Appendix C Using the ROM Monitor

Entering the ROM Monitor Mode

System Bootstrap, Version 12.3(4)T, RELEASE SOFTWARE (fc1) TAC Support: http:_//www.cisco.com/tac

Copyright (c) 2002 by cisco Systems, Inc.

cvg224 processor with 196608 Kbytes of main memory

Main memory is configured to 64 bit mode with parity disabled

Upgrade ROMMON initialized rommon 1 >

Following output example a configuration that has been saved:

Router# upgrade rom-monitor file tftp://223.225.254.254/ajayhn/cvg224_BM2.SREC

Loading ajayhn/Cvg224_RM2.srec from 223.255.254.254 (via FastEthernet0/0):

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[OK - 641719/1283072 bytes]

This command will reload the router. Continue? [yes/no]: y Erasing boot flash eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee Programming boot flash pppp

Now Reloading

System Bootstrap, Version 12.3(4)T, RELEASE SOFTWARE (fc1) TAC Support: http://www.cisco.com/tac

Copyright (c) 2001 by cisco Systems, Inc. Running new upgrade for first time

System Bootstrap, Version 12.3(4)T, RELEASE SOFTWARE (fc1) TAC Support: http://www.cisco.com/tac

Copyright (c) 2002 by cisco Systems, Inc.

cvg224 processor with 196608 Kbytes of main memory

Main memory is configured to 64 bit mode with parity disabled

Upgrade ROMMON initialized rommon 1 >

Note The rommon-prefin ROMMON mode provides the same information as upgrade rom-monitor preference command in the Cisco IOS EXEC mode.

Recovering Boot and System Images

If your router experiences difficulties and no longer contains a valid Cisco IOS software image in flash memory, you can recover the Cisco IOS image using one of the following ROM monitor commands:

xmodem—Use this command if the computer attached to your console has a terminal emulator that has xmodem capability.

tftpdnld—Use this command if you have a TFTP server directly connected to a Fast Ethernet port.

Using the xmodem Command

The xmodem command establishes a connection between a console and the router console port for disaster recovery, if both the boot and system images are erased from flash memory.

xmodem [filename]—Establishes an xmodem connection between the console and the router. The optional parameter filename specifies the source file containing the Cisco IOS image.

Other options include the following:

-c—Uses cyclic redundancy check (CRC-16)

-y—Uses Ymodem transfer protocol

Cisco VG224 Voice Gateway Software Configuration Guide

 

C-8

OL-5005-01

 

 

 

Page 62
Image 62
Cisco Systems VG224 manual Recovering Boot and System Images, Using the xmodem Command

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.