Heartbeat (Hb); Power Failure Protection - Datacom Systems DURAstream DS-1010 User Manual

Theory of Operation

4.2 Heartbeat (Hb)

DS-1010 can monitor the continual health of the appliance by sending and receiving Heartbeat (Hb) pulses.
This functionality ensures the real-time safety and accuracy of the data stream. Heartbeat frames are
generally configured to be sent from DS-1010 on one appliance port and received on the other under a set
time limit defined by a customer configured TIMEOUT value. For more information on TIMEOUT value,
see section '<variable> List for CLI
DS-1010 provides various heartbeat modes to correspond with different appliance configurations including:
Heartbeat Mode 1: Internal Heartbeat Frame Loop-back Mode:
In Heartbeat Mode 1, the heartbeat signal is a user programmable Ethernet "Heartbeat Frame" and
is generated by DS-1010 itself. The Heartbeat frames are sent out from DS-1010 Ethernet Port A1
every 100ms, and DS-1010 Ethernet Port A2 expects to receive the same Heartbeat Frame from
the appliance. Heartbeat Mode 1 for the DS-1010 is designed for network appliance units that act
as a bridge, like IPS or Firewall. The user needs to make sure the Network appliance is properly
configured so that the device will not filter out the "Heartbeat Frame".
In heartbeat Mode 1, no driver is needed for Appliance systems.
Heartbeat Mode 3: Link Status Heartbeat Mode:
In Heartbeat Mode 3, the heartbeat signal acts as the link up status indicator of the DS-1010
Ethernet Port A1 and A2. If any ports of A1 and A2 lose the link, DS-1010 will shut off heartbeat
transmission and activate bypass mode.

4.3 Power Failure Protection

DS-1010 provides two redundant power supply inputs to minimize the chance of power loss or failure.
In addition, DS-1010 continuously monitors the power supply voltage to detect any instance of power
decline or outage. If a power failure is detected, Power Fail Protection Operation is triggered, which
initiates a switch to Bypass Switch. During this no power state, the N1 and N2 ports will physically connect
to create a passive bypass path without any traffic interruption between port N1 and port N2.
© 2010 Datacom Systems Inc
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