GRASS VALLEY PERFORMER, Instruction Manual

Page: 37 / 182

2-5
Installation Overview
Front Panel Bit-Rate Mode Switch
The bit-rate switch on the local control panel allows you to choose
between “forced”, AUTO, or DIRECT modes of matching input/
output bit rates. The electrical length of each operating mode is
listed in the specifications section of Section 1 - Product
Description. The modes are described below.
• “forced” modes include: 143 Mb/s for D2/NTSC; 177 Mb/s for
D2/PAL; 270 Mb/s for D1 (625 and 525); and 360 Mb/s for future
HDTV use. NOTE: Care must be taken when using any of these
modes of operation, the bit rate selected via the front panel switch
must match the input rate(s).
• AUTO mode: provides automatic bit rate selection when input
rates are different. The PERFORMER automatically detects the
input bit rate and switches to the correct rate (i.e. with D1 at Input
1 and D2 at Input 2 user switches from Input 1 to Input 2. The
switcher will automatically switch to the new rate.) NOTE: The
input sources must be locked together and timed.
• DIRECT mode: like the AUTO mode it automatically selects the
input rate and the non-reclocked mode (signal goes directly from
the input to the output without going through the deserializer or
the regenerator circuitry).
STATUS
360Mb
270Mb
177Mb
143Mb
AUTO
DIRECT
V