ISDNguard
The Junghanns.NET
ISDNguard is an automatic layer 1 failover switch that has been exclusively designed for the Asterisk™ open source PBX. It can be used for various failover scenarios that require a physical reconnection of up to 4 BRI/PRI interfaces (see Application 1 and 2).
The Asterisk™ server provides a heartbeat to the
ISDNguard over a serial (RS232) interface. If the heartbeat stops the
ISDNguard will go into failover state, directly connecting the ISDN NET with the ISDN CPE ports indicated
by the red failover LED.
In normal operation the heartbeat stops whenever the Asterisk™ server is stopped. A configuration option allows the heartbeat to continue if the Asterisk™ server was cleanly shut down. Multiple
ISDNguards can be cascaded so they can be switched by a single Asterisk™ server with a single RS232 interface.
In case of a power failure the
ISDNguard will automatically fall back to failover state.
Target Applications
Integration of ISDN equipment
PBX with redundant BRI/PRI ports
Redundant VoIP gateways
Layer 1 port switch
LEDs
Power ok (green)
Heartbeat ok (green)
Failover Modus (red)
Requirements
Linux / *BSD operating system
RS232 (D-SUB 9) interface
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Casing
19" rack mountable
1 unit in height
brushed stainless steel
Interfaces
1 RS232 (heartbeat)
2 DIN5 (cascading)
4 shielded RJ45 (ISDN CPE)
4 shielded RJ45 (ISDN NET)
4 shielded RJ45 (Asterisk CPE)
4 shielded RJ45 (Asterisk NET)
4 shielded RJ45 (octoBRI ISDN)
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