Agilent Technologies E1439 User Manual page 57

Raw
The Raw fiber mode transmits raw (i.e., unprocessed, full bandwidth) ADC data over the fiber
interface. At the same time that the raw data is transmitted over the fiber interface, filtered ADC
data can be sent over the local bus (Agilent E1439D only) or read from the FIFO via the VME
bus. After selecting Raw, optical data transmission starts at the trigger event and is not affected by
trigger delays or data delays. The raw data transmission continues even after the measurement is
complete. Changing the fiber mode stops data transmission. See the following illustration.
Fiber Interface Setup
Fiber Mode
Rate
BOF
CRC
Flow Control
Epoch Generate
Epoch Size
Note
Setting the data port to Fiber while in the Raw fiber mode results in an invalid instrument state
because raw and filtered data cannot both be sent over the fiber interface at the same time.
E1438D / E1439D
Fiber RX
DIGITAL
ADC
FILTERS
Raw
1
106 or 250 MBs
Optional
2
ON
Optional
Optional
Divisible by 4
1. Only with external sam-
ple. Internal sample gen-
erates data too fast for
this rate.
2. Some receivers may
require CRC to be off
for compatibility
1 KB
Fiber TX
FIFO
FIFO
VME BUS
LBUS
Using the Agilent E1439
Fiber Optic Interface
47