Technical data

Configuration software for SINAUT ST7
1.5 Setting TIM module parameters
Software
System Manual, 07/2009, C79000-G8976-C222-07
39
● Send Keepalives for Connections - Interval [s] (0-65535, 0 = off) :
This value specifies the interval in seconds at which keepalives are sent. If the value is
set to 0, no keepalive messages are sent.
For GPRS connections, a value of 120 seconds is recommended. The value can also be
selected here depending on the period in which the "conditional spontaneous" frames
stored on the TIM must be sent (see parameter
Send conditional messages as blocks ).
The keepalive interval should always be shorter than the interval for "dead peer
detection" (DPD) on the MD741-1 modem. On the MD741-1, the default DPD interval is
150 seconds.
●
Keepalive timeout [s] (0-255, 0 = default) :
This value specifies the monitoring time in seconds when sending a keepalive. The
acknowledgment of the message just sent must arrive within the monitoring time defined
here. If the value is set to 0, the internal TIM default value is used (1 second).
In GPRS networks, a message is usually acknowledged within 1 to 2 seconds. This may
take longer depending on the load on the GPRS network. Experience has shown that an
Ethernet timeout of 10 seconds is practical in GPRS networks.