Specifications

IPmux-1/1E Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-15
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 by an external network clock
source, all the IPmux-1 units should be configured to work in loopback timing
mode (see Figure 1-13). This topology enables any-to-any connectivity.
E1/T1 Device
E1/T1
E1/T1
Clock from External Distribution Network
IPmux-1
E1/T1 Device
E1/T1
E1/T1
LBT Mode
IPmux-1
E1/T1 Device
E1/T1
E1/T1
LBT Mode
E1/T1 Device
IPmux-1
LBT Mode
IPmux-1
LBT Mode
IP/Ethernet
Figure 1-13. 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
External
Clock Mode
LBT Mode
IP/Ethernet
Figure 1-14. 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 1-15).