Siemens manual AC75 AT Command Set

AC75 AT Command Set

1.6 Serial Interface Flow Control

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of data, data throughput, reaction time of the application when handling the buffer, processor performance and available memory. To give an example, a small buffer size (such as 256 bytes) increases the frequency of deactivating RTS/CTS and the frequency of flushing the buffer, thus diminishing the efficiency of the appli- cation.

Also, please consider that RTS/CTS flow control cannot stop the data stream coming from the network, e.g. in a GPRS or fax connection. So the lack of appropriate hardware flow control increases the risk of losing data packets if, like in the case of UDP, the connection protocol has no or only minimum error handling functions. Other network protocols are using high level flow control mechanisms. For example, to prevent loss of data the TCP protocol uses retransmission algorithms, fax applications usually repeat the transfer of faulty pages.

AC75_ATC_V01.002	Page 27 of 569	10/30/06
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