Grass Valley 8941 User Manual

8941

270 MBPS MONITORING DA

Instruction Manual

Software Version 1.4.0

071810902

NOVEMBER 2009

Contacting Grass Valley

International

Support Centers

Local Support

Centers

(available

during normal

business hours)

France

24 x 7

Australia and New Zealand: [phone]
Middle East: [phone] Near

Europe

[phone] or [phone]

Hong Kong, Taiwan, Korea, Macau: [phone] Indian Subcontinent: [phone]

Asia

Southeast Asia/Malaysia: [phone] Southea
China: [phone] Japan: +81

East and Africa: [phone] or [phone]

Belarus, Russia, Tadzikistan, Ukraine,
S. Europe/Italy-Roma: [phone] -Milan: +39
Benelux/Belgium: +32 (0)
Germany, Austria, Eastern Europe: [phone]

Copyright © Grass Valley, Inc. All rights reserved.
This product may be covered by one or more U.S. and foreign patents.

2 334 90 30 Benelux/Netherlands: [phone] N. Europe: [phone]

Grass Valley Web Site

The www.grassvalley.com web site offers the following:

Online User Documentation — Current versions of product catalogs, brochures,

data sheets, ordering guides, planning guides, manuals, and release notes
in .pdf format can be downloaded.

FAQ Database — Solutions to problems and troubleshooting efforts can be

found by searching our Frequently Asked Questions (FAQ) database.

United States/Canada

24 x 7

st Asia/Singapore: [phone]

3 5484 6868

5 Central/South America: [phone]

Uzbekistan: +7 095 25

4 444 UK, Ireland, Israel: [phone]

[phone] or [phone]

80924 225 Switzerland: [phone]

02 48 41 46 58 S. Europe/Spain: [phone]

Software Downloads — Download software updates, drivers, and patches.

2 8941 Product Component Instruction Manual

Contents

Preface

Index

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Frame Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Module Placement in the 8900 Frame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Loop-through Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Module Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

SMPTE Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Module Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Alignment Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

EQ Warning Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Output Gain Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

8941 Instruction Manual 3

Contents

4 8941 Instruction Manual

Preface

About This Manual

This manual describes the features of a specific module of the Gecko 8900
Signal Processing System. As part of this module family, it is subject to
Safety and Regulatory Compliance described in the Gecko 8900 Series
frame and power supply documentation (see the Gecko 8900 Frames Instruc-

tion Manual ).

8941 Instruction Manual 5

Preface

6 8941 Instruction Manual

8941 270 MBPS Monitoring DA

Introduction

The 8941 270 MBPS Monitoring DA module encodes one channel of a serial
digital component video into NTSC or PAL analog composite video. The
selection of output format, NTSC or PAL, is automatic depending on the
input line rate. Four reclocked serial digital video outputs (2 inverting and
2 non-inverting) are also provided.

The module has auto-equalization for up to 300 meters of Belden 8281 (or
equivalent). There is an Equalizer (EQ) warning LED to indicate when the
equalizer is approaching maximum capacity.

The 8941 module provides:

• Loop-through input

• Four analog outputs

•Two inverting reclocked digital outputs

•Two non-inverting reclocked digital outputs

•Auto format selection

•Auto-equalization

•Meets SMPTE 259M or EBU Tech 3267 standard

•Ancillary data detection

•Ancillary audio data detection

•Health monitoring

8941 Instruction Manual 7

Installation

Installation

Frame Capacity

Installation of the 8941 module is a process of:

• Placing the module in the selected frame slot, and

•Cabling and terminating signal ports.

The 8941 module can be plugged in and removed from an 8900 Series frame
with power on. When power is applied to the module, LED indicators
reflect the initialization process (see Power Up on page 11).

The maximum number of 8900 modules allowed in a frame is determined
by frame cooling capacity. Table 1 provides the power capacity, cooling
capacity, and maximum module count for the 8941 in each frame type.

