Appendix A Using the ROM Monitor

Recovering Boot and System Images

Table A-1 Commonly Used ROM Monitor Commands (continued)

Command

Description

 

 

-?

Displays information about command syntax; for example:

 

rommon 16 > dis -?

 

usage : dis [addr] [length]

 

The output for this command is slightly different for the xmodem download

 

command:

 

rommon 11 > xmodem -?

 

xmodem: illegal option -- ?

 

usage: xmodem [-cyrxu] <destination filename>

 

-c CRC-16

 

-y ymodem-batch protocol

 

 

reset or i

Resets and initializes the voice gateway, similar to a power up.

 

 

dir device:

Lists the files on the named device; for example:

 

rommon 5 > dir flash:

 

Directory of flash:

 

2 1343152 -rw- cVG204-advipservices-k9.mz

 

rommon 6 >

 

 

meminfo

Lists the main memory information; for example:

 

rommon 6 > meminfo:

 

Main memory size: 128 MB.

 

Available main memory starts at 0x80018000

 

IO (packet) memory size: 5 percent of main memory

 

NVRAM size: 128 KB

 

 

boot commands

For more information about the ROM monitor boot commands, see the Cisco IOS

 

Configuration Fundamentals and Network Management Guide.

 

 

b

Boots the first image in flash memory.

 

 

b flash: [filename]

Attempts to boot the image directly from the first partition of flash memory. If you

 

do not enter a filename, this command will boot this first image in flash memory.

 

 

Recovering Boot and System Images

If your voice gateway experiences difficulties and no longer contains a valid Cisco IOS software image in flash memory, you can recover the Cisco IOS image by using the xmodem ROM monitor command. Use this command if the computer attached to your console has a terminal emulator that has xmodem capability. The xmodem command establishes a connection between a console and the voice gateway console port for disaster recovery if both the boot and system images are erased from flash memory.

The syntax for the command is xmodem [filename]. The optional parameter argument filename specifies the source file containing the Cisco IOS image. Other options include the following:

-c—Use cyclic redundancy check (CRC-16).

-y—Use Ymodem transfer protocol.

Note The Cisco VG202, Cisco VG202XM, Cisco VG204, and Cisco VG204XM voice gateways only support the -cand -yoptions.

Cisco VG202, Cisco VG202XM, Cisco VG204, and Cisco VG204XM Voice Gateways Software Configuration Guide

 

A-4

OL-16191-01

 

 

 

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Cisco Systems VG202XM, VG204 Recovering Boot and System Images, Command Description, Reset or, Meminfo, Flash filename

VG202, VG204XM, VG204, VG202XM specifications

Cisco Systems has long been a leader in the realm of networking technology, providing innovative solutions for businesses of all sizes. Among its products, the Cisco VG202XM, VG204, VG204XM, and VG202 series stand out as vital components in voice gateway solutions for IP telephony applications.

The Cisco VG202XM and VG204 series are designed to facilitate the convergence of voice and data as businesses transition to VoIP (Voice over Internet Protocol). These voice gateways offer seamless integration with legacy telephony systems while enabling the deployment of advanced IP-based telephony features. They are particularly useful for organizations looking to preserve their existing investments in traditional telephony infrastructure while embracing modern communication technologies.

One of the main features of the VG202XM and VG204 series is their support for two-line interfaces, catering to varying deployment needs. The VG202 provides two FXS (Foreign Exchange Station) ports, which allow businesses to connect analog phones and fax machines directly. The VG204 enhances this capability by offering four FXS ports, accommodating larger user bases and providing more connections for local telephony equipment.

These gateways support an array of voice codecs and can handle up to 16 concurrent calls, ensuring high-quality voice communication in busy environments. Their integration with Cisco's Unified Communications Manager allows users to access a host of advanced telephony features such as call forwarding, voicemail, and conferencing.

On the technology front, the VG202XM and VG204 series support both SIP (Session Initiation Protocol) and H.323 protocols, making them versatile for varied network environments. They also offer advanced QoS (Quality of Service) capabilities, ensuring that voice traffic is prioritized over other types of data, which is essential in maintaining call clarity and reliability.

Additionally, the VG204XM variant adds built-in safety features, such as power over Ethernet (PoE), which eliminates the need for separate power supplies for connected devices. This not only streamlines deployment but also enhances the reliability of the voice system.

In terms of management, these devices are equipped with Cisco's user-friendly interface, which simplifies configuration and monitoring. They can be managed through various tools offered by Cisco, making it easier for IT departments to maintain and optimize their voice services.

Overall, the Cisco VG202XM, VG204, VG204XM, and VG202 series deliver robust, scalable, and reliable solutions for businesses aiming to leverage the benefits of voice gateways in their enterprise networks. These devices not only provide essential voice capabilities but also pave the way for future growth and integration in an increasingly digital world.