Comtech EF Data CRS-500 - Manual (Page 30)

CRS-500 1:N Redundancy System Revision 2
Introduction MN-CRS500
1–4
1.2 Features
Key reliability features of the CRS-500 follow:
• Flexible configuration – 1:10 (maximum) for standard redundant operation
• Primary traffic paths are maintained, error free, when power is removed
• No interruption of traffic data when Traffic Modem Interface (TMI) modules are
removed
• Dual independent & hot-swappable/uninterrupted AC or DC power supplies
• Bridged (hot-standby) Traffic Modem(s) ensure quick availability for backup
• Programmable holdoff times to back up or restore
• Modem Prioritization – You may define which Traffic Modem takes operational priority
• Audible alarm – Programmable to activate based on various changes in status
• Remote (serial or Ethernet) Monitor and Control (M&C)
• Multiple user interfaces (Web/HTTP, SNMP, Telnet, EIA-232/485, front panel)
• An LED summary panel shows switch and modem status, bridge and online/offline
status
Construction features: The CRS-500 is modular in construction. The Data Switch Unit (DSU)
utilizes a Redundant Modem Interface (RMI) and Traffic Modem Interfaces (TMIs) – replaceable
modules that are installed into slots in the DSU front panel.
Ease of Connection: Connection to the Traffic modems and Redundant Modem is remarkably
easy – rack cabling is simplified and the number of potential failure points is reduced.
TMI Monitoring: Terrestrial user clock and data signals to and from a Traffic Modem are routed
through a TMI via a set of relays. This is arranged so that the de-energized (unpowered) state
connects the data signals directly through to the Traffic Modem. If the power supplies to the
system are lost, or if a traffic-carrying TMI is removed, no interruption of the traffic occurs.
CRS-282xx Options: The CRS-282xx IF Switch Units (ISUs) are required when the Traffic modems
within the redundancy group connect to more than one up/down converter. The Traffic
modems can also be used when one or more modems within the redundancy group connect to
the other polarization of the antenna or to multiple antennas.