19 March, 2003
V1615om1.doc/ A
Page 5 of 5
2.4 HARDWARE
The figure below shows diagrammatically the main board of the V1615 along with some components of
interest.
The only setting available to the user is LK 1 which changes the data rate selection from FIXED to
AUTO. As delivered from the factory the unit will be set to FIXED at 270Mbit/s. This is as
recommended. For other data rates move the link to AUTO. In exceptional cases the unit can be FIXED
to other data rates by changing resistors in the frequency setting matrix, but this must be done by
VISTEK.
FR
ON
T PAN
EL
RE
A
R
CONNE
C
T
OR
FS1
LK 1
FIXED
AUTO
Freq.
matrix
The V1615N is built with an identical PCB but there are differences in which components are fitted.
In particular the Link and frequency setting matrix is not fitted. Therefore there are no user settings
on the V1615N.
2.5 ASI SIGNALS
Although the V1615 and V1615N are SDI DAs, they can be used for ASI signals on some outputs.
The main difference is that SDI signals are polarity independent while ASI signals are not. (There
are other technical differences, but this is the critical one which directly affects the signal integrity.)
Four of the outputs have the correct polarity while the other four are inverted. This means that only
the following four outputs can safely be used for ASI signals:
SDI 2
SDI 3
SDI 6
SDI 7
For those applications that require all outputs to be ASI compatible the V1614 and V1614N DAs are
available.
2.6 DART CONTROLS
These units have no control, but do have status indication as follows:
PARAMETER
V1615
V1615N
Input Signal present and locked
✔
Re-clocker fitted (V1615N)
✔
✔
Fixed/Auto Data Rate Mode
✔
Data Rate (as set if fixed, or as detected if AUTO)
✔
