BUTFTPD is used instead of TFTPD for loading of the CP dump, in order to keep the same functionality in CPS, regardless of which IO-system that is used. BUTFTPD will have its own port number. When BUTFTPD receives an order for the CP dump from TFTPP, the request will be forwarded to BUAP. BUAP performs the actual reading of data and answers the request from BUTFTPD. BUTFPTD forwards the answers to TFTPP.

Command ordered initial load into the separated CP Stand by (CP-SB/SE), can be performed either with the CPT command PTCPL or with the CP-command FCCPL. Then a STOC device must be separated, which is performed by entering the command FCRWS or making a hardware reset. A command ordered system reload is performed by entering the CPT command PTSRI or the CP-command SYREI. In these cases only one loading attempt is performed. If it fails a fault code is received. For automatically system reload and Forced Executive (FEX) load new attempts are performed until success. An exception is for automatically system reload that is not a FEX load and when the CP memory is unchanged. If the system reload fails it follows by a large restart.

At hardware reset of a STOC device, the STOC device remains separated if the CP Executive (CP-EX) is not working. If working, the CP-EX will deblock the STOC device. The CP-EX shall therefore be stopped by closing the PHC with the button in both CP-sides and then entering the CPT command PTSES, at exchange stoppage before a STOC device is separated by a hardware reset. When the CP-EX is working, the command FCRWS shall be entered instead of performing a hardware reset for separating a STOC device. When the STOC device is permanently separated, it is possible to perform an initial load into the separated CP-SB/SE either by entering the CPT command PTCPL or by entering the CP-command FCCPL. 3.1.12.2 Initial Load or Reload of a CP Dump via IPN

Figure 1   Software blocks involved, and protocols present

The path to the left in the picture shows main path of data flow during loading.

The path in the middle shows the path which is used to fetch IPNA regional SW and configuration data files from APG40.

The path to the right is used to get configuration data (IP addresses and configuration data file names) from APG40. This at the reboot of the IPNA.

Table 1    Summary of software shown in Figure 1

LOCATION NAME DESCRIPTION

CP LAB Loading administration and CP bootstrap.

IPNA LACPIPN Interface between LAB and TFTP client.

IPNA FTPC FTP client. Retrieves requested files from a FTP server.

AP BUFTPD FTP server, providing access to CP dump.

IPNA TFTP TFTP client. Retrieves requested files from a TFTP server.

AP TFTPD TFTP server, provides boot code

IPNA DHCP DHCP client, used to configure IPNA

AP BOOTPD BOOTP/DHCP server, provides configuration information to IPN hosts(e.g. STOC,IPNA).

At a command ordered initial load (PTCPL) or restart with reload (PTSRI), it is possible, for the operator, to specify IP address and port of loading application of the AP to be loaded from.