Qualcomm GSP-1620 Especificaciones Pagina 47

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GSP-1620 Modem Product Specification
80-99240-1 Rev. D 3-9
no mobility is involved, and the users application
requires a fixed IP address, then a fixed IP addressing
scheme should be used.
The difference is that in a fixed addressing scheme the
users application at a host site or server will always know the
IP address of the remote DTE (SCADA application). In a
dynamic addressing scheme, the IP address is not known
until the remote SCADA application/modem and the
host/server are in an active session. In both the fixed and
the dynamic addressing scheme, either the SCADA
application/modem or the host/server can initiate a call/IP
session.
Dynamic IP Addressing
A dynamic IP address pool in the Gateway can be configured
with either private IP addresses or globally routable IP
addresses. Therefore, the type of IP address assigned to a
dynamic IP user during call setup depends on the Gateway
configuration. With a dynamically assigned IP address, the
modem can roam to another Gateway and re-establish Packet
Data service by having the system automatically assign a
new dynamic IP address.
With dynamic IP addressing, the modem can initiate a call/IP
session with the host/server. Once a session is established,
the assigned IP addresses remain constant until the session
is terminated. With the added capability of dormant mode
(see Dormant Mode Service on page 3-10), the IP address
assigned during this session remains active even during
temporary gaps in air link coverage or when a call is
temporarily released via dormant mode.
Fixed IP Addressing
Fixed IP addresses can be assigned instead of dynamic IP
addresses. With a fixed IP address, the server or host
application can use a given specific IP address that is
permanently assigned to the modem.
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