5.2.2
Expansion Slots
The expansion slots are above the CPU on the rear of the en-
closure and allow the addition of a vertical interval sync
expansion board in systems that were originally ordered with-
out one. One slot is used by the CPU board and one can be
used for the sync board. An additional expansion slot is avail-
able for any future upgrades that may occur. For more
information about the Vertical Interval Sync Expansion
board, see section 4.1, “Vertical Interval Sync Expansion
Boards.”
5.2.3
CPU
The CPU is usually located in the top expansion slot. It has
two DB-9 serial ports for linking to other enclosures, receiving
communication from Single Bus Controllers (SBC), and com-
municating with other serial devices, such as a PC.
5.2.4
Rear Main
The rear main contains the voltage selector, the fuse, and the
power connector.
The voltage selector can be set at 110V or 220V. Make sure
the voltage selector of each enclosure is on the correct voltage
setting before applying power.
Each enclosure in the distribution matrix contains a 1 amp
fuse. To release the fuse, turn the fuse covering counterclock-
wise.
Power must be applied to all enclosures in the distribution
matrix. Since there is no power switch on the enclosures, at-
taching the power cord to an outlet turns the distribution
matrix on. It may be helpful to plug each enclosure into a
power strip and then plug the power strip into an outlet.
5.3
I/O Boards
Each 2 rack unit enclosure can contain up to four I/O boards,
3 rack unit enclosures can contain up to six boards, and 4
rack unit enclosures can contain up to eight boards. An enclo-
sure’s boards can be any combination of audio and video.
Each board has two adjustable features, input impedance and
input gain control. Adjust the input impedance using the im-
pedance jumpers.
5-4
Chapter 5
figure 5.2 Rear main
