SmartEdge 600 Router Hardware Guide
5.3
Packet Mesh Architecture
The SmartEdge 600 router implements a grid of cross connections in its
backplane that allows any line card to communicate directly to any other line
card in the chassis. Each line card uses a combination of a Packet Mesh ASIC
(PMA) and Packet Processing ASICs (PPAs) to perform this function.
5.4
Redundancy
Redundancy features include:
•
Dual power connections, each with separate A-side and B-side power
connections
•
Redundant controller cards and redundant file systems
•
Redundant external timing sources, such as building integrated timing
supply (BITS) or synchronization supply unit (SSU), with internal timing
if both sources should fail.
5.5
Alarms
System alarms include:
•
Critical alarm—severe, service-affecting condition. It requires immediate
corrective action.
•
Major alarm—service-affecting hardware or software condition. It requires
immediate corrective attention.
•
Minor alarm—a condition that does not have a serious affect on service or
on circuits.
Pressing the ACO button silences an audible alarm and lights the ACO LED;
pressing the button again turns off the ACO LED. Support for the ACO button
depends on the release of the operating system.
5.6
System Status
The system status LEDs are located on the fan tray:
•
Power sources (A and B)
•
Fan
•
Alarm cutoff (ACO)
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