ZyXEL ISG50-PSTN User Guide - Page 251
Cellular Configuration Screen 3G
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Chapter 12 Interfaces Table 68 Configuration > Network > Interface > PPP > Add (continued) LABEL MTU Connectivity Check Enable Connectivity Check Check Method DESCRIPTION Maximum Transmission Unit. Type the maximum size of each data packet, in bytes, that can move through this interface. If a larger packet arrives, the ISG50 divides it into smaller fragments. Allowed values are 576 - 1492. Usually, this value is 1492. The interface can regularly check the connection to the gateway you specified to make sure it is still available. You specify how often the interface checks the connection, how long to wait for a response before the attempt is a failure, and how many consecutive failures are required before the ISG50 stops routing to the gateway. The ISG50 resumes routing to the gateway the first time the gateway passes the connectivity check. Select this to turn on the connection check. Select the method that the gateway allows. Select icmp to have the ISG50 regularly ping the gateway you specify to make sure it is still available. Check Period Check Timeout Check Fail Tolerance Check Default Gateway Check this address Check Port Related Setting Configure WAN TRUNK Policy Route OK Cancel Select tcp to have the ISG50 regularly perform a TCP handshake with the gateway you specify to make sure it is still available. Enter the number of seconds between connection check attempts. Enter the number of seconds to wait for a response before the attempt is a failure. Enter the number of consecutive failures before the ISG50 stops routing through the gateway. Select this to use the default gateway for the connectivity check. Select this to specify a domain name or IP address for the connectivity check. Enter that domain name or IP address in the field next to it. This field only displays when you set the Check Method to tcp. Specify the port number to use for a TCP connectivity check. Click WAN TRUNK to go to a screen where you can configure the interface as part of a WAN trunk for load balancing. Click Policy Route to go to the screen where you can manually configure a policy route to associate traffic with this interface. Click OK to save your changes back to the ISG50. Click Cancel to exit this screen without saving. 12.5 Cellular Configuration Screen (3G) 3G (Third Generation) is a digital, packet-switched wireless technology. Bandwidth usage is optimized as multiple users share the same channel and bandwidth is only allocated to users when they send data. It allows fast transfer of voice and non-voice data and provides broadband Internet access to mobile devices. Note: The actual data rate you obtain varies depending on the 3G card you use, the signal strength to the service provider's base station, and so on. You can configure how the ISG50's 3G device connects to a network (refer to Section 12.5.1 on page 253): ISG50 User's Guide 251