Table 1. Power, Cooling, and Module Capacity of 8900 Frames

Capacity Calculated 8900TX Frame 8900TF Frame 8900TFN Frame

Power (W) 100 100 100
Recommended Module Cooling (W) 30 90 90
8941 Modules 7 10 10

Note

Module capacity figures assume no other modules are in the frame.
If the maximum number of modules a frame can handle is less than ten,
provide as much space between the modules as possible.

Module Placement in the 8900 Frame

There are ten cell locations in the frame to accommodate either analog or
digital modules. These are the left ten locations. Refer to Figure 1.

The two cells on the right are allocated for the power supplies. For addi­tional information concerning the Power Supply module, refer to the 8900
Power Supply manual.

The third cell from the right is allocated for the Frame Monitor or 8900NET
Network Interface module. These modules provide health bus monitoring
and control options.

8 8941 Instruction Manual

0543-03

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

IN

DA1

J2

J4

J6

J8

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

IN

DA3

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

IN

DA5

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

IN

DA2

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

IN

DA7

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

IN

DA9

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

IN

DA4

J2

J4

J6

J8

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

IN

DA6

J2

J4

J6

J8

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

IN

DA8

J2

J4

J6

J8

J1 J2

J3 J4

J5 J6

J7 J8

J9 J10

IN

DA10

O
U

T

O
U

T

O
U
T

O
U
T

O
U

T

O
U
T

O
U

T

O
U

T

O
U

T

O
U

T

1.

2.

3.

Figure 1. 8900 Series Frame

Installation

8208_04r2

Any 8900 Module

Power

Supplies

Frame Monitor or

(only)

8900NET Network

Interface Module

8900 modules are interchangeable within the module cells. There are 10
BNC connectors in each cell’s I/O group. The functional assignment of
each connector in a group is determined by the module that is placed in
that cell. The maximum number of modules an 8900 frame can accept is ten.

Figure 2 illustrates the rear connector plate for an 8900 Series frame.

Figure 2. 8900 Series Frame Rear Connectors

Note

At the back of this manual (hard-copy only) are die-cut overlay cards that can
be placed over the rear connector BNCs to identify the specific 8941 con­nector functions.

To install a module in the frame:

Insert the module, connector end first, with the component side of the
module facing to the right and the 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.

8941 Instruction Manual 9

Installation

Cabling

Cabling to and from the module is done at the back of the Gecko 8900 frame
Refer to Figure 3. At the back of every hard copy 8941 manual are overlay
cards that can be placed over the rear connectors to identify the specific
8941 connector functions.

Loop-through Input

Connect an 270 Mb/s digital input source to one of the loop-through input
connectors, J9 or J10. This loop-through input must be terminated.

The recommended termination for serial digital signals is CONARE
BCP-TA (or equivalent). The destination equipment should have an input
impedance of 75
loop-through inputs must be terminated into 75

Ω unless it has loop-through inputs, in which case the

Ω

.

Outputs

Analog Output

Analog Output

Digital Output Inverted

Note

It is recommended that no more than five digital modules be looped, using
cables less than two meters in length, and with an input cable less than 200
meters of Belden 8281 (or equivalent). Performance of looping inputs to
equipment other than 8900 modules has not been verified; therefore, care
should be taken if this is required.

There are eight outputs for the 8941 module:

•Analog outputs – J1 through J4

• Inverting digital outputs – J5 and J6

•Non-inverting digital outputs – J7 and J8

Figure 3. 8941 Input, Output and GPI Connectors

J3

DAx

O
U

T

J2

J4

J2J1

J4

Analog Output

Analog Output

Digital Output Inverted

J6

J8

J6

Digital Output Non-inverted

J8

8109-02r1

Digital Output Non-inverted

Loop-through

Digital video Input

J5

J7

J9 J10

IN

10 8941 Instruction Manual

Power Up

Power Up

With factory default configuration and a valid input signal connected, one
of the green signal standard LEDs (525 or 625) should illuminate.

The following indicator LEDs are available on the front edge of the module
as shown in Figure 4:

•Video input presence is indicated by the appropriate 525 or 625 LED
(indicating a 525-line or 625-line input signal has been detected).

• The green ANC DATA LED indicates the presence of ancillary data.
This LED is lit for a duration of at least one field if one ancillary data
package is found.

