Iridium: trasmissione dati, E-mail, Internet

Trasmissione dati: termini di riferimento

Short Burst Data (SBD)

Definition: The unit sends data in packets (maximum file size 1960 bytes for 9522A or 205 bytes for 9601A), that are received by the user as binary attachments to emails. For transmission to the remote unit the file is sent as an email attachment and waits at the Iridium gateway until the unit calls in (maximum file 1890 byte for 9522A or 135 bytes for 9601A). For longer data strings, multiple messages can be transmitted. Trident provides software for extraction of the data to spreadsheet.

Dial-up (circuit switched) - PUNTO-A-PUNTO

Definition: This is using an Iridium modem to call another Iridium modem or a land-line modem. For satellite to land-line, the call is connected through the satellite network to the gateway and then on to the Public Switched Telephone Network (PSTN). For satellite modem to satellite modem, the connection is routed through the satellite network to the gateway and then back through the network to the other unit. This service may be used to dial into an Internet Service Provider for web and email access.

RUDICS - Router based Unrestricted Digital Interworking Connectivity System

Definition: This is an access/termination capability where the system allows telnets into, and out of, the gateway. When an Iridium modem places a call to the RUDICS Server, located at the Iridium Gateway, the RUDICS Server connects the call to a pre-defined IP address allowing an end-to-end IP connection between the Host Application and the Iridium modem.

There are three advantages over the conventional PSTN circuit-switched data connectivity or mobile-to-mobile data solutions: 

(1) elimination of analog modem training time, 

(2) increased call connection quality, reliability, and maximized throughput 

(3) protocol independence.

Short Message Service (SMS)

Definition: The unit sends and receives text messages. Each SMS message can be up to 160 text characters (7-bit coded) in length. The text characters are based on a 7-bit alphabet, which is encoded and transmitted as 8-bit data, hence the 140 byte maximum message size. Lease-line & Virtual Private Network (VPN)

Voice

Definition: Telephone calls made to and from the satellite unit via a land line phone or other satellite phone. For satellite to satellite calls the connection is established via the gateway but the gateway drops out of the link once the connection is established