User`s manual

Chapter 1 Overview
30
 In a point-to-point connection between two MUXpro, the only reason to
change the defaults is to adapt the MUXpro to change in the original
utilization of its ports.
1.6.7 Timing Subsystem
1.6.7.1 SDH Timing Subsystem for MUXpro with E1 Ports
MUXpro 82xx Clock Selection Diagram:
Figure 1-10 SDH Timing Subsystem (with E1 ports), functional diagram
Figure 1-10 shows the functional block diagram of the SDH timing subsystem for
MUXpro with E1 ports.
For redundancy, the timing subsystem includes two similar sections, one for
selecting the primary SDH clock reference and the other for the secondary clock.
The user can specify the SDH clock reference source from the following options:
 Automatic and revertible clock source switching: The reference source of the
recovered clocks can be selected automatically in accordance with the
primary or secondary clock of which status is normal. The primary clock
source will be selected if both primary and secondary clock statuses are
normal. In case of the primary clock source failed, MUXpro automatically
switches from the primary clock source to the secondary one. In case of the
primary clock source recovered, MUXpro automatically switches back from