Page 1
8936
AUTO RECLOCKING DA MODULE
Instruction Manual
071811000
FIRST PRINTING: MARCH 1996
REVISED PRINTING: APRIL 2001
Page 2
Contacting Grass Valley Group
Region Voice Fax Address Web Site
North America (800) 547-8949
530-478-4148
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Support: 852-2585-6579
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
Copyright © Grass Valley Group. All rights reserved.
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 property 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 information 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 responsibility or liability for any errors or inaccuracies that may appear in this publication.
(530) 478-3347 Grass Valley Group
+852-2802-2996
P.O. Box 599000
Nevada City, CA 95959-7900
USA
www.grassvalleygroup.com
Page 3
Contents
Preface
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
8936 Auto Reclocking DA
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Frame Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Module Placement in the 8900 Frame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Loop-through Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Module Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Automatic Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SMPTE Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Module Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Module Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Alignment Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
EQ Warning Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Index
8936 Instruction Manual iii
Page 4
Contents
iv 8936 Instruction Manual
Page 5
Preface
About This Manual
This manual describes the features of a specific module of the 8900 Series
Modular Products 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
Instruction Manual
8900TX/8900TF/8900TFN Frames
).
8936 Instruction Manual v
Page 6
Preface
vi 8936 Instruction Manual
Page 7
8936 Auto Reclocking DA
Introduction
The 8900 Series product line is a family of serial digital distribution amplifiers (DA). It consists of a 2 RU frame which holds up to ten modules. A
variety of modules are available that can provide fanout, reclocking, monitoring, or error detection and handling capabilities. Modules are selected
by the user to suit their particular requirements.
The 8936 Auto Reclocking DA module is a one input, eight output, auto
reclocking, auto cable equalizing DA. It operates with SMPTE 259M or EBU
Tech 3267 video formats.
The 8936 automatically selects the proper format from the incoming signal
and displays it via an LED at the front of the module. If no signal is present,
no LED will illuminate. If automatic selection is not desired, the user may
use a DIP switch to specify the desired signal format.
The module has auto-equalization for up to 300 meters of Belden 8281 (or
equivalent). There is an equalizer warning LED to indicate when the equalizer is approaching maximum capacity.
The 8936 module provides:
Loop-through input
■
■
Eight outputs
■
Reclocked output
Auto or manual format selection
■
Auto-equalization
■
■
Meets SMPTE 259M or EBU Tech 3267 standard
■
Health monitoring
Input signal present monitoring
■
Input signal monitoring (EQ warning)
■
■
Power supply monitoring
8936 Instruction Manual 1
Page 8
8936 Auto Reclocking DA
Installation
Frame Capacity
Installation of the 8936 module is a process of:
Placing the module in the selected frame slot, and
■
■
Cabling and terminating signal ports.
The 8936 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.
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 8936 in each frame type.
Table 1. Power, Cooling, and Module Capacity of 8900 Frames
Capacity Calculated
Power (W) 60 60 100 100 100
Recommended Module Cooling (W) 30 60 30 90 90
8936 Modules 8 10 8 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.
8900T2
Frame
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 addi-
tional 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 Network
Interface module. These modules provide health bus monitoring and
control options.
8900T2-F
Frame
8900TX
Frame
8900TF
Frame
8900TFN
Frame
2 8936 Instruction Manual
Page 9
Frame Monitor or
Network Interace Module
Any 8900 Module
Power
Supplies
(only)
8036-03
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
1
J2
J4
J6
J8
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
3
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
5
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
2
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
7
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
9
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
4
J2
J4
J6
J8
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
6
J2
J4
J6
J8
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
8
J2
J4
J6
J8
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
10
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
8036-03
1.
3.
Installation
Figure 1. 8900 Series Frame
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
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.
2.
Verify that the module connector seats properly against the backplane.
Press the ejector tab in to seat the module in place.
8936 Instruction Manual 3
Page 10
8936 Auto Reclocking DA
Cabling
Loop-through Input
Refer to Figure 3 when cabling your 8936 module. This illustration shows the
typical input and outputs for an 8900 Series module.
Connect an input source to one of the loopthrough input connectors, J9 or
J10.
Outputs
Digital output
Digital output
Digital output
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).
This loopthrough input must be terminated. The recommended termination for serial digital signals is CANARE BCP-TA (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 8936 module, J1 through J8. The destination
equipment should have an input impedance of 75 Ω unless it has
loopthrough inputs, in which case the loopthrough inputs must be terminated into 75 Ω .
