Appendix C Using the ROM Monitor

Entering the ROM Monitor Mode

To change the virtual configuration register from the ROM monitor, enter confreg by itself for menu mode, or enter the new value of the register in hexadecimal.

confreg [hexnum]—Change the virtual configuration register to the value specified. The value is always interpreted as hexadecimal.

Note Entering confreg without an argument displays the contents of the virtual configuration register and prompts you to alter the contents by describing the meaning of each bit. In either case, the new virtual configuration register value is written into NVRAM, but is not effective until you reset or power-cycle the router.

The following display shows an example of the confreg command:

rommon

7 > confreg

 

 

 

Configuration Summary

 

 

 

enabled

 

are:

 

 

 

break/abort has effect

 

 

 

console

 

baud: 9600

 

 

 

boot: the ROM Monitor

 

 

 

do you

wish to change the configuration? y/n

[n]: y

enable

 

“diagnostic mode”? y/n

[n]:

y

 

enable

 

“use net in IP bcast address”? y/n

[n]:

enable

 

“load rom after netboot fails”? y/n

[n]:

enable

 

“use all zero broadcast”? y/n

[n]:

 

disable

 

“break/abort has effect”? y/n

[n]:

 

enable

 

“ignore system config info”?

y/n [n]:

change

console baud rate? y/n

[n]:

y

 

enter rate: 0 = 9600, 1 = 4800, 2 = 1200,

3 = 2400

 

 

4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200 [0]: 0

change

the boot characteristics? y/n

[n]:

y

enter to boot:

 

 

 

0 = ROM Monitor

 

 

 

1 = the boot helper image

 

 

 

2-15 =

 

boot system

 

 

 

[0]:

0

 

 

 

Configuration Summary enabled are: diagnostic mode break/abort has effect console baud: 9600 boot: the ROM Monitor

do you wish to change the configuration? y/n [n]:

You must reset or power cycle for new config to take effect

Using the show rom-monitor command

The show rom-monitorcommand displays the current version of the read-only ROM monitor and, if present displays the upgrade version of the ROM monitor. The upgrade version is selected when the system is rebooted. This command runs in the Cisco IOS EXEC mode.

You get the following output when the read only ROM monitor is present:

Cisco VG224 Voice Gateway Software Configuration Guide

 

C-6

OL-5005-01

 

 

 

Page 60
Image 60
Cisco Systems VG224 manual Using the show rom-monitor command, Confreg

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.