Front slots, Introduction – Grass Valley NV5128 v.2.5 User Manual
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Rev 2.5 • 24 Sep 09
2. Introduction
Module Slots and Rear Connectors
An internal motherboard spans the frame and interconnects front and rear modules, and distributes
control signals, timing information, and power. Cards, power supply modules, and the fan tray plug
into the motherboard from the front of the router and backplanes plug into the same motherboard
from the rear. Each input card and output card has a corresponding backplane. For more informa-
tion on each type of card, see
on page 21. For more information on backplanes, see
Front Slots
Figure 2-3, next page, shows the front of the NV5128 with the door removed. In the center of the
router are eight slots designated for input cards. To the right and left of the input slots are four slots
designated for output cards. On the far right, two slots house the primary and secondary control
cards. A fan tray is located at the top of the router chassis.
Viewing the frame from the front, slots are numbered 1 through 16, from left to right. (See
Figure 2-3.)
Each slot supports 16 channels, as follows:
• Slots 1 through 4 (for outputs): Slot 1 switches output channels 1 to 16, slot 2 switches output
channels 17-32, and so on.
• Slots 5 through 12 (for inputs) receives and process inputs 1to 128 respectively, in groups of 16
channels per slot, in ascending order, left to right, viewed from the front of the frame.
• Slots 13 through 16 (for outputs) are similar in function to slots 1 to 4, except that the output
channels are in reverse order. That is, slot 13 switches output channels 113 to 128, slot 14
switches 97 to 112, slot 15 switches 81 to 96 and slot 16 switches 65 to 80. The reverse order of
the output channels in the right-hand side of the frame is intentional; it makes it easier to obtain
equal path lengths on the frame’s motherboard, facilitates analog video timing, and facilitates
the use of Classic SWB card sets and machine control card sets installed in slots 11 to 14 (see