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Chapter 4 Operating the Modulator
Understand the Boot Process
This section describes the boot process and lists examples of the screens that appear
during a normal boot process. The Bootstrap (BOOTP) protocol is used to initialize
and to acquire the following configuration information:
IP address
Address mask
Location of default gateway
Addresses of important servers
Name and location of software download file(s) from the network BOOTP server
Note: The MQAM downloads software using Trivial File Transfer Protocol (TFTP),
which is a simplified version of FTP.
See Change the Boot Mode (on page 45) for a description of the boot modes available
and instructions for changing the boot mode.
See Troubleshooting Boot Screen Error Messages (on page 79) for troubleshooting
booting conditions.
1
The MQAM sends a BOOTP request to the DNCS.
2
The DNCS responds to the BOOTP request, sending the IP address for the
MQAM.
3
The MQAM sends a TFTP request for the configuration file.
Note: The configuration file (mqam.config) contains environment variables,
download files, and server addresses.
The DNCS sends the TFTP mqam.config file.
4
5
If the files in the mqam.config file are different from those stored in the MQAM,
then the MQAM requests the download files, which consist of the following:
Boot code
Application code
RF module code
Note: The messages that appear on the front panel of the MQAM during the boot
process are described in Initial Boot Screens (on page 43) and Code Download
Messages (on page 44).
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Table of Contents
Troubleshooting
