30 Network deployment– requires security by the supported authentication and encryptionmethod (for example, WPA-PSK, WEP)– requires full access to internet after the device is associated withthe AP— Communication with the trusted Enterprise IP network– uses a VPN router– accesses the communication server with the internet-accessibleIP address of the VPN router• Enterprise wireless network (trusted)— Communication with MCC 3100 for Windows Mobile– uses an Enterprise AP and the configured authentication (forexample, WPA-PSK)– requires full access to the trusted Enterprise network— Communication with the trusted Enterprise IP network– uses a WLAN Security switch for direct access to thecommunication serverHigh availabilityThe MCC 3100 for Windows Mobile supports 1+1 redundancy. The CS 1000NRS-SPS in the redundant configuration has two distinct IP addresses:one for the active SPS and one for the inactive SPS. By configuring theprimary and alternate SPS addresses in the mobile device, the MCC 3100for Windows Mobile can switch from one SPS to the other in the event thatone SPS stops working.Figure 3 "MCC 3100 for Windows Mobile high availability configuration"(page 31) shows an example of a high availability configuration.Nortel Mobile Communication 3100 Series PortfolioNortel Mobile Communication 3100 — Planning and EngineeringNN42030-200 01.09 StandardRelease 2.0 1 November 2007Copyright © 2007, Nortel Networks.