Service manual

QuadMADI (ESP) (SUN820-204, A204, B204 and C204)
CARD DESCRIPTION
MADI Interfaces : The board provides four MADI/TAXI ports. Each port can be configured as
TAXI format to run with AMS Neve equipment such as an IOS or MTI rack unit. It can also be
configured as MADI format to interface with any other MADI equipment such as multitrack
tape machines. It is a full implementation of MADI with user bits and channel status.
Delay RAM : The SUN820-204 and SUN820B204 have a total of 20 seconds delay RAM
(10 seconds on Rx and 10 seconds on Tx). The SUN820A204 and SUN820C204 have a
total of 5 seconds delay RAM. This delay RAM can be allocated freely among the maximum
256 channels which can pass through the card. The maximum delay of a channel is
allocated at boot up but the actual delay can be varied from 0 to maximum delay using a
control knob on the console.
Metering : The SUN820A204 has 2 metering processors on board which allow all the I/O to
be metered.
Dithering: All boards have the ability to dither the outputs. The dither options are
Rectangular, Triangular, LSB rounding or none with the option to dither to 16, 18, 20 or 24
bit converter length. The type and length can be selected on a channel by channel basis and
is set up in the I/O Designer page.
The QuadMADI also generates the master timing in the SPS thus enabling the ESPs to run.
Signal Presence
Each TX and RX Channel can be monitored for signal presence i.e. whether the signal level is
above four different levels. These levels are peak (highest level), red, orange and green
(lowest level).
These levels are software programmable, which can detect signal levels down to -96dB.
Digital Service Manual
Issue 3 Page 18