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In CDPD mode, how many TCP/IP sessions can SB3XX support simultaneously?

April 26, 2017cdpd IP mode sb3xx sessions simultaneously support TCP

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In CDPD mode, how many TCP/IP sessions can SB3XX support simultaneously?

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There are actually two different functional modes for CDPD. They are distinguished by where the TCP/IP stack resides. If you are using a TCP/IP stack in the host device, then the modem acts as a pass-through for all IP data, and you can support as many sessions as the host device can handle. If you are using the internal TCP/IP stack, then you can only support 1 TCP session. The reason for this is that there is only 1 serial interface from the modem to the host, and therefore there can only be 1 logical session for passing the raw data over that link. If this weren’t the case, then the modem would have no way of determining which session raw data received from the local host was meant for.