Digi M10 User Manual download pdf (Page 13)

Digi m10 Technical Overview

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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

More documentation can be found on the kit installation CD. To learn more, navigate to

C:\Program Files\Digi\Digi m10 JumpStart Kit\documents please refer to either ORBCOMM Serial

Interface Specification > SC-TERMINATED MESSAGE or ORBCOMM Serial Interface

Specification > Figure 4.8 SC-Terminated Message.

3.5 SC Originated

Messages sent from the SC to the GES

More documentation can be found on the kit installation CD. To learn more, navigate to

C:\Program Files\Digi\Digi m10 JumpStart Kit\documents please refer to either ORBCOMM Serial

Interface Specification > SC-ORIGINATED MESSAGE or ORBCOMM Serial Interface

Specification > SC-ORIGINATED MESSAGE.

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

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Digi M10 User Manual Page 13