Grass Valley 8972PX User Manual

8972PX

HD/SD/ASI PROTECTION SWITCH

Instruction Manual

Software Version 1.1.1

071858002

DECEMBER 2009

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8972PX

HD/SD/ASI PROTECTION SWITCH

Instruction Manual

Software Version 1.1.1

071858002

DECEMBER 2009

Contacting Grass Valley

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4 8972PX — Instruction Manual

Contents

Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

8972PX HD/SD/DVB ASI Protection Switch Module . . . . . . . . . . . . . . . . . . . . 9

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Configuration Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Manual Switching Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

GPI Program Output Controls and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . 13

Web Page Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Newton Control Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

SNMP Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Front Edge Pushbutton Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Autonomous Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Signal Health Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Switching Summary Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Next State Program/Backup Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Protect Switch Summary Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Passive Bypass Only Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Module Placement in the GeckoFlex Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Module Installation Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Rear Module Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Front Module Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Determining Maximum Cable Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Primary Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Secondary Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Alternate Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Relay-Protected Program Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Program Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Outputs 1.1 and 1.2, Outputs 2.1 and 2.2, Outputs 3.1 and 3.2 . . . . . . . . . . . . 34

GPI I/O Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Operation Indicator LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Local/Remote Jumper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Module Configuration and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

8900NET Module Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Newton Control Panel Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Web Browser Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Status Web Page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

I/O Config Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

System Config Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

8972PX — Instruction Manual 5

Contents

HD/SD Criteria Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

DVB/ASI Criteria Web Page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Output Control Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

User Settings Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Slot Config Web Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Software Updating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Status Monitoring Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

External Frame Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

LED Reporting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Web Browser Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

GPI Interface Status Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

SNMP Reporting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Power-up Diagnostics Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Electronic Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Module Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Contacting Grass Valley . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Warnings and Alarm Summary Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Appendix — SNMP Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Using Additional SNMP Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Appendix — Configuration Summary Table . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

6 8972PX — Instruction Manual

Preface

About This Manual

This manual describes the features of the 8972PX module and the corre­sponding rear module in the 8900 GeckoFlex frame. As part of this family
of modular products, it is subject to the Safety and Regulatory Compliance
information described in the GeckoFlex Frames 8900FX/FF/FFN Signal Pro
cessing System Instruction Manual.

All Modular product manuals can be found on-line in PDF format at this
link:

www.grassvalley.com/docs/modular

-

8972PX — Instruction Manual 7

Preface

8 8972PX — Instruction Manual

8972PX HD/SD/DVB ASI Protection Switch Module

Introduction

This manual covers installation, configuration, and operation of the 8972PX
HD/SD/DVB ASI Protection Switch module for the GeckoFlex frame.

The 8972PX module is a signal protection switch designed to maintain a
continuous Program video output. Two relay-protected input signals,
called the Primary and the Secondary, are part of a changeover switch that
continuously feeds the Program Output with a good signal. In addition, an
Alternate input signal (not relay-protected) can be enabled to provide
another backup candidate signal if desired. The module accepts HD/SD­SDI, or DVB ASI video signals.

The switching of the input signal to maintain a continuous protected
Program Output can be manually controlled by the user with various
manual switching controls, including an external GPI interface. The
module can also be set in user configuration to switch autonomously by the
module according to the status of defined signal criteria. When switching
is controlled autonomously by the module, it will automatically switch the
Program Output to the next valid backup candidate depending on whether
the user favors to maintain the Primary input or maintain stability of the
Program Output signal.

The module can maintain the Program Output even in the event of a power
failure or when the front module is completely removed from the frame.
This is done by the presence of relay-controlled passive bypass circuitry on
the rear module that latches the relay-protected Primary or Secondary
input signal to the Relay-Protected Program Output BNC.

The 8972PX can be used in play-out and transmission applications where
switching between main and redundant paths is required. Another useful
application is for switching between alternate inputs (Please Stand By
apology slides for example) when the primary and secondary have both
failed.

8972PX — Instruction Manual 9

System Requirements

The main features of this module are summarized below:

• Two module set including a hot-swappable front and dual rear module.

