Datasheet

____________________________________________________ DS34S101, DS34S102, DS34S104, DS34S108
Rev: 032609 40 of 198
Table 10-7. IPv4 Header Fields (UDP)
Field
Description
IPVER
IP version number. IPv4 IPVER=4
IHL
Length in 32-bit words of the IP header, IHL=5
IP TOS
IP type of service
Total Length
Length in octets of IP header and data
Identification
IP fragmentation identification
Flags
IP control flags; must be set to 010 to avoid fragmentation
Fragment Offset
Indicates where in the datagram the fragment belongs; not used for TDM-over-Packet
Time To Live
IP time-to-live field; datagrams with zero in this field are to be discarded
Protocol
Must be set to 0x11 to signify UDP
IP Header Checksum
Checksum for the IP header
Source IP Address
IP address of the source
Destination IP Address
IP address of the destination
Table 10-8. UDP Header Fields
Field
Description
Source Port Number,
Destination Port Number
Either the source or the destination port number holds the bundle identifier. The unused field can
be set to 0x85E (2142), which is the user port number assigned to TDM-over-Packet by the
Internet Assigned Numbers Authority (IANA).
For UDP/IP-specific OAM packets, the bundle identifier is all ones.
UDP length
Length in octets of UDP header and data
UDP checksum
Checksum of UDP/IP header and data. If not computed it must be set to zero.
10.6.1.3 UDP/IPv6 Header
Figure 10-14. UDP/IPv6 Header Format
0
0 1 2 3 4 5 6 7 8 9 0
1
0
2
0
3
1
IPVER TRAFFIC CLASS FLOW LABEL
PAYLOAD LENGTH
NEXT HEADER
HOP LIMIT
SOURCE PORT NUMBER DESTINATION PORT NUMBER
UDP LENGTH UDP CHECKSUM
IP
HEADER
UDP
HEADER
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
SOURCE IP ADDRESS
DESTINATION IP ADDRESS