User manual

DTS Broadcast PDH Microwave Digital Radio User Manual
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The service card in IDUs will be replaced by switch-connection card. And the service card will
mounted in protection switch. Traffic connections between the protection shelf and IDUs are made on
the front panel. The traffic interfaces are SCSI68 and RJ-45.
The protection switch monitors both co-located IDUs and, upon an alarm status change in either
IDU, makes a decision as to which of the IDU should be on-line (carrying traffic). Alarm, status, and
power connections to the controller from IDUs are made at the snmp of each unit.
The choice of operation in Hot Standby or Frequency Diversity or Space diversity protection
mode is suit for all service card, including 4E1,8E1,16E1, and 10/100BASE-T services.
The choice of operation in Hot Standby or Frequency Diversity is set by the redundant system
controller.
7.4 Protected system theory
Except the service card, the IDU in unprotected system is same as in protected system. In
unprotected system, the service card is mounted in IDU.
In protected system, the switch-connect card is mounted in IDU, and the service card is mounted
in Protection Switch to supplying services such as 4E1,8E1,16E1,10/100BASE-T+1/2/4E1 and 1E3
services.
See Figure 7-13, it descripts the based theory of protection switch. The Protection Switch consists
of DC/DC power, hitless switch system, switch state mechanical, service connector, and auxiliary data
connector. Figure 7-13 Bbased theory of protection switch