GRASS VALLEY 8911 AES-EBU Manuale utente

8911

AES/EBU RECLOCKING DISTRIBUTION AMPLIFIER

Instruction Manual

071-0544-00

FIRST PRINTING: JANUARY 1999

Contacting Grass Valley Group

This document may not be copied, in whole or in part, or otherwise reproduced, except as specifically

permitted under U.S. copyright law, without the prior written consent of Grass Valley Group, P.O. Box

599000, Nevada City, CA 95959-7900 USA. GRASS VALLEY GROUP is a registered trademark and

Grass Valley is a trademark of Grass Valley Group. All registered trademarks and trademarks are prop-

erty of their respective holders. Grass Valley Group products are covered by U.S. and foreign patents,

issued and pending. Product options and specifications subject to change without notice. The informa-

tion in this manual is furnished for informational use only, is subject to change without notice, and

should not be construed as a commitment by Grass Valley Group. Grass Valley Group assumes no re-

sponsibility or liability for any errors or inaccuracies that may appear in this publication.

Region Voice Fax Address Web Site

North America (800) 547-8949

530-478-4148

(530) 478-3347 Grass Valley Group

P.O. Box 599000

Nevada City, CA 95959-7900

USA

www.grassvalleygroup.com

Paciﬁc Operations +852-2585-6688

Support: 852-2585-6579

+852-2802-2996

U.K., Europe, Asia, Middle East +44 1753 218 777 +44 1753 218 757

France +33 1 45 29 73 00

Germany +49 221 1791 234 +49 221 1791 235

8911 Instruction Manual iii

Contents

Preface

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

8911 AES/EBU Reclocking Distribution Amplifier

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Input Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Output Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Linear Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Module Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Loopthrough Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Testpoints and Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Index

iv 8911 Instruction Manual

Contents

8911 Instruction Manual v

Preface

About This Manual

This manual describes the features of a speciﬁc module of the 8900 Series

Distribution Ampliﬁer family. As part of this module family, it is subject to

Safety and Regulatory Compliance described in the 8900 Series frame and

power supply documentation (see the

8900 Series User’s Guide

vi 8911 Instruction Manual

Preface

8911 Instruction Manual 1

8911 AES/EBU Reclocking

Distribution Ampliﬁer

Introduction

The 8911 module is a digital audio 1x8 distribution ampliﬁer that provides

reclocking of the digital signal. The amount of digital audio is ever

increasing as studios and broadcast facilities transition to digital transmis-

sion. The 8911 offers a low cost method of reclocking AES/EBU digital

audio signals. Reclocking reduces the signal jitter resulting from numerous

passes through other equipment such as audio routers and switchers. The

8911 ﬁts into the 8900 series frames which offer passive loop-through

inputs, high density and a wide range of distribution and format conver-

sion functions.

The 8900 Series product line is a family of serial digital distribution ampli-

ﬁers (DAs) and signal processors that reside in a 2 rack unit frame which

accommodates up to ten modules. A variety of modules are available that

can provide fanout, timing/reclocking, monitoring, or error detection and

handling capabilities. Modules are selected by the user to suit their partic-

ular requirements.

The 8911 distribution ampliﬁer provides:

■

Signal reclocking to reduce jitter,

■

Support of 32, 44.1 and 48 KHz sample rates,

■

Eight outputs for ample distribution,

■

Loop-through input enabling redundant system design,

■

Accepts input cable lengths of up to 1000m (Belden 8281 or equivalent),

and

■

Ten module capacity in a 2 rack unit 8900 frame.

2 8911 Instruction Manual

8911 AES/EBU Reclocking Distribution Ampliﬁer

Functional Description

The 8911 has one loop-through, high impedance input and produces eight

75-Ohm outputs. The AES/EBU data is reclocked by means of a phase-

locked-loop. Refer to Figure 1 while reading the following description.

Figure 1. 8911 AES/EBU Reclocking DA Block Diagram

Input Section

The input channel is loop-through and is not terminated (the differential

input is high impedance). The input signal comes from the 50-pin con-

nector, P1, and feeds a transformer, T1. Transformer coupling on the input

eliminates common mode noise. The output side of the transformer feeds

the differential line receiver of AES/EBU receiver U3.

The AES/EBU receiver reclocks the data for its AES/EBU data stream. The

mode pins 17, 18, 23 and 24 are set to pass the entire AES3 signal with the

preamble. The receiver has an incoming audio sample frequency range of

25 KHz to 55 KHz.

Output Section

After it is reclocked, the serial data is routed to a quad EIA-485 line driver,

U4. The line driver chip drives eight output lines.

Phase

Locked

Loop

Input Section

AES/EBU Receiver

Output Section U4

Differential

Line Rx

Output

Line Driver

Output

Line Driver

AES

Outputs

0544_00

Reclocker

Loop-through

AES Input

Lock LED

8911 Instruction Manual 3

Speciﬁcations

The outputs feed a resistive network that performs three functions:

■

Attenuates the signal to become 1 volt peak-to-peak,

■

Creates a 75

Ω

output resistance matching the cable impedance, and

■

Limits the rise and fall times to meet the AES/EBU speciﬁcation.

Linear Regulator

The voltage regulator is a monolithic integrated circuit with a ﬁxed voltage

output of +5 volts. This regulator employs internal current limiting and

thermal shutdown.

Speciﬁcations

Table 1. 8911 Speciﬁcations

Parameter Value

Input

Number 1 loopthrough

Signal type AES/EBU digital audio, per AES3id:1995 and SMPTE 276M

Connector 75

Ω

BNC

Return loss >25 dB, 0.1 to 6 MHz

Outputs

Number 8 reclocked

Signal type AES/EBU digital audio, per AES3id:1995 and SMPTE 276M

Connector 75

Ω

BNC

Return loss >25 dB, 0.1 to 6 MHz

Performance

Sample Rates 48KHz, 44.1KHz, and 32KHz (Automatic selection)

Environmental

Operating temperature range 0 to 45° C, noncondensing

Non-operating temperature range -10 to +70° C, noncondensing

Power Requirements

Supply Voltage +12 Volts

Power dissipation 3 Watts

Physical

Frame Resides in standard 2 rack unit 8900 Series frame

4 8911 Instruction Manual

8911 AES/EBU Reclocking Distribution Ampliﬁer

Module Installation

There are ten cell locations in the frame to accommodate either analog or

digital modules. These are the left ten slots. Refer to Figure 2.

The two cells on the right are allocated for the power supplies. For addi-

tional information concerning the Power Supply module, refer to the

Power Supply manual.

The third cell from the right is allocated for the Controller module. This

module provides the interface for the forced air cover, as well as the SMPTE

269M fault reporting (health alarm). For additional information concerning

the Controller module, refer to the Controller manual.

Figure 2. 8900 Series Frame

To install a module into the frame, follow these steps:

Insert the module into the frame, connector end ﬁrst, with component

side of the module facing to the right and ejector tab to the top.

Verify that the module connector seats properly against the backplane.

Press the ejector tab in to seat the module in place.

Controller

Module

(only)

Any 8900 Module Power

Supplies

(only)

0515_04

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