• The green AUDIO DATA LED indicates the presence of ancillary audio
data. This LED is lit for a duration of at least one field if one ancillary
audio data package is found.

• The red EQ WARNING LED is lit when the gain required to equalize
approximately 300 meters of 8281 cable is used.

Figure 4. LEDs and Test Points

Front Edge LEDs

8941 Instruction Manual 11

Module Configuration

Module Configuration

When installing the 8941 module, there is an eight-position DIP switch
(SW1) that must be checked and/or set. Refer to Figure 5 for the location of
SW1 and the possible settings.

Figure 5. SW1 Location and Settings

Switch SW1

Refer to Table 2 for the functions and descriptions of SW1.

Table 2. DIP Switch SW1 Functions

Switch # Function Name Description

S1–1 NTSC SETUP When enabled (DOWN), it determines if active video has set up (with 525 inputs only)

S1–2 INPUT ROUND

S1–3 VID ALARM When enabled (DOWN), module health alarm is activated if no video is present
S1–4 EQ ALARM When enabled (DOWN), module health alarm is activated if an EQ warning condition exists

S1–5 DIAG. MODE

S1–6 CROSS-COLOR REDUCE

S1–7 V BLANK PASS

S1–8 TEST PATTERN

When enabled (DOWN), input video is rounded to eight bits
When disabled (UP), input video is truncated to eight bits
With 8-bit video the last two (potentially noisy) LSBs are set to zero

When enabled (DOWN), the serial port provides module status to a terminal, (usually set to
OFF for normal operation)

When enabled (DOWN), a notch filter near the color burst frequency reduces cross-color
artifacts

When enabled (DOWN), vertical information in the input video is passed
When disabled (UP), vertical information in the input video is blanked by 21 lines for NTSC
and 25 lines for PAL

When enabled (DOWN), a full field color bar test pattern is available if
input video is present

12 8941 Instruction Manual

SMPTE Alarm

Module Alignment

Module Alignment

Note

Refer to Table 3 for the SMPTE alarm functions activated by the 8941.

Table 3. SMPTE Alarm

No + 5V, +12V, or –12V Full alarm
No video (if enabled) Pulsing alarm
EQ warning (if enabled) Pulsing alarm
Missing EAV or SAV Pulsing alarm

This section contains:

•Alignment Equipment

•EQ Warning Adjustment

•Output Gain Adjustment

The SMPTE alarm can function only if the Frame Controller or 8900NET
module is installed in the frame (Figure 1 on page 9).

Function Alarm

Alignment Equipment

The 8941 module is fully aligned at the factory and normally requires no
adjustment in the field. If adjustments are necessary, they should be per­formed only by qualified technicians using, at a minimum, the following
equipment (or equivalents):

• 270 Mb/s serial digital video test signal source with pathological test
signal and EDH

•Tektronix WFM601 Waveform Monitor (or equivalent)

•Analog Waveform Monitor

•NTSC (525): Tektronix 1780 (or equivalent)

•PAL (625): Tektronix 1781 (or equivalent)

• 300 meters Belden 8281 cable (or equivalent)

8941 Instruction Manual 13

Module Alignment

EQ Warning Adjustment

3.

4.

A variable resistor, EQ WARN (R78,) allows the user to adjust the corre­sponding cable length at which the EQ warning LED illuminates.

When R78 is turned counterclockwise, the EQ WARNING LED (Figure 4

on page 11) will turn on at shorter cable lengths. The EQ warning LED

comes on at longer cable lengths when R78 is turned clockwise.

Follow the steps listed to adjust the EQ warning:

Connect a length of cable, approximately 20 meters longer than the

1.

desired length at which the EQ warning LED should turn on, to the
input. The factory default is set for 300 meters. Terminate the

Ω

loop-through input with a 75

2.

Turn R78 clockwise until it stops. Refer to Figure 6 for the location of
R78.

termination.

Connect a 270 Mbps serial digital video signal to the selected cable.
Verify that a signal is present.