• Two relay-protected changeover input signals, the Primary and the Sec­ondary, continuously feed a relay-protected Program output,

• An Alternate input is also available as a backup candidate.

• Passive Bypass Only mode to maintain signal path in the event of
power failure and for maintenance purposes.

• Eight outputs, including:

• One main relay-protected output with passive bypass feature.

• One electronic output that follows the main input.

• Three output pairs that can be user-configured to follow one of five

choices: Program, Backup Candidate, Primary Input, Secondary
Input, or Alternate Input inputs.

• Manual switching controls including a GPI interface, web pages,
Newton Control Panel, front edge pushbuttons, and SNMP commands,

• An Autonomous mode that can be set in module configuration to
switch the input to the Program Output based on signal health status

Good or Not Good) of the HD, SD or DVB ASI signal inputs.

(

• Module configuration can be done with the web pages or using the
Newton Control Panel.

• Autonomous module control can be overridden by using any manual
switching control.

• SNMP health monitoring is supported through the 8900NET module
with applications such as NetCentral.

• Software updating using NetConfig or an microSD card.

System Requirements

8972PX module operation requires the presence of an 8900NET Network
Interface module in a GeckoFlex frame running software version 4.2.0 or
later for configuration. The latest version is recommended. Check the soft
ware version of your 8900NET (Net Card) Network Interface module by
navigating to the Frame Status web page (see
example) and noting the software version given below the frame graphic.

-

Figure 17 on page 45 for an

The latest 8900NET module software as of this printing is version 4.3.0 and
can be downloaded free of charge directly from the Grass Valley ftp site at
this location:

ftp://ftp.grassvalley.com/modular/8900/8900net/

10 8972PX — Instruction Manual

Configuration Summary

This section of the manual gives a summary of the available switching
strategies, how they are configured, and how the module can be manually
controlled by the user.

The input selection to the Program Output can be switched using manual
switching controls at any time by the user or set to switch automatically by
the module’s own autonomous switching strategy mechanism based on the
signal health status of the Primary, Secondary, and (if enabled for use in
autonomous mode), the Alternate input, as determined by the module.

The manual switching controls include the GPI interface, the web page con­trols, the Newton Control Panel, the hardware pushbutton switches on the
front edge of the module circuit board, and the SNMP commands. Refer to

Manual Switching Controls on page 13 for a complete overview of the

manual switching controls.

When the module is set to operate in an autonomous mode (under control
of the module), the type of switching is selected in configuration as one of
two switching strategies:

Configuration Summary

• Maintain Stability – using this strategy, the autonomous control favors

stability on the Program Output and it keeps either the Primary or Sec­ondary input as the Program output as long as their signals remain
good.

• Maintain Primary – using this strategy, the autonomous control favors

maintaining the Primary input as the Program Output. If the module
has detected the Primary as not good, it switches to the Secondary. The
module switches back to the Primary input whenever the Primary is
detected as good. The amount of time before the Primary switches back
after being detected as good (Switchback Delay) can be set by the user.

For an overview of the Autonomous mode of operation, refer to Autono-

mous Mode on page 16.

The current Program Output set by the module while in Autonomous
mode can be overridden at any time by the user with a manual switching
control. When this occurs, the switching mode of the module changes to

Manual. To put the module back into the Autonomous switching mode

(Maintain Primary or Maintain Stability), the user must configure this
setting using the remote controls (Output Control web page, the Newton
Control Panel, or the SNMP get/set commands).

8972PX — Instruction Manual 11

Configuration Summary

Release all four
GPI lines

Web, Newton Panel,
SNMP autonomous
mode controls

Web, Newton Panel,
SNMP, pushbutton
switch commands

Web, Newton Panel,
SNMP, pushbutton
switch commands

Activate any
GPI line

Activate any
GPI line

Manual mode (GPI Only)

Manual mode

Autonomous mode

An understanding of the switching override priorities can be helpful in
using the 8972PX module. As shown in

Figure 1, the GPI interface will have

highest priority over other manual switching controls and the autonomous
control modes.