Figure 3. 8936 Input and Output Connectors
J3
DAx
O
U
T
J2
J4
J2J1
J4
Digital output
Digital output
Digital output
J6
J8
J6
Digital output
J8
8110-02
Digital output
Loop-through
Video Input
J5
J7
J9 J10
IN
4 8936 Instruction Manual
Page 11
Module Configuration
When installing the 8936 module, there is an eight position DIP switch (S1)
that must be checked and/or set.
DIP switch S1 determines if automatic or manual data rate selection mode
is desired. It also determines if the EQ warning alarm and video present
alarm will be indicated on the health alarm line. Refer to Figure 4 for the
location of S1 and the possible settings.
Figure 4. S1 Settings
87654321
Module Configuration
8936
S1
8110-09
Refer to Table 2 for the functions and descriptions of S1 settings.
Table 2. DIP Switch S1 Functions
S1 Switch # Function Description
1 – 4 Auto data rate selection All up puts module in automatic data rate selection mode
1 143 Mb When down, 143 Mb data rate is selected
2 177 Mb When down, 177 Mb data rate is selected
3 270 Mb When down, 270 Mb data rate is selected
4 360 Mb When down, 360 Mb data rate is selected
5 EQ Warning When down, EQ Warning Alarm is deacitvated (Off)
6 Video Present When down, Video Present Alarm is deacitvated (Off)
7 – 8 Not Used
Automatic Mode
In the automatic mode, the type of signal present is indicated by one of four
signal present LEDs. If there is not a signal present, no LEDs will illuminate. Refer to Figure 4 for the switch settings for the automatic mode.
Manual Mode
In the manual mode, the module will stay in the mode selected. The signal
present LEDs will only illuminate if that particular signal is present. Refer
to Figure 4 on page 5 for the switch settings for the manual mode.
Note
For S1-1 through S1-4, only one signal selection switch can be turned on at
a time for proper operation.
8936 Instruction Manual 5
Page 12
8936 Auto Reclocking DA
SMPTE Alarm
Note
Refer to Table 3 for the SMPTE alarm functions activated by the 8936.
Table 3. SMPTE Alarm
No + 5V, +12V, or –12V Full alarm
No video (if enabled) Pulsing alarm
EQ warning (if enabled) Pulsing alarm
Module Front View
The front edge of the 8936 module is shown in Figure 5.
Figure 5. 8936 Front View
Card Ejector
The SMPTE alarm can function only if the Controller module is installed.
Function Alarm
+ 12 V
+ 5V
GND
143 Mb
177 Mb
270 Mb
360 Mb
–12 V
EQ WARNING
8110-06
6 8936 Instruction Manual
Page 13
Module Alignment
This section discusses Alignment Equipment and EQ Warning Adjustment.
Alignment Equipment
The 8936 module is fully aligned at the factory and normally requires no
adjustment in the field. If adjustments are necessary, they should be
attempted only by qualified technicians using, at a minimum, the following equipment (or equivalents):
■
■
■
3.
4.
Module Alignment
270 Mb/s serial digital video test signal source with pathological test
signal
Textronix WFM601 Waveform Monitor (or equivalent)
300 meters Belden 8281 cable (or equivalent)
EQ Warning Adjustment
A variable resistor (R36) allows the user to adjust the corresponding cable
length at which the EQ warning LED illuminates.
When R36 is turned counterclockwise, the EQ warning LED will turn on at
shorter cable lengths. The EQ warning LED comes on at longer cable
lengths when R36 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 unused
input with a 75Ω termination.
2.
Turn R36 clockwise until it stops. Refer to Figure 6 for the location of
R36.
Connect a 270 Mb/s serial digital video signal to the selected cable.
Verify that a signal is present.
Turn R36 counterclockwise slowly until the EQ warning LED just turns
on. The module is now set.
