4
Establishing a Data Connection
This chapter explains how to establish a data connection using either an external
protocol stack, the modem’s internal protocol stack, or an ECM connection with your
modem.
Much of the information contained in this chapter is detailed in the Huawei MU609
HSPA LGA Module Application Guide. This guide can be found by going to
www.zoomtel.com/4575suppport
. We strongly recommend that you review this guide as
it walks you through setting up your modem in several common applications.
Choosing How to Establish your Data Connection
Deciding how to establish your data connection depends on how you physically connect
your modem to your system as well as the capabilities of your system. The modem
supports three methods of establishing a data connection: using an external protocol
stack that is running on your application, using the modem’s internal protocol stack, or
using ECM dialing.
If you are connected to the modem with a serial port either through the modem’s DE-9
connector or through the modem’s header, you can establish a data connection by using
either an external protocol stack or the modem’s internal protocol stack. You may want
to use the external protocol stack if your application already supports TCP/IP/UDP or if
this support can be easily added. Use the modem’s internal protocol stack if your
application does not support TCP/IP/UDP and this support is difficult to add. To learn
how to connect using an external protocol stack, go to Using an External Protocol Stack
to Establish a Data Connection below. To learn how to connect using the modem’s
internal protocol stack, go to Using the Modem’s Internal Protocol Stack to Establish a
Data Connection.
If you are using the USB port, either though the modem’s micro USB connector or
through the modem’s header, you can connect using an external protocol stack through
the USB Modem port, or by using ECM dialing on the ECM port. The ECM port is
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