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IPmux-1/1E Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-17
IP over
Ethernet
IPmux-1
E1/T1
E1/T1
IPmux-1
E1/T1
E1/T1
Adaptive Mode
Loopback Timing Mode
E1/T1 Device E1/T1 Device
Master Clock
Source Device
Remote Loopback
Timing Device
Figure 1-14. IPmux-1 in Adaptive Timing Mode
Adaptive
IPmux-4/16
LBT
LBT
V5.1
E1
Grooming of FXS
in E1 CAS
Grooming
of BRI
Megaplex
Telephone
Switch
IP over
Ethernet
ISDN
POTS
ISDN
ISDN
Adaptive
Adaptive
Figure 1-15. IPmux-1E in Adaptive Timing Mode
Frame Format
The Ethernet frame sent by the IPmux-1 is a UDP datagram that transfers E1/T1
payload bytes over IP over Ethernet (UDP payload + UDP header + IP header +
Ethernet header).
The UDP payload size is equal to TDM bytes per frame (TDM bytes/frame
configuration).
Table 1-2 specifies the structure of the different headers, special fields, and the
payload in the Ethernet packet.
MAC IP UDP
Payload
Figure 1-16. TDMoIP Frame Structure
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