Sierra Wireless 555 manual Rev 3.3 May.02 159

	Chapter 14: The Watcher Menu Options
Table 14-3: General Tab Options
Field	Description
System Select	This field allows you to prevent the AirCard
	from roaming or limit roaming to specific
	channels. (The term “roaming” is explained
	on page 18.)
	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 19), 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.

Installation and Use on Handheld/Pocket PCs

Rev 3.3 May.02 159