Airlink EDGE/GPRS - Manual (Page 37)

PinPoint-E EDGE/GPRS - User Guide, version 2.32 31
Data Communication and Host Modes
Keepalive
Keepalive is used to test the PinPoint-E’s connection by pinging an IP address after a specified
period of inactivity. Keepalive is only recommended for users who have a remote terminated
modem that infrequently communicates to the network or if you have experienced issues over time
where the modem can no longer be reached remotely.
When Keepalive pings the IP address, an acknowledgement indicates there is an active connection
to the network. If the PinPoint-E does not receive a response from the IP address, it will make addi-
tional attempts according to a backoff algorithm before determining the Internet connection is not
functioning properly. If it determines the connection is not fucntioning, the modem will then
attempt to reconnect to Your Wireless Service Provider to reestablish IP connectivity.
Configuring Keepalive
You can use Wireless Ace or a terminal connection to configure Keepalive (page 62). In Wireless
Ace, select Other from the groups menu on the left.
FIGURE 7. Wireless Ace: Keepalive Configuration
*IPPING sets the interval, in minutes, you want Keepalive to test the network connection. To
disable Keepalive, set *IPPING to 0 (default setting).
*IPPINGADDR sets the IP address you want to use for the connection test.
Data usage using Keepalive
Keepalive is an optional feature. If you frequently pass data with your modem, you most likely do
not need to have Keepalive enabled. When using Keepalive, be aware that a ping moves approxi-
mately 66 bytes of data over the network and is billable by the carrier. The following *IPPING
settings will incur approximate monthly data usage in addition to any other data usage:
Note: 15 minutes is the minimum time which can be set for Keepalive.
15 minutes 400k / month
30 minutes 200k / month
60 minutes 100k / month
120 minutes 50k / month
Caution: If *IPPINGADDR is left blank or is set to an invalid IP address (exam-
ple, an IP which is unreachable or one which is not a valid IP address), modem
performance will be adversely affected.