Sierra Wireless DART 200 CDPD Modem - Manual (Page 21)

DART 200 CDPD Modem User’s Guide 1 Introduction
PN1197-00 Revision 1.0 1-3
Contacting your cellular carrier
There are currently two cellular carriers in each market area: the A side
carrier and the B side carrier. Each carrier can potentially install and
enable CDPD on their cellular network. The CDPD network allows
end-users to visit the regions of other carriers, as well as move within
their home cellular system.
Contact your cellular provider to get an IP Address for your modem.
This IP address lets you operate the modem on the CDPD network.
Although the modem can perform some basic functions without an IP
Address, it cannot register, ping, or run end-user applications. Your
carrier requires the Equipment Identifier (EID) of the DART 200 to give
you an IP Address.
Ask your carrier for the following information:
• Side of their operation (A or B)
• IP Address
• IP Address of a router or server to ping when you are testing
CDPD network overview
The CDPD system is an extensive communications system overlaying
the existing cellular voice network, as shown in Figure 1-2. It takes
advantage of the investments already made by cellular providers. By
adding CDPD to the network, packet data can be interspersed with voice
communications at an advantageous cost to the end-user.
Figure 1-2. CDPD network
MAS/
CDPD
Modem MDBS MDIS
Public or Private
Packet Data Networks
F-ES
Host
System
Cellular Tower
M-ES
The communication flow sequence includes:
1. Data packets transmitted from the Mobile End Station (M-ES) are
received at the cellular towers by Mobile Data Base Stations
(MDBSs)
2. Data packets are passed by the MDBS to the controlling Mobile Data
Intermediate System (MDIS)
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NOTE:
The EID is found on
the label on the bottom
of your DART 200.