Editing Iridium Communications (section)

=== Iridium OpenPort ===
Iridium OpenPort is a broadband satellite voice and data communications system for maritime vessels. The system is used for crew calling and e-mail services on sea vessels such as merchant fleets, government and navy vessels, fishing fleets and personal yachts.<ref>{{cite web|title=Iridium OpenPort Global Service Program in Operation Effective April 1 |url=http://www.maritime-executive.com/pressrelease/iridium-openport-global-service-program-in-operation-effective-april-1 |publisher=The Maritime Executive |access-date=15 September 2011 |url-status=dead |archive-url=https://web.archive.org/web/20120320174824/http://www.maritime-executive.com/pressrelease/iridium-openport-global-service-program-in-operation-effective-april-1 |archive-date=20 March 2012 }}</ref>

Iridium operates at only 2.2 to 3.8&nbsp;[[Kilobit per second|kbit/s]], which requires very aggressive voice [[Data compression|compression]]<ref>US Patent application 20030195006</ref> and decompression [[algorithm]]s.<ref>{{cite web|url=http://www.mailasail.com/Support/Iridium-Bandwidth |title=Iridium Bandwidth and Internet Download Speeds – Support |publisher=MailASail |access-date=2016-02-24}}</ref> (By comparison, [[Adaptive Multi-Rate audio codec|AMR]] used in 3G phones requires a minimum of 4.75&nbsp;kbit/s, [[G.729]] requires 6.4&nbsp;kbit/s, and [[Internet Low Bitrate Codec|iLBC]] requires 13.33&nbsp;kbit/s.) Latency for data connections averages 1800&nbsp;[[Millisecond|ms]] round-trip, with a mode of 1300 to 1400&nbsp;ms and a minimum around 980&nbsp;ms.<ref name="latencyreport">{{cite web|url=http://www.dodccrp.org/events/10th_ICCRTS/CD/papers/233.pdf |title=MEASURING LATENCY IN IRIDIUM SATELLITE CONSTELLATION DATA SERVICES |author1=Margaret M. McMahon |author2=Ph. D |website=Dodccrp.org |access-date=2016-02-24}}</ref> Latency is highly variable depending on the path data takes through the satellite constellation as well the need for retransmissions due to errors, which may be around 2 to 3% for mobile originated packets under good conditions.