Activating the GPI interface by making contact closure with the Switch to
Primary, Switch to Secondary, or Switch to Alternate GPI lines will force the
Program Output to the selected choice. When this GPI line is de-activated,
the module is left in Manual mode and the Program Output can be
switched using any of the manual switching controls or the module can be
set to Autonomous mode using the Output Control web page, the Newton
Control Panel, or the SNMP get/set controls.

Note When the GPI Exclusive Control is activated by contact closure, only the GPI

switch controls (Switch to Primary, Switch to Secondary, or Switch to Alter­nate) can be used to change the input choice to the Program Output, leaving
the module in Manual mode. Once all GPI closures are de-activated, the
module can be controlled using any manual switch controls or be configured
for autonomous control.

Figure 1. Switching Control Priorities

12 8972PX — Instruction Manual

Manual Switching Controls

GPI I/O

Rear Module

GPI I/O Connection

External

GPI Interface

Switch to Primary

Primary is Active

Primary Not Good

Secondary is Active

Alternate is Active

Secondary Not Good

Alternate Not Good

Switch to Secondary

Switch to Alternate

GPI Exclusive Control

Receives Primary, Secondary,

and Alternate status

from Front module

and sends switching

commands to front module

through rear module

GPI I/O connector

8580_03r2

The following manual switching controls are described in detail in this sec­tion:

• GPI Program Output Control and Monitoring

• Web Page Control (page 14)

• Newton Control Panel (page 14)

• SNMP Get/Set Commands (page 14)

• Front Edge Pushbutton Controls (page 15)

GPI Program Output Controls and Monitoring

The Program Output selection can be controlled through the SubD-25 GPI
I/O connection mounted on the rear module when wired to an external
customer-supplied GPI control device. Switching is activated by contact
closure. The GPI controls work directly on the front module to select the
Program Output. Primary, Secondary, and Alternate input signal status can
also be reported to the GPI interface through tally connections.

Configuration Summary

The four switching control lines from the customer-supplied device and the
six input status reporting lines from the front module are shown in

Figure 2.

Figure 2. GPI Interface

8972PX — Instruction Manual 13

Configuration Summary

When the GPI Exclusive Control line is activated by contact closure, only
the Switch to Primary, Switch to Secondary, or Switch to Alternate GPI
control lines can be used to change the designated input selection (by
contact closure). The Program Output selection will be under control of the
GPI Switch commands until the GPI Exclusive Control is de-activated
leaving the module in Manual mode. At this point, the user may use
another manual switching control to change the input to the Program
Output or set the module to an Autonomous switching strategy.

It is not necessary to activate the GPI Exclusive Control to drive the module
with a GPI control. Any one of the three GPI controls (Switch to Primary,
Switch to Secondary, or Switch to Alternate) can be activated indepen
dently by contact closure forcing the Program Output to the designated
input. This also switches the module to Manual mode. The selection of the
Program Output will remain under GPI control only as long as one of these
three GPI controls is activated (by a contact closure).

While the Program Output selection is under GPI control, the web pages
will display a message stating

Figure 27 on page 64). Once GPI control is removed (no contact closure

(see
on any of the four GPI controls), the module is in Manual mode. The user
can then control the module with any of the manual switching controls (see

Manual Switching Controls on page 13) or set the module to an Autonomous

switch mode (Maintain Primary or Maintain Stability).

The GPI is controlling the Program Output Selection

-

Web Page Control

The Program Output can be forced manually using the Output Control web

page 62) by selecting the Force Primary, Force Secondary, or Force Alternate

page (
buttons in the Program Output Selection section,. This will change the
Switching Strategy Switch mode to the
page.

Newton Control Panel

The Newton Control Panel command PrgOutput allows manual selection of
the Primary, Secondary, or Alternate output and forces the Program output
to this selection. For a summary of all Newton Control Panel parameters,
refer to the

Summary of 8972PX Configuration Functions on page 83.

SNMP Commands

In addition to the standard 8900 module SNMP monitoring reporting, the
8972PX module allows two get/set commands to manually manage the
input selection (Input Select) and module mode of operation (Switchback
Strategy) through the SNMP interface. Refer to

Commands on page 80 for details.

