Nevion AES-VMUX User Manual

AES-VMUX/-SFP

User Manual

Revision: G

2014-07-10

Contents

1 Nevion Support 4

2 Revision History 5

3 Product Overview 6

3.1 Summary 6

4 Introduction 8

4.1 The Nevion SDTI audio concept 9

4.1.1 HW 1.1 enhancements 10

4.2 Top view 10

5 Specifications 11

5.1 Electrical SDTI 11

5.2 Optical SDTI 11

5.3 AES 11

5.4 Latencies 11

5.4.1 Slave modules 12

5.4.2 Clock master module 12

5.4.3 Audio latency 12

5.5 Power 12

5.6 Input wander and jitter tolerance 13

6 Configuration 14

6.1 Clock Master 14

6.1.1 SW2.6 Clock Master mode 15

6.2 Audio port direction 15

6.3 Port addresses 16

6.3.1 Input addresses 17

6.3.2 Output addresses 17

6.3.3 System address planning 18

6.4 Method 18

6.5 Examples 18

6.5.1 Example 1 19

6.5.2 Example 2 21

6.5.3 Example 3 22

6.6 SDTI input control 23

6.6.1 SW2.4 Manual/Auto 23

6.6.2 SW2.5 Optical/Electrical 23

6.7 DIP configuration mode 23

6.7.1 SW2.8 DIP config mode switch. 23

6.8 Multicon control 24

6.9 Status Monitoring 24

7 Connections 25

8 LEDs 29

8.1 Status LED 29

8.2 SDTI Input LED 29

8.3 EDH LED 29

8.4 Optical option LED 30

9 FLP4 commands 31

9.1 ablk 31

9.2 ceq 31

9.3 misc 31

9.4 mtx 32

9.5 pin and lsr 32

9.6 pwr 32

9.7 vmon 32

9.8 On-site re-programming. 33

10 General environmental requirements 34

11 Product Warranty 35

A Materials declaration and recycling information 36

A.1 Materials declaration 36

A.2 Recycling information 37

Nevion Support 4

1 Nevion Support

Nevion Europe Nevion USA

Nevion Europe

P.O. Box 1020 3204

Sandefjord, Norway

Nevion USA

1600 Emerson Avenue Oxnard,

CA 93033, USA

Support phone 1:
[phone]

Support phone 2: [phone]

Outside North America: [phone]

Toll free North

America: [phone]

E-mail: [e-mail]
See http://www.nevion.com/support/ for service hours for customer support globally.

AES-VMUX/-SFP User Manual Rev. G

Revision History 5

2 Revision History

Revision Date Comments

G 2014-06-24 Added example key figure and extra text on example figures. HW 1.1 features listed. Input

switch control added.

F 2013-11-15 Corrected AES-VMUX-C1 figure. Added cable length specification. Added AES-VMUX-SFP

E 2013-11-04 Added Materials decaration and support info

D 2013-06-02 TMLified

C 2013-03-11 First public release

B 2012-08-29 Manual configuration replaces autoconfiguration

A 2012-07-10 First revision

AES-VMUX/-SFP User Manual Rev. G

Product Overview 6

3 Product Overview

3.1 Summary

• Digital audio mass transport

• Asynchronous audio

• Phase correct audio clock recovery

• Predictable signal latency

• 16 AES ports per module, configurable direction

• Up to 64 AES channels per SDTI stream

• De-multiplexing from any timeslot.

• Loopable multiplex for distributed routing

AES-VMUX/-SFP User Manual Rev. G

• EDH for connection monitoring

• Optical SDTI options on SFP

Product Overview 7

AES-VMUX/-SFP User Manual Rev. G

Introduction 8

4 Introduction

The AES-VMUX is used to transport a large number of digital audio signals. The module is both
a multiplexer and demultiplexer and has 16 AES audio ports which may be used as inputs or
outputs. The module forms the core of a highly flexible audio transport and routing concept.

The audio transport has a fixed embedding and de-embedding delay of 64us. The audio signals
are transported completely asynchronously and bit transparently. The clock and phase informa­tion of each AES signal is transported along with the data and the signal is re-constructed at the
demultiplexer end. This keeps all of the AES signals time-aligned through the multiplex and pre­serves the signal phase alignment of multichannel audio.

The module encodes the audio into an SD SDTI video signal and uses the active video space in the
video frame. This allows routing and transport of the multiplex through an established broadcast
infrastructure and inspection with standard test equipment/ waveform viewers.

Modules may be daisy chained to increase the number of AES audio signals in the SDTI signal up
to a maximum of 64 AES channels.

Demultiplexing may be performed on any module from any of the audio signals in the SDTI mul­tiplex. Each demultiplex channel is, in effect, a 64 to 1 AES router.

The module may also be equipped with an SFP providing optical link capability.

Six backplane types are presently available:-

• Double width backplanes

− AES-MUX-C1; All 16 AES ports on female d-sub DB25 and dual optical connectors.

− AES-VMUX-C5; As AES-MUX-C1 but with passive relay loop-through on electrical

SDTI.

• Single width backplanes

− AES-VMUX-C1; 8 AES ports on DB25, DIN 1.0/2.3 SDTI and dual optical connectors.

