What are the various data communication methods over the GSM network and which connection types do NURIT GSM-enabled terminals support?
There are three types of data communication methods that exist over the GSM network: – Circuit-Switched Data (CSD) CSD data communication method is easy to implement at the application level. Its connection requires a similar configuration to a landline dial-up connection. It also requires that the host/NAC be capable of receiving a GSM data call. This communication method is based on asynchronous mode and uses the V.32 type protocol. Typically, one transaction can take up to several minutes to complete, rendering the cost of usage high. – Short Messaging Service (SMS) SMS data communication method uses asynchronous, store-and-forward short messages of up to 140 bytes on dedicated GSM signaling channels. There are 2 sub-modes in SMS data communication: – TXT mode, which implements 7-bit ASCII codes – PDU mode, which implements 8-bit codes Although ISO8583 messages have to be fragmented to 140-byte frames before sending, and re-packeted before being forwarded to the bank host, PDU mode
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