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Audio i/o cards, Card power and fuses, Introduction – Grass Valley NV5128 v.2.5 User Manual

Page 32

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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

This manual is related to the following products: