephony needs without overspending on infrastructure. The VG224 acts as a bridge, converting analog voice signals into digital IP packets, thus enabling seamless communication over the Internet or intranets.

The VG224 is equipped with a range of technologies that enhance its functionality and reliability. Voice activity detection (VAD), comfort noise generation (CNG), and echo cancellation are just some examples of the advanced audio processing techniques integrated into the VG224. These technologies improve call quality by ensuring clear and uninterrupted conversations, even under varying network conditions.

In terms of characteristics, the VG224 features a user-friendly interface with a web-based management console, making it easy for network administrators to configure and manage the device remotely. This streamlined approach to management is crucial for businesses that require quick adjustments to their communication infrastructure without the need for extensive technical knowledge.

The VG224 supports multiple signaling protocols, including H.323, MGCP (Media Gateway Control Protocol), and SIP (Session Initiation Protocol). This flexibility allows it to integrate seamlessly with various IP telephony systems and offers businesses the option to utilize their preferred communication standards. Additionally, the device supports power over Ethernet (PoE), providing the convenience of powering devices through the same cable used for data connectivity, thus reducing the need for additional power sources.

In conclusion, the Cisco Systems VG224 is a robust VoIP gateway that combines advanced technology with user-friendly features. Its capacity to support up to 24 analog lines, along with its compatibility with various signaling protocols, makes it an excellent choice for businesses looking to modernize their telecommunication systems while maintaining the reliability of traditional analog connections. With its ease of management and high-quality voice processing capabilities, the VG224 stands out as a key asset for any organization aiming to optimize its communication infrastructure.