Figure 6. R36 Location
8936
R36
8936 Instruction Manual 7
8110-07
Page 14
8936 Auto Reclocking DA
Specifications
Table 4. 8936 Specifications
Parameter Value
Input
Type One 75 Ω loop-through
Signal type SMPTE 259M (A, B, C, and D) or EBU Tech 3267
Input signal monitoring LED is illuminated when the input signal has equivalent loss of 310 meters of
Impedance High impedance
Return loss > 15 dB to 270 MHz
Connector type BNC
Maximum input cable length 300 meters at 143 Mb/s, 177 Mb/s, 270 Mb/s
Signal selection Automatic or manual
Outputs
Output quantity Eight
Signal type Reclocked SMPTE 259M (A, B, C, and D) or EBU Tech 3267
Impedance 75 Ω
Return loss >15 dB (up to 360 MHz)
Signal amplitude 800 mV ±10% when terminated in 75 Ω
Output DC 0 V (AC coupled)
Connector type BNC
Electrical length 10.5 ±1 ns
Module
Power consumption < 3.5 Watts
Temperature range 0–50 ° C Ambient
Power supply monitoring Alerts SMPTE 269M fault reporting (health alarm) when the + 5V power supply
LEDs Four signal present
DIP switch Automatic or manual data rate selection
Setup adjustments EQ warning cable length
8281 cable (or equivalent) at 360 Mb/s
200 meters at 360 Mb/s of 8281 cable (or equivalent)
voltage falls below 4.3V, +12V fails, or –12V fails
One EQ warning
Disables EQ warning to health alarm
Disables video present to health alarm
8 8936 Instruction Manual
Page 15
Service
TP3541-05
8936 AUTO RECLOCKING DA
TP1 +12V
TP2 +5V
TP4 GND
TP8 –12V
143 Mb
EQ
WARNING
177 Mb
270 Mb
360 Mb
TP7 270 DET
TP6 143 DET
TP5 GND
TP3 PCLK
S1
8110-05
Service
The 8936 Auto Reclocking DA modules make extensive use of surfacemount technology and programmed parts to achieve compact size and
adherence to demanding technical specifications. Circuit modules should
not be serviced in the field.
If your module is not operating correctly, proceed as follows:
■
Check input signals
■
Check cables and connections
Check switch positions on the module
■
■
Verify that source equipment is operating correctly
■
Check output connections
Refer to Figure 7 for test points and LEDs that are located on the 8936
module.
Figure 7. Test Point, LED, and Switch 1 Locations
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.
Refer to Contacting Grass Valley Group at the front of this document for the
Grass Valley Customer Service Information number.
For switch settings, refer to the Installation on page 2 of this manual.
8936 Instruction Manual 9
Page 16
8936 Auto Reclocking DA
Functional Description
Refer to the simplified block diagram in Figure 8 while reading the following functional description.
Figure 8. 8936 Simplified Block Diagram
Input
AFC
Adjustment
Cable
Equalizer
EQ Warning
(Adjustment)
Input Signal
Monitoring
Deserializer
10
TRS
Detection
DIP
Switch
5V Switching
Regulator
2
Output
Drivers
Parallel Clock
Frequency
Detection
PLD
Logic
Power Supply
Monitoring
8
4
Outputs
Format &Signal
Present LEDs
Health Monitor
EQ Warning LED
The Cable Equalizer block automatically equalizes the input signal to compensate for cable loss up to 300 meters of 8281 cable (or equivalent) operating at
270 Mb/s. The signal goes to the Input Signal Monitor block which lights
an LED when the EQ circuit reaches its limits of equalization (310 meters of
8281 cable operating at 270 Mb/s).
The Cable Equalizer block also feeds the Deserializer that contains a phase
lock loop which locks to the frequency of the incoming signal. The input
signal is then reclocked to the clock generated by the phase lock loop. The
Deserializer also deserializes the incoming signal to form a ten-bit parallel
data stream and a parallel data clock. The parallel data clock has a frequency equal to one tenth of the incoming signal rate.
An Output Driver then amplifies and distributes the reclocked serial digital
video signal to eight BNC outputs.
10 8936 Instruction Manual
8110-01
Page 17
Functional Description
The Parallel Clock Frequency Detection block detects the rate of the signals
coming from the parallel clock signal. This information is then fed to the
PLD (Programmable Logic Device) block.
A ten-bit parallel stream from the Deserializer is fed to the TRS (Timing
Reference Signal) Detection block. The output of the TRS detector switches
to a logic high for one parallel clock period whenever the TRS is detected.
It then feeds a one shot which holds the TRS pulse for a duration of 14 TRS
pulses. If 15 consecutive TRS pulses are not detected, the output will go to
a logic zero.
The PLD Logic block controls the mode selection (automatic or manual). It
also controls the health alarm outputs and the signal present indicator
LEDs.
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 Controller module be
installed in the frame.
8936 Instruction Manual 11
Page 18
8936 Auto Reclocking DA
12 8936 Instruction Manual
Page 19
Index
A
6
alarm
alignment, module
automatic data rate selection mode
7
5
B
backplane
3
C
cabling
configuration
connectors
controller module
4
5
3
2
D
data rate selection mode
DIP switch, setting to select data rate selection
mode
5
5
E
L
loop-through
4
M
manual data rate selection mode
module
alignment
controller
functional description
installation
power supply
service
slots
7
2
10
2
2
9
3
O
outputs
4, 8
specification
8
P
performance
power supply
8
2
5
EQ warning adjustment
7
S
F
frame
2
frame capacity
functional description
2
service
SMPTE alarm 6
specifications 8
10
9
I
8
input
specification
8936 Instruction Manual Index-1
8
Page 20
Index-2 8936 Instruction Manual
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