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Chapter 5 157
CDMA Measurements - Screens and Control Fields
Control Fields for CDMA Measurements
Data Source
This field selects where the baseband quadrature spreader gets its
data. This field is removed when the Gen Mode field is set to Noise.
• Zeroes uses a data stream of all 0’s that is not encoded before being
applied to the baseband quadrature spreader and output.
• Ext uses external data from the DATA IN connector. This data is not
encoded before being applied to the baseband quadrature spreader.
• Random uses 300 frames of random, error-free data. (See Data Buff
(below) for Single/Cont, Idle/Send operation.)
• Data Buff uses data previously loaded into the data buffer. You can
load your own data into the buffer over GPIB. This data is encoded
before baseband quadrature spreading. Choosing this selection
displays these additional fields:
—Single/Cont
— Single causes the data stream to be output once when Send is
selected.
— Cont causes the data stream to be repeated continuously when
Send is selected. Changing to single operation while sending
causes the data to be interrupted after the current 20 ms
frame.
—Idle/Send
— Idle indicates that data from the buffer is not being
transmitted. Selecting Idle while sending data interrupts the
data at the completion of the current 20 ms frame. A data
stream of all zeroes (encoded) continues to be transmitted after
the initial data stream is interrupted. This is different from
the Zeroes selection above where the data is not encoded.
— Send causes the data stream to be output after two rising
edges of the internal 80 ms clock are detected.
— Start Frame specifies the first frame of data to send.
— # of Frames specifies how many frames of data to send.
Screens on which this field is present
CDMA GENERATOR