Grass Valley NV5128 v.2.5 - Manual (Page 32)

22 Rev 2.5 • 24 Sep 09
2. Introduction
Active Cards
Audio I/O Cards
Audio input cards and output cards support AES synchronous, AES asynchronous, and analog
audio signals. Each type of signal requires a unique type of card. For example, to support AES syn-
chronous signals, cards that specifically manage AES synchronous signals must be installed. Dif-
ferent types of audio input cards and output cards can be inter-mixed in a single frame to meet
specific switching configuration needs.
For each input card and output card installed, an associated backplane must also be installed. For
more information, see
Backplanes on page 13.
Analog and AES synchronous signals may be converted between analog and digital within the
NV5128 router frame. (See
Mixing Analog and Digital on page 7.) In addition, analog or AES syn-
chronous signals may be routed as stereo or mono signals, but not as AES asynchronous signals.
AES asynchronous signals can only be routed as stereo signals. However, using the SRC input
card, asynchronous AES signals can be converted to synchronous signals and then routed as stereo
or mono signals. (See
AES Sample Rate Converter (Input Only) on page 24.)
The following is a list of the different audio input cards and output cards available. Each card is
listed by the type of signal it manages. For your convenience, the part number for each card has
been included.
For a list of all audio input cards and output cards and their associated backplanes, see Cards, Card
Sets, and Backplanes on page 93.
Card Power and Fuses
Analog audio and AES input cards and output cards receive power from the motherboard. Each
card uses direct current converters (DC/DC) to convert the corresponding backplane’s +48
VDC
into the appropriate regulated supply voltage(s). The combination of pre-regulators and DC/DC
converters and supply voltages varies from card type to card type, depending on the requirements
of the associated circuitry. There is a non-serviceable, self-resetting 1A fuse located on each card.
For more information, see
Fuse Replacement on page 76.
Input Card/Output Card
Inputs and
Outputs Incoming Signals
per Sample Rate Input Card Part
Number Output Card
Part Number
AES synchronous balanced and
unbalanced 16 stereo or 32
mono 16 stereo (32 mono) at
48
kHz
EM0389 EM0390
AES asynchronous balanced
and unbalanced 16 stereo 16 stereo at 32 kHz to
96 kHz (passed
through)
EM0387 EM0388
AES Sample Rate Converter 16 stereo 16 stereo (32 mono) at
22
kHz to 108 kHz
asynchronous,
converted to
synchronous AES
locked to 48 kHz
EM0500
(input only) N/A
Analog 16 stereo or 32
mono 16 stereo (rate N/A) or
32 mono (rate N/A).
Converts analog input to
internal digital format
locked to
48 kHz
EM0585 EM0586