Manual radio button on this web

Using Additional SNMP

14 8972PX — Instruction Manual

Front Edge Pushbutton Controls

Force Alternate button

Force Secondary button

Force Primary button

On the back of the front edge of the module circuit board (Figure 3) are
three pushbuttons labeled Prim (S1), Sec (3), and Alt (S4) that will manually
force the Program output to Primary, Secondary, or Alternate when acti
vated. Hold the button for at least 3 seconds for the change to take effect.

Figure 3. Front Edge Controls Manual Force Buttons

Configuration Summary

-

8972PX — Instruction Manual 15

Configuration Summary

Autonomous Mode

When the module Switching Strategy is set for an autonomous mode, the
module automatically determines signal status based on enabled signal
health criteria as interpreted by the module for the three video inputs, Pri
mary, Secondary, and Alternate (when selected for usage in Autonomous
mode on the System Config web page). Refer to the block diagram in

Figure 4 on page 19 for an overview of the Autonomous mode.

There are two switching strategies in the Autonomous mode: Maintain Sta­bility and Maintain Primary. One of these must be selected as the Switch
Mode for use in the Autonomous mode using one of the remote controls
(Output Control web page, Newton Control Panel, or SNMP get/set com
mands).

• Maintain Stability Mode – in situations where signal stability on the

program Output is most important, select this mode. When the Primary
has failed and has switched to the Secondary, it will stay on the selected
Secondary until forced back to the Primary manually or the Secondary
fails. This mode provides the least amount of signal interruption (the
most signal stability).

-

-

•

Maintain Primary Mode – in situations where it is favored to have the

Primary input active as much as possible, select this mode. When the
Primary has failed and has switched to the backup candidate, when the
Primary has recovered, the module automatically returns the Primary
to the Program Output. The switchback to the Primary can be set to a
delay to allow the restored signal to establish itself after recovery. The
amount of Program Switchback Delay is set by the user on the Output
Control web page or using the Newton Control Panel.

Signal Health Criteria

Signal health status for the three input signals is determined by certain cri­teria analyzed by the module. The 8972PX handles HD/SD SDI video
signals or DVB ASI signals and uses different criteria to determine signal
health status. The status of the module inputs (when
the I/O Config web page for each input signal) is given on every web page
in the header area at the top of the page and also reported on the Newton
Control Panel and can be read from the GPI interface.

The input format to the module can be selected as Auto allowing all of the
signal standards in the Input Standard Selection pulldown (on the

Config Web Page on page 55) to be considered valid by the module for any

input. If only a single standard is selected as the input format, only that
standard will be considered valid for any input to the module.

Reporting is enabled on

System

16 8972PX — Instruction Manual

Configuration Summary

HD/SD Criteria

When the input signal is HD or SD SDI video, the signal health status is
based on the following criteria as analyzed by the module. These criteria
are always enabled and the module will determine module health by
checking each item below.

The signal is considered Good when:

• Carrier Detect – a valid carrier is detected on the input,

• Serial Lock – the serial receiver is locked to a SMPTE compliant data
stream,

• Valid Format – the input signal matches the selected input selection,

• SMPTE Presence – no instability has been detected for a valid format,
and

• No SMPTE TRS Errors – no TRS (Timing Reference Signal) errors have
been detected.

If any one of these criteria are incorrect for the input type selected, the
signal will be reported as
occur depending on the Switching Strategy Switch Mode selected in con
figuration:

Not Good. When this happens, the following cases

-

• If the Switchback Strategy Switch Mode is set for Maintain Primary, the
module will switch the Program Output immediately to the Backup
Candidate. It will return the Primary input to the Program Output as
soon as the Primary input becomes good again in the time set with the
Switchback Delay control on the Output Control web page or with the
Newton Control Panel.

• If the Switchback Strategy Switch Mode is set for
the Primary input is detected as
Program Output immediately to the next valid Backup Candidate and
remain there until the user decides to manually override the selection
to return the Primary input to the Program output or the Backup Can­didate fails.

