A_E_Specification_enUS_2664119691.doc

If the programmable time window for a specific

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If the programmable time window for a specific network account expires without a valid message being received, the Central Station Receiver shall generate a trouble message, indicating a loss of supervision for the indicated control panel. o If a valid message is subsequently received, the Central Station Receiver shall generate a message indicating a restoration of supervision for the indicated control panel. If the DCM sends ten successive heartbeat messages to the Central Station Receiver without receipt of an ACK, the DCM will fall into a "network communication failure" condition (Fallback Mode). o While in Fallback Mode, the DCM will disconnect the control panel from the network. o The DCM can be configured to connect the control panel to a PSTN line when the DCM is in Fallback Mode. o While in Fallback Mode, the DCM will continue to poll the Central Station Receiver using periodic heartbeats. o The DCM will exit Fallback Mode when an ACK is received from the Central Station Receiver. If the control panel sends, by way of the NIM, a programmable number of successive heartbeat messages to the Central Station Receiver without receipt of an ACK, the control panel will fall into a "network communication failure" condition. o After a network communication failure, the control panel will continue to poll the Central Station Receiver using periodic heartbeats. o The control panel will indicate the restoration of supervision after an ACK is received from the Central Station Receiver. 2.6.2 Anti-Substitution/Anti-Replay Conettix IP shall protect against the substitution of a valid control panel with a fraudulent one. Conettix IP shall also protect against the interception and retransmission of authentic control panel messages, preventing an attack in which a valid data transmission is recorded and fraudulently repeated by an adversary who intercepts the data and retransmits it. Control panels that are connected to the Central Station Receiver by way of the Network Interface Module (NIM) are responsible for their own Anti-Substitution/Anti-Replay protection. Control panels that connect via the Dialer Capture Module (DCM) rely on the DCM to provide Anti- Substitution/Anti-Replay protection. Conettix IP A&E Specifications 45998C Page 14 © 2005 Bosch Security Systems
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Conettix IP Architectural & Engineering Specifications At startup of each control panel or DCM, Conettix IP shall coordinate the synchronization of messages between the network modules and the Central Station Receiver. Once synchronized, all subsequent communication sessions numerically validate the authenticity of the sender and receiver, which protects against the replay of authentic sessions, or the substitution of the original control panel or DCM. If Anti-Substitution/Anti-Replay protection is enabled, the Central Station Receiver must receive a valid synchronization key within a programmable number of messages, or a Substitution Alarm message will be generated. Unless the Central Station Receiver receives a valid key within a programmable additional number of messages, the control panel account will be disabled.
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