Comtech EF Data CRS-311, Installation And Operation Manual

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CRS-311 1:1 Redundancy Switch Revision 7
Introduction MN/CRS311.IOM
1–2
the Redundant Modem to ‘bridge’ the Traffic Modem. The Switch automatically configures the
Redundant Modem to match the configuration of the Traffic Modem. The Switch also copies the
Traffic Modem’s terrestrial transmit clock/data and routes it to the Redundant Modem, along
with the Traffic’s Modem’s Rx IF, via use of the CRS ‐ 281x IF Switch Module – see Sect. 1.3.6
CRS ‐ 281x IF Switch Modules . Because of this, no external test equipment is needed to
determine the health of the Redundant Modem – live traffic is used at all times to verify
performance.
Figure 1-2. CRS-311 System-Level Block Diagram
Construction Features: The CRS ‐ 311 is modular in construction. All replaceable modules are
installed into slots provided at the rear panel – this includes the CRS ‐ 230 System Controller;
Traffic Modem Interface (TMI); Redundant Modem Interface (RMI); Overhead Module; IF
Modules; and Power Supply Units (PSUs).
Power consumption is below 25 watts for a fully populated Switch; no fan cooling is required.
CRS ‐ 311 Key Reliability Features:
•
Twin, independent, AC or DC power supplies.
•
Primary traffic paths are maintained, error ‐ free, when power is removed.