− AES-VMUX-C4; 8 AES ports on DB25, BNC SDTI and single optical connector.

• Flashcase single width backplanes

− AES-VMUX-C2; 16 AES ports on Molex Male KK, BNC SDTI output only and dual

optical connectors.

− AES-VMUX-C3; 16 AES ports on Molex Male KK, BNC SDTI and single optical con­nector.

SFPs are available for:-

• APD/CWDM Transceiver (18 wavelengths)

AES-VMUX/-SFP User Manual Rev. G

Introduction 9

• PIN/Standard laser tranceiver

The following Nevion video SFPs may be used but only one of the channels will be utilised.

• PIN dual receiver

• APD dual receiver

• Standard short haul dual laser

• CWDM dual laser

The optical input provides an extra input and the actual input may be chosen automatically or
set manually to the required input. In “Auto” mode, the input switches if a suitable signal is not
present, or if the signal disappears. There is no priority, the first input with a valid Nevion SDTI
audio signal is used.

4.1 The Nevion SDTI audio concept

The Nevion SDTI audio uses a normal 625 video frame and data format. This allows simple reuse
of existing legacy infrastructure and standard test and signal monitoring facilities.
The audio is embedded into the active video area on all video lines. An extra ancillary data packet
in the horizontal blanking area identifies the signal as a Flashlink SDTI audio multiplex.

The audio embedding uses two video lines to optimize the number of channels in the multiplex.
Seven stereo audio samples, embedded over two lines gives a maximum sample rate of 54.7 kHz.
This gives a high multiplexing efficiency of normal 48 kHz broadcast audio. The embedding pat­tern repeats over a two frame sequence. The phase reference is only inserted on one of the the two
lines and a frame counter is also embedded into the horizontal ancillary data packet.

The audio is embedded in fixed timeslots placed along the video line. The phase words are embed­ded in a block of video words placed first on every other line followed by seven audio blocks. Each
audio block has 64 audio timeslots. Each timeslot contains a 24 bit audio sample together with the
C, U and V bits from the AES subframe. The frame of AES audio is split between two audio blocks.

The audio multiplex appears on a video monitor as a series of vertical lines or stripes on a video
monitor. Dark green stripes are areas where no audio is embedded. Light green shows that the
channels are embedded but that the AES input is absent. An active audio channel appears as a
multicolored vertical stripe.

The SDI embedded clock is used as a clock reference and the audio is sampled with reference to
the start of the horizontal blanking. The phase measurement (similar to HD audio) is embedded
on the following line. All of the audio channels use the same reference point and all of the phase
measurements are embedded together in a block.

AES-VMUX/-SFP User Manual Rev. G

Introduction 10

4.1.1 HW 1.1 enhancements

Extra VCXO to allow input locking independant of output frequency. This gives the following:-

• Wider input jitter tolerance.

• Master mode module will de-multiplex audio to its AES outputs regardless of loop status.

i.e. System is more resiliant as a module may fail but the remaining chains of modules
still present will still work.

• More stable frequency of SDTI as the output frequency will not change until full lock
is achieved. i.e. Downstream modules will not lose lock when an upstream module is
removed. Performance with the relay backplane is now much improved.

• Wander tolerance of Master mode module is much larger allowing the use of a loop across
video links which are time multiplexed or packetized.

4.2 Top view

AES-VMUX/-SFP User Manual Rev. G

Specifications 11

5 Specifications

5.1 Electrical SDTI

Video standard 576/25i ITU-R BT.656

Error detection EDH according to SMPTE RP165

Input cable length Greater than 250m

All other SDI parameters conform to ITU-R BT.656

5.2 Optical SDTI

Optical range depends on the output power of the transmitter and the sensitivity of the receiver
of the next module.
See Nevion SFP datasheet available from support or the Nevion web site.

5.3 AES

Inputs and outputs according to AES3-2003

Physical interface 110 ohm transformer balanced

Minimum sampling frequency 16.5 kHz

Maximum sampling frequency 54.7 kHz

Double sample rates using AES Single channel double sampling frequency mode is supported. i.e. 96kHz Mono

signal using both sub-frames of the AES signal.

AES Outputs switch off completely if there is no signal in the routed timeslot.

5.4 Latencies

AES-VMUX/-SFP User Manual Rev. G

Specifications 12

5.4.1 Slave modules

HW 1.0 1.1

Video latency 0.56 us 0.85 us

5.4.2 Clock master module

The master module has a buffer which may be up to 2 video lines or 128 us. The actual latency
will depend on the latency due to the round trip which may be large if packetizing transports have
been used or if the stream has been received via satellite. The Clock master module will then add
as little latency as possible to round the total latency up to a multiple of two video lines. Minimum
latency is 128us.

5.4.3 Audio latency

Input to output via a single link

AES 128us / 6.145 audio samples @ 48kHz

Audio Latency will increase by the video latency every time the SDTI signal passes through a
module.

5.5 Power

All AES set to inputs

+5V 0.29 1.5W

All AES set to outputs

+5V 0.67A 3.4W

with SFP

+5V add 1.0 W

AES-VMUX/-SFP User Manual Rev. G