Справочник Пользователя для RAD Data comm IPmux-11
Installation and Operation Manual
Chapter 1 Introduction
IPmux-11 Ver. 2.00
Functional Description
1-9
Table 1-2. TDMoIP Frame Structure
Field Length (Bytes)
Field
7 Preamble
1
1
SFD
6
Destination MAC Address
6 Source
MAC
Address
2 Type
1 Vers/HLEN
1 Service
1 Vers/HLEN
1 Service
Type
2 Total
Length
2 Identification
1
1
Flags/Fragment Offset (most)
1
Fragment Offset (least)
1
Time to Live
1 Protocol
2 Header
2 Header
Checksum
4
Source IP Address
4
Destination IP Address
2
UDP Source Port
2
UDP Destination Port
2
UDP Message Length
2 UDP
Checksum
... Payload
4 CRC
The UDP Source Port value calculation depends on the selected TDMoIP version
(1 or 2):
• TDMoIP version 2: The UDP Source Port value equals 0x2000 + Destination
(1 or 2):
• TDMoIP version 2: The UDP Source Port value equals 0x2000 + Destination
Bundle Number, it is always greater than 8192.
• TDMoIP version 1:
During normal operation the UDP Source Port value equals Destination
Bundle Number + 1 (for example, for bundle 1 the UDP Source Port equals
Bundle Number + 1 (for example, for bundle 1 the UDP Source Port equals
2). The allowed range for the UDP Source Port values in the normal state is
from 0 to 8191.
from 0 to 8191.
If a bundle is in the local fail state, the MSB of the UDP Source Port is set to
1 to indicate the local fail state to the remote equipment. In this case the
UDP Source Port value equals 0x8000 + Destination Bundle Number + 1.
The UDP Source Port value in the local fail state is always greater than
32768.
1 to indicate the local fail state to the remote equipment. In this case the
UDP Source Port value equals 0x8000 + Destination Bundle Number + 1.
The UDP Source Port value in the local fail state is always greater than
32768.
ETH
Layer
IP Layer
ETH
Layer
Layer
UDP
Layer
Layer
Data
Layer
Layer
LLC
Layer
Note: IEEE 802.1p&Q VLAN
Tagging (additional 4 bytes if
enabled)
enabled)
The UDP source port field is
used to transfer a destination
bundle number. See Note
below.
Note