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Service manual AlphaCom PSTN2IP ML transceiver Rev. 1.6 10-09-2011 Page 12/65
The difference with an integrated GSM module (like in the AlphaCom XL GPRS) and an external GSM
interface is that the external GSM interface uses a GSM audio connection to transmit the original PSTN
protocol via a GSM (audio) connection to the central station. The integrated GPRS (IP over GSM) modules
sends data packages over GPRS to the central station and more advanced and more reliable.
Finally a LAN connection has to be made. Connect the AlphaCom PSTN2IP ML to a free LAN output of a
router or switch. The ALPHACOM XL uses a 10Mbit/s connection and it is preferred to use a “straight
through” CAT5 cabling. When making a custom-made LAN cable, it is strongly recommended to use the
standard color scheme for the wiring, see appendix B.