Miranda NV8256-Plus, User Manual

Page: 26 / 88

16 Rev 1.3 • 29 Mar 09
2. Introduction
Active Cards
SWB, 3Gig or analog. For your convenience, the part number for each card has been included. For
a detailed description of a card’s function, see
Input Card Functions on page 16.
Status Reporting
All input cards feature a circuit that performs status reporting and drives the card’s functions. Two
LEDs on the front of the input card indicate the card’s status: alarm (Red), power good (Green).
Three additional LEDs situated further back on the card indicate if software is loaded (Amber), if
there is good communication with the control card (Green) or bad communication with the control
card (Red). For more information, see
Indicator LEDs on page 58.
Input Card Functions
Input cards process up to 16 incoming signals. The functions of each type of card are described in
the following sections. Inputs cards are organized by category
— standard, filler or analog-to-SD.
Standard Input Cards
A standard input card manages either SD (
EM0449)
, SWB (
EM0437)
or 3Gig (
EM0619)
incoming
signals from local coaxial connectors and from expansion connectors when two routers are con-
nected together.
Each card receives 16 signals from the local coaxial connectors. Each of the 16 inputs is forwarded
to one of 16 cable equalizers. The equalizers equalize the signal and distribute three copies of the
signal. One copy is sent to a buffer and then the motherboard, which forwards the signal to the cros-
spoint card in the
left slot (inputs 1–256). The second copy is sent to a cable driver and then the
motherboard, which forwards the signal to the expansion connectors. When two routers are con-
nected together, the expansion connectors feed local signals to the second router. The third copy is
sent to a 2×1 MUX which selects a signal to send to the motherboard, which forwards the signal to
the crosspoint card in the
middle slot (redundant crosspoint). For more information on each cross-
point card and crosspoint card slot functions, see Crosspoint Cards on page 18.
If two routers are connected together, the standard input card also receives 16 inputs from the
expansion connections. Each input is forwarded to one of 16 cable receivers, which create two cop-
Input Card
Category
Signal Type
Standard
(SMPTE)
Rates Part Number
Standard SD 259M
344M < 546 Mb/s EM0449
Standard SWB 259M
344M
292M
≤
1.5
Gb/s
EM0437
Filler SWB 259M
344M
292M
≤
1.5 Gb/s EM0437-50
Standard 3Gig 259M
292M
424M
≤
3.0
Gb/s
EM0619
Filler 3Gig 259M
292M
424M
≤
3.0
Gb/s
EM0619-50
Analog-to-SD Input: PAL or NTSC analog composite video
Converted to: SMPTE 259M-C, (4:2:2),
270 Mb/s
EM0451