Comtech EF Data CLO-10 - Manual (Page 85)

Appendix A. REDUNDANT
SYSTEM OPERATION
A.1 Introduction
The Comtech EF Data CLO-10 Link Optimizer, when operating with Firmware Version 1.2.1 or
later, can be configured for redundant system operation using a distributed Daisy Chain
configuration. This appendix provides detailed information for cabling, configuration and operation
of the CLO-10 Daisy Chain Redundancy System.
A.1.1 Overview
Intended for remote or hub applications, the CLO-10 Daisy Chain Redundancy System provides
fully manual and automatic protection of CLO-10 Traffic Units from a simple 1:1 pair to a fully-
configured 1:12 hub system.
Figure A-1 shows a CLO-10 1:1 Daisy Chain Redundancy configuration. Figure A-2 shows a
CLO-10 1:12 Daisy Chain Redundancy configuration.
The Redundancy operation is simple. The user will assign which of the Traffic Units will be part
of the redundancy system. All active Traffic Unit configurations will be “learned” by the
Redundant Unit. The Redundant Unit will then continually monitor for any faulted Traffic Units.
An automatic backup will occur if the Redundant detects a fault on any active Traffic Unit. In an
automatic backup, the Redundant Unit will first bridge the Traffic Unit by configuring itself the
same as the failed Traffic Unit. After remaining fault-free itself, the Redundant Unit will them
force the failed Traffic Unit offline and place itself online.
A High Speed Bus (HSB) provides the communications interface between the Redundant Unit
and Traffic Units.
For CLO-10 standalone operation, the units can have either interface card installed. The top-level
menu on the unit’s front panel Vacuum Fluorescent Display (VFD) identifies which card is
installed, displaying “CLO-10-1” for any unit equipped with an Input/Output Module (IOM), or
“CLO-10-2” for any unit equipped with an Input/Output Switch Module (IOSM).
For CLO-10 Redundancy, the Redundant Unit must have the IOM installed and each Traffic Unit
must have the IOSM installed.
A–1