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What’s the purpose of the switch marked ‘HIGHER DES DECODE’? Well, because we
make all reeway modules the same, in a router bigger than 16x16, you have to ‘tell’
each card what range of sources and destinations it’s assigned to. hat’s the purpose
of this switch. he range is assigned thus:
W 1 W 2 W 3 W 4 ource and destination Range
0 0 x x 1-16
1 0 x x 17-32
0 1 x x 33-48
1 1 x x 49-64
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In traditional television applications a DC restore function is nearly always
appropriate - in order to remove DC sit variations between signals. Without this
function, switching between signals with different C components can cause frame-
roll due to corruption of sync field-block.
However, in other applications of a wideband analogue router, the DC restore
function is definitely not appropriate. hese include the routing of computer-type
RGB graphics signals and medium rate telecoms signals. In these cases a stable DC
path is required.
o cater for all circumstances, reeway provides a user selection of a DC restored
input signal stage, or a DC coupled input stage ( all circuitry downstream is DC
coupled). his is selectable by means of PL9 which may be found in each signal block.
DC COUPLE selection
DC RESTORE selection
DC COUPLE
DC REST
DC COUPLE
DC REST
