TDT RZ2 Manual page 148

3-16
Status Indicators
Cyc:
Ovr:
Bus%:
I/O%:
Important! The status lights will flash (~3 times a second) to alert the user when a device
goes over the cycle usage limit, even if only for a particular cycle. This helps to
identify periodic overages caused by components in time slices.
Fiber Optic Port ‐ Optional
The RX6 can include a single fiber optic port most often used with the HTI3, but
may also be used to acquire digitized signals from a Medusa preamplifier over a
fiber optic cable. This provides loss-less signal acquisition between the amplifier and
the base station. The port can input up to 16 channels at a maximum sampling rate
of ~25 kHz. See "Fiber Oversampling", below for more information. The fiber optic
port can be used with any of the Medusa preamplifiers including the RA16PA,
RA4PA, or RA8GA. The channel numbers for each port begin at a fixed offset
regardless of the number of channels available on the connected device.
Channels are numbered as follows:
Amp-A
Fiber Oversampling
The fiber optic cable that carries the signals to the fiber optic input ports has a
transfer rate limitation of 6.25 Mbits/s. With 16 channels of data and 16 bits per
sample, this limitation translates to a maximum sample rate of 24.414 kHz.
However, the need may arise to run a circuit at a higher sample rate while still
acquiring data via a fiber optic port. The fiber optic port on the RX6 can oversample
the digitized signals that have already been sampled up to 4X or ~100 kHz. This
will allow an RX6 to run a DSP chain at ~50 kHz or ~100 kHz, and still sample
data acquired through an optically connected preamplifier that digitized the incoming
data stream at a maximum rate of ~25 kHz.
Oversampling is performed on the base station. The signals being acquired will still
be sampled at ~25 kHz on the preamplifier. This means that, even with
oversampling, signals acquired by an optically connected preamplifier are still governed
by the bandwidth and frequency response of the preamplifier.
Amp Status and Clip Warning Lights
If the RX6 includes a fiber optic port for a Medusa Preamplifier, an Amp light is
located to the right of the fiber optic port. This light is used to indicate the power
status or provide a clip warning for the connected amplifier.
When an amplifier is not connected the Amp light will flash in a slow steady pattern.
The light is lit when the amplifier is connected and begins to flash quickly when the
voltage on the battery for the corresponding amplifier is low. When any channel on
the connected amplifier produces a voltage approaching the maximum input of the
amplifier, the corresponding light will flash rapidly to warn that clipping may occur if
RX6 Multifunction Processor
cycle usage
processor cycle overages
percentage of internal device's bus capacity used
percentage of data transfer capacity used
1 - 16
System 3