An optional criteria category to check for EDH/CRC errors can be enabled
by checking the EDH/CRC

The error detection process is done independently on each input channel
for both SMPTE
total of fields allowed before the signal is considered not good) can be
selected with the controls provided.

292M and SMPTE 259M. The error threshold (number and

Enable checkbox.

Not Good, the module will switch the

Maintain Stability, when

8972PX — Instruction Manual 17

Configuration Summary

DVB ASI Criteria

When the input signal is DVB ASI, the signal health status is based on the
criteria described below as determined by the module. These criteria are
always enabled and the module will determine module health by checking
each item below.

The signal is considered Good when:

• Carrier Detect – a valid carrier is detected on the input,

• Serial Lock – the serial receiver is locked to a DVB ASI compliant data
stream,

• Valid Format – the input signal matches the selected input selection,
and

• MPEG2 TS Lock – the input signal is locked to the synchronization byte
of the MPEG packets.

If any one of the criteria are incorrect for the input type selected, the signal
will be reported as
the same as the HD/SD SDI video signals explained in

page 17.

Not Good. Switchback Strategy Switch Mode selection is

HD/SD Criteria on

On each input link, the bit rate of packets is evaluated on up to 4 user­defined PIDs (the minimum bit rate detected is one packet per second or

kbps). A PID is seen as not present as soon as there is no packet within

1.5

one second. It is recommended to choose PIDs whose bit rate is at least 4.5
kbps to avoid an unexpected switch of the input if packets are not evenly
spaced on the transport stream. Primary and Secondary inputs share the
same PIDs. The Alternate input can have 4 independent dedicated PIDs.

For setting the PIDs, see DVB/ASI Criteria Web Page on page 60. Presence
and Continuity Error reporting criteria can also be enabled as desired for
each PID stream.

18 8972PX — Instruction Manual

Figure 4. Autonomous Mode Block Diagram

8580_02r1

J10: Secondary
Input

J9: Primary
Input

J3: Output 1.2

J1: Output 1.1

J4: Output 2.2

J2: Output 2.1

J8: Output 3.2

J7: Program Output
Relay Protected
Output

J5: Program Output
Protected Program
Output

J6: Output 3.1

J11: Alternate
Input

Rear Module

Front Module

Programmable Output Pairs

HD/SD or DVB-ASI

Criteria Analysis

HD/SD or DVB-ASI

Criteria Analysis

HD/SD or DVB-ASI

Criteria Analysis

Manual Controls

Switch Manager

Configuration Summary

8972PX — Instruction Manual 19

Configuration Summary

Switching Summary Tables

To aid in understanding the detailed processing behavior in the various
states of the module inputs, a number of switching summary tables are pro
vided in the next section. Use these tables along with the following three
basic rules for autonomous switching of inputs to the Program output to
better understand processing behavior:

1. The module always selects the Primary or Secondary inputs (when

valid) over the Alternate input.

2. In the Maintain Primary autonomous mode, the module always selects

the Primary input when it is valid.

3. In the Maintain Stability autonomous mode, the module always selects

the valid input that reduces the amount of switching. If it switches from
the Primary to the Secondary, it will leave the Secondary as the Program
output until the Secondary fails.

Ta bl e 1 through Tab le 5 present a detailed description of the next Program

output/Backup Candidate state by giving each possible case for the current
state of the Program output and the Backup Candidate using the Primary,
Secondary, and Alternate inputs and other configuration factors.

-

Ta bl e 1 through Tab le 5 include the following:

• Program = Primary/Backup = Secondary Tabl e 1 o n pa ge 22

• Program = Secondary/Backup = Primary Tab le 2 on p age 22

• Program = Alternate/Backup = Primary Table 3 on page 23

• Program = Primary/Backup = Alternate Table 4 on page 23

• Program = Secondary/Backup = Alternate Table 5 on page 24

Ta bl e 6 on page 25 provides a graphical summary of the various states of

the Program Output. Refer to the explanation of this table in Protect Switch

Summary Table on page 24.

