Zultys ZIP4x4, User Manual

Page: 50 / 194

40
ZIP4x4 User’s Manual
If the common configuration file indicates a different version of the software than the specific
configuration file, the phone retrieves the software version specified by the specific configuration
file.
The phone programs itself with the new software and restarts.
5.3.3 Binary File
The binary file for the software contains the software version. When the ZIP4x4 reads the file, it
verifies the version that is contained in the file with the file name and will not load it if the
versions do not match.
The first characters in the binary file are encoded as a null terminated ASCII string. The end of the
file contains a 16 bit CRC sum check.
The size of the binary file is between 2 MB and 4 MB.
5.3.4 Ladder Diagram
Figure 5-2 shows the messages used in this process. The following sections describe the process.
5.3.4.1 Step 1
Action. ZIP4x4 sends DHCP DISCOVER (broadcast)
Description. The ZIP4x4 boots (after power is initially applied or after receiving a SIP NOTIFY
message) and sends out a DHCP DISCOVER message requesting an IP Address and other options
(same as those provided in DHCP ACK).
5.3.4.2 Step 2
Action. DHCP Server responds with a DHCP OFFER
Description. The DHCP Server indicates an available IP Address to the ZIP4x4.
5.3.4.3 Step 3
Action. ZIP4x4 sends DHCP REQUEST (broadcast)
Description. The ZIP4x4 accepts the DHCP server’s offer and asks the server to provide its
configuration.
5.3.4.4 Step 4
Action. DHCP Server sends DHCP ACK
Description. DHCP Server responds with committed IP Address and other configuration options.
The specific options needed by the ZIP4x4 are described in section 5.1.1.1.