NVision NV8288, Руководство пользователя

Страница: 28 / 86

18 Rev 1.3 • 21 Oct 08
2. Introduction
Active Cards
Output Card Functions
Output cards process up to 12 incoming signals. The functions of each type of card are described in
the following sections. Outputs cards are organized by category
— filler or standard.
Filler
The NV8288 uses filler output cards. There are two types of filler output cards: one for outgoing
SD-SDI signals (EM0532) and one for outgoing SWB signals (EM0533). Both types of cards
receive 12 inputs from the crosspoint card and contain 12 re-clockers. The re-clocker creates two
copies of the input, feeding one output to a cable driver and one output to a 12×1 MUX. The cable
driver forwards the output to the coaxial connector to distribute outgoing signals. The Mux sends
the output to the motherboard, which in turns forwards the output to the monitor cardset for moni-
toring.
Figure 2-17 shows the flow of a signal through the filler output card. For signal re-clocking rates,
see
Signal Rates and Flow on page 4.
Figure 2-17. Filler Output Card Block Diagram
Standard
The NV8288-Plus uses standard output cards. There are two types of standard output cards: one for
SD signals (EM0540) and one for SWB signals (EM0541). Each card receives 6 inputs from the
top crosspoint card (via the motherboard). The inputs are fed to a 2×1 MUX, which forwards the
input to one of 6 re-clockers. The re-clocker creates two copies of the input, feeding one output to a
cable driver and one output to a 6×1 MUX. The cable driver forwards the output to the coaxial con-
nector to distribute the outgoing signals. The Mux sends the output to the motherboard, which in
turns forwards the signal to the monitor cardset for monitoring.
When two NV8288-Plus routers are connected together, the top crosspoint card distributes 6 sig-
nals as described above, sending one copy to the local coaxial connectors and one copy to the local
monitor cardset. In addition, the bottom crosspoint card on the local router forwards 6 signals to a
cable driver. The cable driver feeds the outputs to the expansion connection for distribution to the
connected router. At the same time, the connected router sends 6 signals to the local router through
the expansion connections. Signals arriving from the connected router through the expansion con-
nections are forwarded to one of 6 cable receivers. The cable receivers forward the signal to the
Standard SD 259M
344M
143, 177, 270, 360, and 540 Mb/s EM0540
Standard SWB 259M
344M
292M
143, 177, 270, 360, and 540 Mb/s;
1.483 and 1.485 Gb/s
EM0541
Input Card Signal Type
Standard
(SMPTE)
Rates Part
Motherboard
(12)
Re-clocker
Cable
Driver
Crosspoint Card
12 x 1 Mux
Coaxial
Connector
(12)
Monitor
Outgoing Signal