GRASS VALLEY 8914 - Manuale utente

8914

DUAL AES/EBU DELAY DISTRIBUTION AMPLIFIER

Instruction Manual

071-0547-01

FIRST PRINTING: JANUARY 1999

REVISED PRINTING: APRIL 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

8914 Instruction Manual iii

Contents

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

8914 Dual AES/EBU Delay Distribution Amplifier

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

Module Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Adjustments, Testpoints, and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Delay Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

48 KHz Input Signal Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

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

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Receive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

FPGA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

FIFO Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Line Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Frequency Lock LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Index

iv 8914 Instruction Manual

Contents

8914 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 8914 Instruction Manual

Preface

8914 Instruction Manual 1

8914 Dual AES/EBU Delay

Distribution Ampliﬁer

Introduction

As the transition to digital video and audio accelerates, there is an

increased need to delay the audio associated with broadcast video. This is

due to the relatively large processing times associated with DVEs and

switchers. The 8914 provides a low cost and easy-to-use solution to the lip

sync errors associated with these large delays. Minimizing space require-

ments, the 8914 provides two fully controllable delay paths on a single

board, allowing up to 20 delays (ten modules) in a two rack unit frame. If

instead of two delays you require more distribution, the ﬁrst channel can

be passively looped to the second channel to produce seven outputs. The

8914 is also a full-featured reclocking distribution ampliﬁer that ﬁts inthe

8900 series frame.

A clock referenced to the applied input reclocks all outputs in each section.

The delay is set using 16-position rotary switches on the front of the

module. There are ﬁne and coarse rotary adjustment switches for each

delay channel.

The 8914 offers the following features:

■

Two full-function delays on a single board,

■

All outputs reclocked to reduce jitter,

■

Up to one half second delay in approximately 2 ms increments,

■

Support of 32, 44.1 and 48 KHz sample rates,

■

Four outputs on channel one, three outputs on channel two,

■

Loop-through input on channel one enables redundant system design,

■

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

and

■

Up to twenty AES/EBU delays in a 2 RU 8900 Frame.

2 8914 Instruction Manual

8914 Dual AES/EBU Delay 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 1.

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) and the error detection. For additional

information concerning the Controller module, refer to the Controller

manual.

Figure 1. 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.

0547-04

Controller

Module

(only)

Any 8900 Module Power

Supplies

(only)

8914 Instruction Manual 3

Module Installation

Cabling

8900 module locations are interchangeable within the frame. The

maximum number of modules the frame will accept is ten. Figure 2 illus-

trates the rear connector plate for an 8900 Series frame.

Figure 2. 8900 Series Frame Rear Connector

Note

At the back of this manual are die-cut overlay cards that can be placed over the

rear connector BNCs to identify the speciﬁc 8914 connector functions.

Inputs

The 8914 Dual AES/EBU Delay DA has two channels. Delay 1 is a 1x4 DA

with a looping input. Delay 2 is a 1x3 DA with a terminated input. Trans-

former coupling on the inputs eliminates common mode noise.

For a delay channel 1 signal, connect an input source to one of the

loopthrough input connectors, J9 or J10 (See Figure 3). Terminate the

unused connector into 75

Ω

. Use J7 for input to delay channel 2. J7 is inter-

nally terminated into 75

Ω

Figure 3. Typical Module Input and Outputs

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

DA1

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

DA3

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

DA5

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

DA2

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

DA7

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

DA9

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

DA4

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

DA6

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

DA8

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

DA10

0547-05

J9 J10

Four Delay 1

Outputs

DAx

0547_03

Loopthrough

Delay 1 Input

Three Delay 2

Outputs

Terminated

Delay 2 Input

4 8914 Instruction Manual

8914 Dual AES/EBU Delay Distribution Ampliﬁer

Outputs

There are four identical outputs for delay channel 1— J2, J4, J6, and J8.

There are three identical outputs for delay channel 2 — J1, J3, and J5. The

destination equipment should have an input impedance of 75

Ω

unless it

has loopthrough inputs, in which case the unused loopthrough connector

must be terminated into 75

Ω

Adjustments, Testpoints, and Indicators

The 8914 DA has ground and +5V testpoints easily accessible on the front

edge of the module (see Figure 4).

Between the testpoints is a green Power On LED.

Each reclocking section is phase-locked to its AES input signal. The Lock

LEDs on the front of the module are on when the reclocking chip has locked

on the incoming AES data stream. There is one Lock LED for each channel

as shown.

Figure 4. 8914 Adjustments, Testpoints, and Indicators

Delay 1

Coarse increments

Delay 1

Fine increments

Delay 2

Coarse increments

Delay 2

Fine increments

Green LED indicates

Phase Lock Channel 2

Green LED indicates

Phase Lock Channel 1

Green LED indicates

Power On

+5V Testpoint

Ground Testpoint

0547_02

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