Sierra Wireless AirCard 555 User Manual
Page 152
AirCard 555 Network Card User Guide
150
2130142
System Select
This field allows you to prevent the AirCard
from roaming or limit roaming to specific
channels. (The term “roaming” is explained
CDMA networks use designated radio
frequency channels. In every cellular
market, the channels are divided into two
sets: the A side channels and the B side
channels. CDMA network carriers (or
service providers) are assigned either the A
side or the B side channels in each market
by the regulatory agencies that oversee
radio transmissions.
The options in this field are:
•
Home Only—prevents the AirCard
from roaming
•
Automatic—allows the AirCard to
roam on networks of “preferred”
service providers.
•
Automatic A—allows the AirCard to
roam on networks of “preferred”
service providers as well as “non-
preferred” A side service providers.
•
Automatic B—allows the AirCard to
roam on networks of “preferred”
service providers as well as “non-
preferred” B side service providers.
Based on the SID (System Identifier)
assigned to your account during activation
(see page 21), the default in this field is
either Automatic A or Automatic B. It is
recommended that you leave the default,
unless you are advised to change this field
by technical support.
Table 14-3: General Tab Options
Field
Description