Specifications

Chapter 1 Introduction Installation and Operation Manual

1-16 Functional Description IPmux-8/16 Ver. 6.00

Table 1-1. TDMoIP Frame Structure (Cont.)

Field Length Field Notes

4 bits FORMID Format Identifier: AAL1, AAL2,

HDLC etc

1 bit R Bit Indicates Local loss of

Synchronization at the

opposite TDM side

1 bit

R Bit Indicates that the

opposite TDMoIP device

is not receiving packets

at the Ethernet port

4 bits RES Reserved

6 bits LENGTH TDMoIP packet length (CW

and payload). Used when total

packet length is less than

64 bytes. Otherwise is set to 0.

16 bits Sequence number Used by the receiving IPmux

to detect packet loss

...

Payload

4 bytes CRC

The UDP Source Port value calculation depends on the selected TDMoIP version

(1 or 2):

• 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

2). The allowed range for the UDP Source Port values in the normal state is

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.

• TDMoIP version 2: The UDP Source Port value equals 0x2000 + Destination

Bundle Number, it is always greater than 8192.

VLAN Support

IPmux-8/16 can be configured with or without VLAN support. If VLAN is selected,

then all the traffic originating from IPmux-8/16 must have 802.1 p&Q Ethernet

frame format. IPmux-8/16 supports service levels of traffic separation to different

VLANs. Every TDMoIP bundle has its own VLAN ID configuration.

Not

Control Word

MAC Layer

Data La