RAD Data comm IPmux-1E operation manual Network Timing Schemes, External Network Timing

Chapter 1 Introduction IPmux-1/1EInstallation and Operation Manual

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.

Clock from External Distribution Network

	E1/T1			E1/T1
	E1/T1	IPmux-1	IPmux-1	E1/T1
E1/T1 Device				LBT Mode	E1/T1 Device
			IP over
	LBT Mode		Ethernet
				E1/T1
		IPmux-1	IPmux-1	E1/T1
E1/T1 Device LBT Mode				LBT Mode	E1/T1 Device

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

E1/T1 Device					E1/T1 Device
			IP over		E1/T1
		IPmux-1	Ethernet		E1/T1
LBT Mode				IPmux-1
	External				LBT Mode
	Clock Mode

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).

1-16 Functional Description

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