RAD Data comm IPmux-11 operation manual Network Timing Schemes, External Network Timing

Installation and Operation Manual Chapter 1 Introduction

•Internal timing – in this mode, the Tx clock is derived from an internal oscillator.

•External timing – in this mode the Tx clock is derived from the external clock input. The external clock port also outputs the input clock signal to allow connection to other units, if needed.

Note In adaptive timing the regenerated clock is subject to network packet delay variation. That is why the quality of the adaptive clock depends on the quality of the network.

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-11 units should be configured to work in loopback timing mode (see Figure 1-3). This topology enables any-to-any connectivity.

Figure 1-3. IPmux-11 in Loopback Timing Mode

External timing from the network can also be issued to IPmux-11 by external clock input.

IPmux-11 Ver. 2.00 Functional Description 1-7