RAD Data comm IPmux-1 - Manual (Page 24)

Chapter 1 Introduction IPmux-1/1E Installation and Operation Manual
1-16 Functional Description
Network Timing Schemes
The following paragraphs describe typical timing schemes and the correct timing
mode settings for achieving end-to-end synchronization.
External Network Timing
When the edges of the network are synchronized according to an external
network clock source, all the IPmux-1 units should be configured to work in
loopback timing mode (see Figure 1-12). This topology enables any-to-any
connectivity.
IPmux-1
E1/T1 Device
E1/T1
E1/T1
Clock from External Distribution Network
LBT Mode
IPmux-1
E1/T1 Device
E1/T1
E1/T1
LBT Mode
IPmux-1
E1/T1 Device
E1/T1
E1/T1
LBT Mode
IPmux-1
E1/T1 Device LBT Mode
IP over
Ethernet
Figure 1-12. IPmux-1 in Loopback Timing Mode
External timing from the network can also be issued to IPmux-1 by External Clock
input; in this case, the E1/T1 device will use the LBT mode.
Clock from External Distribution Network
IPmux-1
E1/T1
E1/T1
E1/T1 Device
LBT Mode
E1/T1 Device
IPmux-1
External
Clock Mode LBT Mode
IP over
Ethernet
Figure 1-13. IPmux-1 in External Clock Mode
Single Source Clock Network
When a common clock is not available on all the ends of the network one of the
IPmux-1 devices is configured to work in Loopback timing mode, while the other
IPmux-1 device is configured to work in Adaptive timing mode (see Figure 1-14).
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