Motorola XPR 5550 用户手册

NOTE: You cannot manually add or delete an entry to the 

roam list. Check with your dealer or system 
administrator for more information.

Capacity Plus is a single-site trunking configuration of the 
MOTOTRBO radio system, which uses a pool of channels to 
support hundreds of users and up to 254 Groups. This feature 
allows your radio to efficiently utilize the available number of 
programmed channels while in Repeater Mode.

Icons of features not applicable to Capacity Plus are not 
available in the menu. You hear a negative indicator tone if you 
try to access a feature not applicable to Capacity Plus via a 
programmable button press.

Your radio also has features that are available in conventional 
digital mode, IP Site Connect, Capacity Plus and Linked 
Capacity Plus. However, the minor differences in the way each 
feature works does NOT affect the performance of your radio.

Check with your dealer or system administrator for more 
information on this configuration.

Linked Capacity Plus is a multi-site multi-channel trunking 
configuration of the MOTOTRBO radio system, combining the 
best of both Capacity Plus and IP Site Connect configurations.

Linked Capacity Plus allows your radio to extend trunking 
communication beyond the reach of a single site, by connecting 
to different available sites which are connected via an Internet 
Protocol (IP) network. It also provides an increase in capacity by 
efficiently utilizing the combined available number of 
programmed channels supported by each of the available sites. 

When the radio moves out of range from one site and into the 
range of another, it connects to the new site's repeater to send 
or receive calls/data transmissions. Depending on your settings, 
this is done automatically or manually.

If the radio is set to do this automatically, it scans through all 
available sites when the signal from the current site is weak or 
when the radio is unable to detect any signal from the current 
site. It then locks on to the repeater with the strongest Received 
Signal Strength Indicator (RSSI) value.

In a manual site search, the radio searches for the next site in 
the roam list that is currently in range (but which may not have 
the strongest signal) and locks on to it.

Any channel with Linked Capacity Plus enabled can be added 
to a particular roam list. The radio searches these channels 
during the automatic roam operation to locate the best site.