20 8972PX — Instruction Manual

Next State Program/Backup Tables

Ta bl e 1 through Tab le 5 are arranged from left to right to with the items

listed below. Abbreviations for the input signals are: Primary (PRI), Sec­ondary (SEC) and Alternate (ALT).

• Current Program – lists the input currently on the Program Output.

• Current Backup – lists the Backup Candidate that will replace the

current input on the Program Output if it fails.

Configuration Summary

• Alternate Enabled – indicates

for use in Autonomous mode and

• Maintain Primary – indicates

Autonomous mode,
mode does not matter.

• Primary Status – the status of the Primary input is

mode does not matter.

• Secondary Status – the status of the Secondary input is

if the mode does not matter.

• Alternate Status – the status of the Alternate is

mode does not matter.

• Action of Program Output/Backup – shows the switch action of the

Program output and the Backup Candidate.

• Next Program/Next Backup Candidate – summarizes what the next

Program output will be and the next Backup Candidate using the input
signal abbreviations.

No if Maintain Stability is enabled, or N/A if the

Yes when the Alternate input is enabled

No when it is not enabled.

Yes if Maintain Primary is enabled as the

Good, Fail, or N/A if the

Good, Fail, or N/A

Good, Fail, or N/A if the

8972PX — Instruction Manual 21

Configuration Summary

Current

Program

PRI SEC No N/A

PRI SEC Yes N/A

Current
Backup

Alternate

Enabled

Table 1. Program = Primary/Backup = Secondary

Maintain

Primary

Primary

Status

Good N/A N/A No Action PRI_SEC

Fail Good N/A Switch_SEC, Switch_PRI SEC_PRI

Fail Fail N/A No Action PRI_SEC

Good Good N/A No Action PRI_SEC

Good Fail Good Stay_PRI, Switch_ALT PRI_ALT

Good Fail Fail No Action PRI_SEC

Fail Good Good Switch_SEC, Switch_ALT SEC_ALT

Fail Good Fail Switch_SEC, Switch_PRI SEC_PRI

Fail Fail Good Switch_ALT, Switch_PRI ALT_PRI

Fail Fail Fail No Action PRI_SEC

Secondary

Status

Alternate

Status

Action of

Program Output/

Backup Candidate

Next Program/

Next Backup

Current

Program

SEC PRI No

SEC PRI Yes

Current
Backup

Alternate

Enabled

Table 2. Program = Secondary/Backup = Primary

Maintain

Primary

No Good

Yes Good N/A N/A Switch_PRI, Switch_SEC PRI_SEC

N/A Fail N/A N/A No Action SEC_PRI

No Good

Yes Good

N/A Fail

Primary

Status

Secondary

Status

Good N/A No Action SEC_PRI

Fail N/A Switch_PRI, Switch_SEC PRI_SEC

Good N/A No Action SEC_PRI

Fail Good Switch_PRI, Switch_ALT PRI_ALT

Fail Fail Switch_PRI, Switch_SEC PRI_SEC

Good N/A Switch_PRI, Switch_SEC PRI_SEC

Fail Good Switch_PRI, Switch_ALT PRI_ALT

Fail Fail Switch_PRI, Switch_SEC PRI_SEC

Good Good Stay_SEC, Switch_ALT SEC_ALT

Good Fail No Action SEC_PRI

Fail Good Switch_ALT, Switch_PRI ALT_PRI

Fail Fail No Action SEC_PRI

Alternate

Status

Action of

Program Output/

Backup Candidate

Next Program/

Next Backup

22 8972PX — Instruction Manual

Table 3. Program = Alternate/Backup = Primary

Current

Program

ALT PRI No N/A

ALT PRI Yes N/A

Current
Backup

Alternate

Enabled

Maintain

Primary

Configuration Summary

Primary

Status

Good N/A N/A Switch_PRI, Switch_SEC PRI_SEC

