The node supports dual SIM deployment for users who require a redundancy option using two wireless carriers.
With dual SIM deployment, two SIMs are installed in the node, one from each carrier. Only one SIM is active at a time to establish a cellular service WAN connection. The operator choses which SIM is primary and which is secondary or manually selects which SIM to keep active.
Configurable criteria give the operator some control over when it is appropriate for the system to perform a SIM switchover. For example, the BGP operational state associated with the cellular port can be used as a criterion for determining when a SIM switchover should occur. If the BGP operational state is down for a specified interval, a SIM switchover occurs. See Criteria for automatic failover for more information.
A SIM switchover is service-affecting. Operators should perform a SIM switchover only when necessary, as overly frequent switchovers will impact service operation.
Figure: Dual SIM operation shows dual SIM operation on a 7705 SAR-Hm.
For information about IP/MPLS services when dual SIM functionality is enabled, see the 7705 SAR-Hm and SAR-Hmc Main Configuration Guide.