Specifications

TD 92930EN
13 December 2013 /Ver B
Configuration Manual
WL3 and WL3 Plus WLAN Handset
97
Appendix C: Easy Deployment
Option 43:
The code for the option is “43”, and its minimum length is 1. The number i1 … etc refers
to information bytes. The length value n refers to the amount information bytes in the
field.
The value of the length octet does not include the two octets specifying the tag and
length
Option 43 with “Encapsulated vendor-specific information”:
Normally a vendor needs to have multiple parameters to be used for configuration of
the clients. Then the options are encoded using the "Encapsulated vendor-specific
extensions". This format uses the TLV syntax (type length value), and is described in
RFC 2152. When “Encapsulated vendor-specific extensions” are used, the information
bytes 1-n have the following format:
The different information bytes, sub-options, are in daily language called “tags”.
The tags codes are numbered options, created by the vendor like 01, 02, 83, 243 etc.
In the table above, the code for the option is “43”, as well as the total length, are
omitted.
NOTE: Depending on the system that is used to configure the DHCP options, an
administrator can enter each sub-option separately, or enter all values in a single
concatenated string. Since each value contains a header, a length field, and the
parameter itself, this can be difficult to enter correctly. Some servers require the entry of
values in the hexadecimal format, while others use ASCII strings.
For the handset, the option 43 sub fields are defined according to the following table:
The code 255 is used as an optional marker of the end of the vendor field.
When entering this information in a DHCP server, the administrator must observe that
the field length of the IP address can vary, depending on the amount of digits used. If,
for example, using the address of 10.30.5.7, the length is 6 numbers, plus 3 dot-
separators in all 9 bytes. If using an IP address like 192.168.100.101, the length is 15
bytes. Some server interfaces can assist in calculating the length.
Example:
To deploy a handset against a WSG, with IP address 10.30.4.120, the following data is
be sent as option 43:
Code Length Vendor specific information elements
43 (2b) n i1 i2 i3 etc.
Code
(tag)
Lengt
h
Data items Code Lengt
h
Data items Cod
e
Length
T1 n D1 D2 ... T2 n D1 D2 ... ... ...
Code
(tag)
Length Data items Cod
e
Length Data items Code
(optional
)
01 7
Siemens 02 7-15 IP v4 address to WSG (Device
Manager) (dot-decimal)
255
Hexadecimal: 01:07
:53:69:65:6D:65:6E:73:02:0B:31:30:2E:31:32:2E:31