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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

Clock from External Distribution Network

LBT Mode

IPmux-1

E1/T1 Device

E1/T1

LBT Mode

IPmux-1

E1/T1 Device

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 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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