Globalstar MCM-4, Руководство по установке и эксплуатации

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G l o b a l s t a r M C M - 4 e I N S T A L L A T I O N
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Provisioning the Single Antenna MCM-4e
Service provisioning
Each of the four SDMs requires a Globalstar subscription. Note: The Globalstar subscription for each
SDM includes the provision of a telephone number that also allows each SDM to receive incoming
asynchronous data calls.
Roaming Outside of the ‘Home’ Service Area
Prior to delivery, the MCM-4e will have been configured to operate within the Globalstar service area
designated to be you’re the ‘home’ service area.
In addition to being able to operate anywhere within the designated ‘home’ service area, the MCM-4e is
capable of operating within any Globalstar service area with which your Globalstar service provides
roaming capabilities.
Although the MCM-4e has the inherent capability of operating within any Globalstar gateway, it may
require some minor user configuration changes if it is subsequently required to operate within another
Globalstar service area. Some Globalstar gateways support both ‘packet data’ calls and ‘asynchronous
data’ calls while other Globalstar service areas support only ‘asynchronous data’ calls. The MCM-4e
was designed to operate in ‘Packet Data’ mode. The MCM-4e can operate in a Globalstar service area
that only supports the ‘asynchronous data’ mode, but at a lower data rate
Notes: For current details of Globalstar’s ‘packet data’ and ‘asynchronous data’ service areas,
refer to Globalstar’s web site at http://www.globalstar.com/pages/coverage.html
A call is disconnected when the subscriber leaves the service area of the Globalstar gateway controlling
the call. Although ‘in-call hand-overs’ between neighboring service areas are not supported on the
Globalstar system, the MCM-4e has the ability to maintain any VPN tunnels having more than one
Internet connection as the MCM-4e enters the neighboring service area. SDMs will disconnect and be
automatically reconnected by the MCM-4e to the Globalstar gateway controlling the neighboring
service area at different times. Thus, the VPN tunnel is likely to remain established (albeit with reduced
bandwidth through the transition period as each satellite modem connection is re-connected via the
Globalstar gateway serving the new service area).
Because certain Globalstar gateways have implemented Network Address Port Translation (1-N
NAPT) while others have implemented 1-1 Network address translation, the user of the MCM-4e
should ensure that the VPN tunnel does not use the IP(in IP) transport but instead uses TCP transport
within Globalstar areas where Network address port translation (1-N NAPT) is performed.