Digi M10 - Manual (Page 10)

Digi m10 Technical Overview
Digi International, Inc. © 2009 Page 10 of 26
When receiving a message through the Digi m10, a user creates a message using an SMTP
client and sends it to the ORBCOMM GCC using the appropriate e-mail address (typically
serial#[email protected] for North America or serial#[email protected] for the rest of the
world). When the message is received by the GCC, the GCC transmits it through the GES to the
satellite in orbit, which then transmits the message down to the Digi m10. Once the message is
received by the Digi m10, the user can query for the message serially. Note the Data Available
signal asserts when the Digi m10 has received a message.
The message packets sent between the Digi m10 Satellite Modem and the Satellite are optimized
at 107 bytes of user data. This allows for a single packet to be sent to the Satellite with a single
acknowledgement back. After that, the next optimized size is 228 bytes of user data, and then in
111 byte increments.
Alternatively, users can provision their Digi m10 Satellite Modems for IP Gateway usage. This
usage allows customers to use HTTP POST and GET commands with XML to send and receive
messages against a specified host server. When the Digi m10 Satellite Modem is set up for an
IP Gateway account, speed dial 1 is used to route messages to the host server.
Note: If the Digi m10 is powered off, all existing messages in its transmit and receive
queues are lost.