Turn R78 counterclockwise slowly until the EQ WARNING LED just
turns on. The module is now set.

Figure 6. EQ Warn,

EQ WARN, R78

R78 Location

14 8941 Instruction Manual

Output Gain Adjustment

OUTPUT GAIN, R20

Follow the steps listed to adjust the output gain:

Connect a window signal to the input; terminated in 75 Ω .

Connect an analog output to the analog waveform monitor; terminated

Ω

in 75

3.

Refer to Figure 7 and adjust OUTPUT GAIN (R20) for:

• 714 mV peak-to-peak for NTSC (blanking to peak white)

.

1.

2.

Module Alignment

Note

• 700 mV peak-to-peak for PAL (blanking to peak white)

Figure 7. Output Gain, R20 Location

In NTSC, adjust for p-p value with or without setup. There will be a slight dif­ference in amplitude (< 2 IRE) when switching between a signal with setup to
one without setup.

8941 Instruction Manual 15

Specifications

Specifications

Table 4. 8941 Specifications

Parameter Value

Video Input

Signal type Serial digital video conforming to SMPTE 259M “Serial digital Interface for

Data type 8- or 10-bit serial video
Impedance 75
Return loss > 18 dB (5 MHz to 270 MHz)
Number of inputs One 75
Connector type BNC

Analog Outputs

Output quantity Four
Signal type Composite analog video conforming to SMPTE 170M for NTSC and CCIR 624

Impedance 75
Return loss > 40 dB to 5 MHz
Isolation > 40 dB to 5 MHz
Connector type 75

Digital Outputs

Output quantity Four: two inverting (J5 and J6), two non-inverting (J7 and J8)
Signal type SMPTE 259M
Impedance 75
Return loss > 15 dB (5 MHz to 270 MHz)
Connector type 75
Electrical length 8.2 ns ± 1 ns

Performance

Frequency response < ± 0.1 dB, 10 KHz to 4.5 MHz
Group delay < 20 ns to 4.8 MHz
Chroma/Luma gain inequality < 3%
Chroma/Luma delay < 10 ns
Signal-to-noise > 60 dB (10 kHz to 5.0 MHz)
K factor (2T) < 0.5%

10-bit 4:2:2 Component and 4 Fsc NTSC Composite Digital Signals”

loop-through

for PAL

BNC

BNC

16 8941 Instruction Manual

Specifications

Table 4. 8941 Specifications - (continued)

Parameter Value

Line tilt < 0.5%
Field tilt < 0.5%
Subcarrier jitter < 0.5°
DC offset < 50 mV
Electrical length (NTSC/PAL 2.275 µs ± 50 ns
V blanking 21 lines NTSC, 25 Lines PAL (all lines passed or blanked)
Picture centering ± 50 ns

Module

Power consumption < 4 Watts
Temperature range 0° to 50° C Ambient
Power supply monitoring Alerts SMPTE 269M fault reporting (health alarm) when the +5 power supply

voltage falls below 4.3, +12V fails, or –12V fails

8941 Instruction Manual 17

Service

Service

The 8941 270 MBPS Monitoring DA modules make extensive use of sur­face-mount technology and programmed parts to achieve compact size
and adherence to demanding technical specifications. Circuit modules
should not be serviced in the field unless directed otherwise by Customer
Service.

If your module is not operating correctly, proceed as follows:

•Check input signals.

•Check cables and connections.

•Check +5 V (TP1)and +3.3 V (TP11) testpoints and fuses, F1 and F2
(Figure 8).

TP11, +3.3V

TP1, +5V

GND

TP4, -12V

•Check switch positions on the module (see

page 12).

•Verify that source equipment is operating correctly.

•Check output connections.

Figure 8. Test Points and LEDs

If the module is still not operating correctly, replace it with a known-good
spare and return the faulty module to a designated Grass Valley repair
depot. Call your Grass Valley representative for depot location.

Module Configuration

Fuses, F1 and F2

1A, 125V

on

Refer to
Valley Customer Service Information number.

18 8941 Instruction Manual

Contacting Grass Valley

at the front of this document for the Grass

Functional Description

Refer to the simplified block diagram in Figure 9 while reading the fol­lowing functional description.

