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40 Pelco Manual C543M-A (7/03)
Downframing requires that the Video Inputs of the first bay be connected to the
video circuitry of the bay immediately below it. If you remember the physical layout
of the CM9760-RPC card, you will recall that the 16 video inputs to the card are fed
not only to the large, front loaded Video Input Card but are also wired to an output
connector located near the bottom edge of the card. This connector is cocked at an
angle to the bottom matrix bay rear opening for easy access. A downframe cable is
used to connect the bottom connector of the RPC card to either a DFL (looping)
card or a DFC (non-looping) card.
If you are downframing to only one bay, this bay can be populated with DFL or DFC
cards. You will need as many DFL or DFC cards as there are RPC cards in the first
bay. Figure 30 represents downframing with a 256 x 32 multiple matrix bay
configuration that uses DFL cards in the second bay. In this case, the video circuitry
between the first and second bay are tied together, slot for slot, via their bottom
connectors. The termination jumpers on the DFL card in the second or last bay are
in the terminated position only if the loop outs are not connected; the RPC cards in
the first bay are unterminated. In general, termination jumpers on the last downframed
card in a series must be set to the termination setting; however, since an individual
termination jumper exists for each video line, you can route individual video signals
through the DFL card and loop to a monitor output and terminate at that point if you
wish. As a result of downframing operation just described, the Inputs in the first bay
become available to the downframed bay and any input can now be switched to the
additional 16 monitor outputs created there, increasing the total number of monitor
outputs.
Figure 30. Single Bay Downframe–256 Cameras x 32 Monitors
SLOT POSITIONS
1-16
SLOT POSITIONS
1-16
JUMPER
SLOT
POSITION 17
16
16
(RIBBON CABLE)
32 MONITORS
256 VIDEO IN
BAY 1
BAY 2
J(T)
ONLY TERMINATE
THE INPUTS WHEN
LOOP OUTS ARE
NOT CONNECTED
CARD TYPE
J(NT)