Gigabit QAM Modulator Model D9479 Hardware Installation and ...

Chapter 4 Operating the ModulatorUnderstand the Boot ProcessThis section describes the boot process and lists examples of the screens that appearduring a normal boot process. The Bootstrap (BOOTP) protocol is used to initializeand 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 serverNote: The GQAM downloads software using Trivial File Transfer Protocol (TFTP),which is a simplified version of FTP.See Change the Boot Mode (on page 65) for a description of the boot modes availableand instructions for changing the boot mode.See Troubleshooting Boot Screen Error Messages (on page 104) for troubleshootingbooting conditions.Boot Process1 The GQAM sends a BOOTP request to the DNCS.2 The DNCS responds to the BOOTP request, sending the IP address for theGQAM.3 The GQAM sends a TFTP request for the configuration file.Note: The configuration file (gqam.config) contains environment variables,download files, and server addresses.4 The DNCS sends the TFTP gqam.config file.5 If the files in the gqam.config file are different from those stored in the GQAM,then the GQAM requests the download files, which consist of the following:• Boot code for Host, NP1, NP2, and NP3• Application code for Host, NP1, NP2, and NP3• RF module code for RF Modules 1, 2, 3, and 4Initial Boot ScreensNote: The messages that appear on the front panel of the GQAM during the bootprocess are described in Initial Boot Screens (on page 62) and Code DownloadScreens (on page 63).The following illustrations show examples of the initial boot screens.62 78-745431-01 Rev E