Fail Good N/A Switch_SEC, Switch_PRI SEC_PRI

Fail Fail N/A Switch_PRI, Switch_SEC PRI_SEC

Good Good N/A Switch_PRI, Switch_SEC PRI_SEC

Good Fail Good Switch_PRI, Switch_ALT PRI_ALT

Good Fail Fail Switch_PRI, Switch_SEC PRI_SEC

Fail Good Good Switch_SEC, Switch_ALT SEC_ALT

Fail Good Fail Switch_SEC, Switch_PRI SEC_PRI

Fail Fail Good No Action ALT_PRI

Fail Fail Fail Switch_PRI, Switch_SEC PRI_SEC

Secondary

Status

Alternate

Status

Action of

Program Output/

Backup Candidate

Next Program/

Next Backup

Table 4. Program = Primary/Backup = Alternate

Current

Program

PRI ALT No N/A

PRI ALT Yes N/A

Current

Backup

Alternate

Enabled

Maintain

Primary

Primary

Status

Good N/A N/A Switch_PRI, Switch_SEC PRI_SEC

Good Good N/A Stay_PRI, Switch_SEC PRI_SEC

Good Fail Good No Action PRI_ALT

Good Fail Fail Stay_PRI, Switch_SEC PRI_SEC

Secondary

Status

Fail Good N/A Switch_SEC, Switch_PRI SEC_PRI

Fail Fail N/A Switch_PRI, Switch_SEC PRI_SEC

Fail Good Good Switch_SEC, Stay_ALT SEC_ALT

Fail Good Fail Switch_SEC, Switch_PRI SEC_PRI

Fail Fail Good Switch_ALT, Switch_PRI ALT_PRI

Fail Fail Fail Stay_PRI, Switch_SEC PRI_SEC

Alternate

Status

Action of

Program Output/

Backup Candidate

Next Program/

Next Backup

8972PX — Instruction Manual 23

Configuration Summary

Current

Program

SEC ALT No

SEC ALT Yes

Current
Backup

Alternate

Enabled

Table 5. Current State SEC_ALT

Maintain

Primary

No Good

Yes Good N/A N/A Switch_PRI, Switch_SEC PRI_SEC

N/A Fail N/A N/A Stay_SEC, Switch_PRI SEC_PRI

No Good

Yes Good

N/A Fail

Primary

Status

Secondary

Status

Good N/A Stay_SEC, Switch_PRI SEC_PRI

Fail N/A Switch_PRI, Switch_SEC PRI_SEC

Good N/A Stay_SEC, Switch_PRI SEC_PRI

Fail Good Switch_PRI, Stay_ALT PRI_ALT

Fail Fail Switch_PRI, Switch_SEC PRI_SEC

Good N/A Switch_PRI, Switch_SEC PRI_SEC

Fail Good Switch_PRI, Stay_ALT PRI_ALT

Fail Fail Switch_PRI, Switch_SEC PRI_SEC

Good Good No Action SEC_ALT

Good Fail Stay_SEC, Switch_PRI SEC_PRI

Fail Good Switch_ALT, Switch_PRI ALT_PRI

Fail Fail Stay_SEC, Switch_PRI SEC_PRI

Alternate

Status

Action of

Program Output/

Backup Candidate

Next Program/

Next Backup

Protect Switch Summary Table

Ta bl e 6 on page 25 gives a graphical representation of the Program output

in the following states:

• Autonomous Mode Primary First (w/o Alternate) – the top graphic
gives the status of the Output (Out) for the most useful/common states
of the Primary (PRI), and Secondary (SEC) inputs, including the Timer
(Switchback Delay), with the Autonomous mode enabled. The Alter­nate is not used in this example.

• Autonomous Mode Primary First (with Alternate) – the second graphic
gives the status of the Output (Out) for the most useful/common states
of the Primary (PRI), Secondary (SEC), and Alternate (ALT) inputs,
including the Timer (Switchback Delay), with the Autonomous mode
enabled.

• Force Switch to Secondary – this graphic illustrates the state of the
output when the Secondary is forced manually to the output. Note that
the Autonomous mode switches to Manual. The Autonomous mode
must be re-enabled using the Output Control web page, The Newton
Control Panel or the SNMP controls.