Figure 9. 8941 Simplified Block Diagram

Functional Description

Serial
Input

DIP
Switch

RS-232
Test Rx1

+12V

Max EQ LED

Audio Detect LED
ANC Data Detect LED

Deserializer

Switching

Regulator

10

Video Data

Extraction &

Rounding

8

Microcontroller

Power Supply

Monitoring

Encoder

&

D to A

Digital Video

Output

Analog LPF &

Output Drive

Video Present LEDs

Module
Health

The Deserializer block equalizes and reclocks the input serial digital video
before going to the Digital Video Output. It generates an 27 MHz clock, and
it also monitors how much of the equalizers gain is used.

8109_01

Digital
Video
Outputs

Analog
Video
Outputs

RS-232
Tes t Tx1

Module
Health
Alarm

Parallel D1 from the Deserializer is routed to the Video Data Extraction
block where horizontal and vertical timing information is extracted and
ancillary and audio data is detected. If ancillary data or audio data is
detected, an LED will light.

The Video Data Extraction and Rounding block also provide the clock for
the Microcontroller. It monitors the video for missing EAV (End of Active
Video) or SAV (Start of Active Video) flags. If EAV or SAV are missing, an
error signal is sent to the Microcontroller block. The input video is either
rounded or truncated (at the user’s option) to eight bits before being passed
on to the Encoder.

The Encoder and D to A block separates the color difference components
from the luminance, and then the signals are separately filtered. The result
is added to the luminance component to form the encoded composite
output signal. Externally generated timing of H and V are input from the
Video Data Extraction and Rounding block to synchronize the Encoder.

8941 Instruction Manual 19

Functional Description

In the Analog LPF (Low Pass Filter) and Output block the encoded analog
video passes through the LPF where alias artifacts are removed, and it then
goes to the output driver where the output level is set.

On power up, the Microcontroller performs a check-sum test and then
checks for video. If video is present, the Microcontroller configures the
encoder’s output to the type of video required (PAL or NTSC). The Micro­controller then scans:

•DIP switches

•Changes in fault conditions

•Changes in video status

If any changes are detected, the Microcontroller takes action that requires a
variation in the video standard LEDs, module health line, or in the
encoder’s internal registers.

The 5V Switching Regulator block provides the + 5V for the module.

Power Supply Monitoring is provided to monitor +12V, –12V, and 5V DC
signals. It also alerts the health alarm signal if any voltage drops enough to
cause circuit malfunction.

Note Module health (alarm) monitoring requires that the Frame Controller or

8900NET module be installed in the frame.

20 8941 Instruction Manual

Index

Numerics

525 LED 11
625 LED 11
8900NET module

installation
SMPTE alarm 13

A

analog outputs

cabling

specifications 16
ANC DATA LED 11
AUDIO DATA LED 11

10

B

backplane 9
block diagram 19

C

8

F

factory default 11
FAQ database 2
frame 8
frame capacity 8
Frame Monitor module

installation

SMPTE alarm 13
frequently asked questions 2
functional description 19
fuses 18

8

G

Grass Valley web site 2

I

input 16

cabling 10

specification 16

connectors 9

M

D

digital outputs

cabling
specifications 16

DIP switch (SW1)

settings

documentation online 2

10

12

module

configuration (DIP switch)

installation 8

power supply 8

slots 9
module alignment

EQ Warning

equipment required 13

output gain 15

14

12

E

EQ Warning

adjustment procedure
potentiometer 14

EQ WARNING LED 11

8941 Instruction Manual 21

14

O

online documentation 2
output gain

adjustment procedure

potentiometer 15
outputs 16

15

Index

cabling 10
specification 16

overlay 9, 10

P

performance 16
power supply 8

S

servicing module 18
SMPTE Alarm 13
software download from web 2
specifications 16

T

troubleshooting 18

V

video outputs

cabling

voltage testpoints 18

10

W

web site

documentation
FAQ database 2
Grass Valley 2
software download 2

2

22 8941 Instruction Manual