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Chapter 3, Description of Screens
Call Control Screens
Using the CALL BIT Screen
Using the CALL BIT screen requires expert knowledge of the call processing
messaging protocols used in the system selected in the
System Type field on the
CALL CONTROL screen.
The CALL BIT screen should not be used to change any parameter that can be set
on any other Call Processing Subsystem screen. The contents of the applicable
fields on the CALL CONTROL screen and the CALL CONFIGURE screen are
not updated to reflect any changes made while using the CALL BIT screen. There
is no coupling between the CALL BIT screen and the Test Set.
For example: changing the value of the SAT color code field (SCC) in the forward
control channel mobile station control message (MS IntVCh) does not change the
setting of the
SAT: field on the CALL CONTROL screen.
When using the CALL BIT screen the user is responsible for setting the contents
of all messages used in a messaging protocol. When using the CALL BIT screen,
the Call Processing Subsystem sends the correct messages at the correct times as
defined in the applicable industry standard. Message content is the responsibility
of the user.
When the CALL BIT screen is displayed and the Call Processing Subsystem is in
the connected state, the Test Set constantly monitors the station’s transmitted
carrier power. If the Power falls below 0.0005 Watts, the error message
RF Power
Loss indicates loss of Voice Channel
will be displayed and the Test
Set will terminate the call and return to the active state.
NOTE: In order to ensure that the Test Set makes the correct decisions regarding the presence of the
mobile stations’s RF carrier, the Test Set’s RF power meter should be zeroed before using the
Call Processing Subsystem. Failure to zero the power meter can result in erroneous RF power
measurements.
The field descriptions for each of the messages are given in the "Display Word"
on page 232
.
Reading the CALL BIT Screen Message Fields This section provides
programming information on how to read the contents of individual fields in the
signaling messages available on the
CALL BIT screen.
The syntactical structure for reading the contents of one or more fields from an
individual message is as follows:
General Syntax
CALLP:<message name>:<field name><?>[<;><additional field><?>]