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Digi m10 Technical Overview
3.2
Gateway Earth Station (GES)
The role of the Gateway Earth Station (GES) is to provide an RF communications link between
the message switch and the satellite constellation. It consists of medium gain tracking antennas,
RF and modem equipment, and communications hardware and software for sending and
receiving data packets. The GES equipment and site are designed for unattended operation. The
GES uses radome-enclosed, VHF full-motion antennas with approximately 17 dB of gain. Two
fully independent antenna systems, and associated RF and control equipment, provide complete
functional redundancy at a GES site.
3.3
Subscriber Communicator (SC)
The term Subscriber Communicator (SC) refers in general to the satellite modem or a device
incorporating a satellite modem.
3.4
SC Terminated
Messages sent to the SC from the GES
To learn more, please refer to corresponding sections in the ORBCOMM Serial Interface
Specification document, which is included on the Digi JumpStart Kit CD.
3.5
SC Originated
Messages sent from the SC to the GES
To learn more, please refer to corresponding sections in the ORBCOMM Serial Interface
Specification document, which is included on the Digi JumpStart Kit CD.
3.6
Global Gram
Global Gram messaging, or store-and-forward message transfer, is available in instances when a
satellite is in view of a satellite modem, also referred to as Subscriber Communicator (SC), but
there are no ORBCOMM gateways connected to the satellite. Examples of such instances
include ocean areas and locations where there is no gateway, but regulatory approval for a
satellite modem to communicate with a satellite has been granted. Global Grams allow satellites
and satellite modems to archive short messages when the destination ORBCOMM gateway is
inaccessible by the satellite constellation. The stored messages are transmitted when an
ORBCOMM Gateway comes into satellite-transmission range. This concept applies to both
sending (SC-Originated) and receiving (SC-Terminated) from a satellite modem point of view.
Digi International, Inc. ? 2009
Page 13 of 24
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