Siemens TIM 1531 IRC Operating Instructions Manual page 333

When sending an SMS message, the message is first sent to the SMSC, buffered there and
then forwarded to the recipient.
Spontaneous / conditional spontaneous / unconditional spontaneous frame
● Spontaneous frame
In SINAUT networks, data frames are always transmitted spontaneously; in other words,
data are created and transmitted only when changes to process values occur or event-
controlled. These messages are known as spontaneous messages.
● Conditional spontaneous frame
In the dial-up network, you can specify whether or not a change causes a "conditional
spontaneous" or "unconditional spontaneous" transmission for each individual message.
Conditional spontaneous messages are initially only entered in the send buffer of the
TIM. They are only transmitted when a connection is established to the partner for
whatever reason, for example because an unconditional spontaneous message needs to
be transmitted or because the partner calls.
Even when using pay by volume transmission in a GPRS network, message prioritization
"conditional spontaneous" can also be used. Such a message is not transmitted
immediately, but is first buffered. In a GPRS network, the TIM stores "conditional
spontaneous" messages in the following situations:
– When the collected frames reach or exceed a size of 202 bytes.
– An important frame ("unconditional spontaneous" or "spontaneous" priority) should be
– The collected frames have not yet reached a volume of 202 bytes, but the TCP/IP
– The fill level of the send buffer has reached 90% of its maximum capacity.
● Unconditional spontaneous frame
In the dial-up network, you can specify whether or not a change causes an "conditional
spontaneous" or "unconditional spontaneous" transmission for each individual message.
Unconditional spontaneous messages cause the connection to be established
immediately. Even with pay-by-volume/time transmission in a GPRS network, you can
use the message prioritization "unconditional spontaneous"; in other words, in contrast to
a "conditional spontaneous" message, a message is transmitted immediately.
Spontaneous mode
The spontaneous mode is a method of SINAUT data transmission in which subscribers can
exchange data among themselves directly. Here, no central entity is necessary in the form of
a master TIM as in polling mode (see "Polling mode"). The spontaneous mode is intended
for data transmission in dial-up networks and for communication via IP-based networks.
For transmission in a dial-up network and in pay-by-volume/time IP-based networks (for
example GPRS), the data to be sent is assigned different priorities during parameter
assignment ("high" or "normal", with TD7onTIM also "alarm"). When data with high or alarm
priority are ready for transmission, the dial-up connection is established immediately. If the
data has "normal" priority, it is first stored on the TIM. This data is then sent the next time a
TIM 1531 IRC
Operating Instructions, 02/2018, C79000-G8976-C468-02
transmitted immediately.
keep-alive interval expires.
Glossary
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