• Switch to Maintain Primary – this graphic shows the state of the output
when the mode is changed from Manual to Autonomous when the
Primary is good and when the Primary is bad.

24 8972PX — Instruction Manual

Autonomous Mode Primary First (w/o Alternate)

PRI fails

PRI restored

too short PRI restored

PRI Fails

then SEC fails

PRI & SEC Fail

SEC recovers first

PRI OK Fail OK Fail

OK

OK OK Fail Fail OK OK

Fail

Fail

SEC OK OK OK OK

OK

OK OK OK Fail OK OK Fail OK

Timer

Timer

Timer OK Timer OK

Output

PRI SEC

SEC

SEC

PRI PRI

SEC SEC SEC PRI SEC

On On On On On On On

On On

On On On

Autonomous Mode Primary First (with Alternate)

PRI fails

PRI restored

too short

PRI restored

PRI Fails

then SEC fails

PRI & SEC Fail

SEC recovers first

PRI OK Fail OK Fail

OK

OK OK

Fail Fail

OKOK

Fail

Fail

SEC OK OK OK

OK OK

OK

OK OK Fail

OK OK

Fail OK

Timer

Timer Timer OK

Output

PRI SEC SEC SEC SEC PRI SEC PRI SEC

ALT

ALT

Autonomous

Autonomous

Autonomous

Autonomous

On On On On On On

On

On On

On On On

Forced Switch to Secondary

Force to SEC

PRI OK

OK

SEC OK

OK

Output

PRI SEC

PRI

SEC

Output

On Off

Switch to Maintain Primary

PRI is OK PRI is OK

start with PRI start with SEC

PRI is Bad

start with PRI

OK OK OK

OK

Fail Fail

OK

OK OK OK OK OK

PRI

PRI

SEC PRI

PRI

SEC

Off On

Off On Off On

8580_08r0

Table 6. Protect Switch Summary Table

Configuration Summary

8972PX — Instruction Manual 25

Configuration Summary

Passive Bypass Only Mode

The Passive Bypass Only mode has two main purposes as described below:

1. During normal operation, the Bypass mode for the module is set for

Active Processing Enabled on the System Config web page. The module can

be set for
that occurs when power is lost or the front module is removed. The

Passive Bypass Only mode is normally used for maintenance purposes

such as cabling or testing the rear module relay bypass path.

When set for Passive Bypass Only, the module simulates the bypass state
where the Primary and Secondary inputs are switched by relays on the
rear module to the Relay-Protected Program Output at BNC, J7 as
shown in
signals now bypass the front module completely and the Status of the
Primary and Secondary inputs on all web page headers are reported as

Bypassed as shown in the example in (Figure 22 on page 56). As this

mode is only a simulation of removing the front module, putting the
module in this mode does not affect the other controls on the front
module or the Alternate input.

Passive Bypass Only to simulate the relay-protected bypass state

Figure 5 on page 27. The Primary and Secondary input

In this mode, output J7 (Relay-Protected Program Output), remains the
input previously selected (except if it was the Alternate input it will be
switched to the Primary input). When the module is switched back to

Active Processing Enabled on the System Config web page, it returns in

Manual mode with no change to the Program Output.

2. When power is lost to the frame or the front module is completely

removed, the relay-protected Primary and Secondary inputs will
automatically be switched to the rear module relay bypass path and the
input previously selected will be latched to the output at BNC J7, the
Relay-Protected Program Output. The passive bypass path ensures the
continuous transmission of the Primary/Secondary input signal to the
Relay-Protected Program Output. When power is returned to the frame
or the module is reinserted, the module will be in Manual mode with
no change to the Program Output.

26 8972PX — Instruction Manual

Figure 5. Module in Passive Bypass Mode

8580_04r1

GPI I/O

J10: Secondary Input

J9: Primary Input

J7: Program Output
Relay Protected Program Output

Primary and Secondary

signals bypass the

front module

Configuration Summary

8972PX — Instruction Manual 27