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MP875 Modem User Guide
16 2130808
TheMPmodemVSPsareavailableonbothUSBandEthernet
interfaces.Forinformationonenablingavirtualserialport,see
theMP3GModemsATCommandReferencemanual(document
#2130810).
VPN support for RNAP
ThisfeatureallowsfortheexchangeofRemoteNetwork
AccessProtocol(RNAP
1
)databetweentheMPmodemanda
remoteserveraccessibleonlythroughaVirtualPrivate
Network(VPN)connection.Whenusingthisfeature,youmust
have3GWatcherrunningonthecomputer.
TheMPmodemsendsRNAPdataoverEthernetorUSBto3G
Watcheronthecomputer.3GWatcherplacestheRNAPdatain
aUserDatagramProtocol/InternetProtocol(UDP/IP)packet
andsendsitovertheVPNconnectiontotheserver.When3G
WatcherreceivesaUDP/IPpacketcontainingRNAPdataover
theVPNconnection,itdisassemblesthepacketandsend sthe
RNAPdatatotheMPmodem.
Youcanenablethisoptionusing3GWatchersoftwareorAT
commands.Seethe3GWatcheronlinehelpandtheMP3G
ModemsATCommandReferencemanual(document#2130810)
fordetails.
Software
TheMPmodemcomeswiththefollowingsoftware:
• 3GWatcher,thesoftwarefortheMPmodemwhichallows
youtomanageandmonitoryourconnections.
• ThedriverthatformstheinterfacebetweentheMP
modemandyourWindowsoperatingsystem.
• Thefirmwarethatisstoredinnon‐volatilememory.
TheMPmodemhasanembeddedradiomodule(a
Mini
Card8775),alsomadebySierraWireless,Inc.There
aretwofirmwareprogramsontheMPmodem—one
storedonthecontrollerboardoftheMPmodemandone
ontheradiomodule.
Thefirmwarewasloadedintotheradiomoduleandcon‐
trollerboardwhentheMPmodemwasassembled.Asnew
1. RNAP is a Sierra Wireless proprietary protocol that encapsu-
lates the MTP data that is sent to and from the MP modem. It
ensures that both the MP modem and remote host recognize
the data packets. See The Monitoring and Tracking Protocol
Guide on
page 18.