Grass Valley NV8288 v.1.5 - Manual (Page 14)

4 Rev 1.5 • 24 Sep 09
2. Introduction
Signal Rates and Flow
Frame Cooling
The router has two fan trays housing three fans each. The fans draw cooling air from the front of
the router, through the door, and exhaust it through the rear of the frame. The router must have the
door correctly installed and closed for proper airflow through the chassis.
The fan trays are accessed from the front of the frame: one is located at the top of the chassis and
one at the bottom. There are also removable air filters located on the inside of the door assembly. It
is recommended that you perform regular maintenance on the fan trays and filters. For more infor-
mation, see
Maintenance on page 57.
Signal Rates and Flow
Both the NV8288 and the NV8288-Plus support SD-SDI and HD-SDI signals. The routers can
manage SD-SDI or SWB. The following table lists the SMPTE, re-clocking and pass through rates
for each type of signal.
Signal Flow
The NV8288 and the NV8288-Plus switch incoming signals to designated output connections.
Switching is directed by settings configured in the router control system, which sends commands to
the control card. In turn, the control card directs how switching occurs on the crosspoint card. For a
description of control cards and crosspoint cards, see
Active Cards on page 15.
NV8288
The NV8288 is a standalone router that can manage up to 288 inputs and 576 outputs. Figure 2-1
shows the flow of signals in the NV8288. Both top and bottom crosspoint cards receive all incom-
ing signals, up to 288 inputs. The top crosspoint card feeds signals to output cards located in the
upper half of the router frame: Outputs 1–144 and 145–288. The bottom crosspoint card feeds sig-
nals to output cards located in the bottom half of the router frame: outputs 289–432 and 433–576.
Caution If airflow is impeded, overheating can occur.
Type SMPTE Reclock At Pass Through
Standard Definition
(SD) 259M 143, 177, 270, and 360 Mb/s 10 Mb/s to 540 Mb/s
Standard Definition
(SD)
344M 540 Mb/s 10 Mb/s to 540 Mb/s
Super Wide Band
(
SD and HD combined)
(SD and HD
combined) 143, 177, 270, 360, and 540 Mb/s;
1.483 and 1.485 Gb/s
10 Mb/s to 1.5 Gb/s