Belden Grass Valley HCO-1822 Instruction Manual

HCO-1822
HD/SD/ASI Change Over with Clean Switch and ALC
Guide to Installation and Operation
M955-9900-101
2015-08-10
.

GUIDE TO INSTALLATION AND OPERATION
HCO-1822
Electromagnetic Compatibility
This equipment has been tested for verification of compliance with FCC Part 15, Subpart B requirements for
Class A digital devices.
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to
part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate
radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own expense.
This equipment has been tested and found to comply with the requirements of the EMC directive
2004/108/CE:
•EN 55022 Class A radiated and conducted emissions
•ENV 50204 Radiated EMF Immunity – RF 900 MHz Pulsed
•EN 61000-3-2 Harmonic current emission limits
•EN 61000-3-3 Voltage fluctuations and flicker limitations
•EN 61000-4-2 Electrostatic discharge immunity
•EN 61000-4-3 Radiated electromagnetic field immunity – radio frequencies
•EN 61000-4-4 Electrical fast transient immunity
•EN 61000-4-5 Surge transient immunity
•EN 61000-4-6 Conducted disturbances immunity
•EN 61000-4-11 Voltage-dips, short-interruption and voltage variation immunity

GUIDE TO INSTALLATION AND OPERATION
HCO-1822
Table of Contents
1HCO-1822 HD/SD/ASI Change Over with Clean Switch and ALC .........................................1
1.1 Introduction ......................................................................................................................................... 1
1.2 Features.............................................................................................................................................. 1
1.3 Block Diagram..................................................................................................................................... 2
1.4 Front Card-edge Interface................................................................................................................... 2
2Installation................................................................................................................................3
2.1 Installation in the Densité frame.......................................................................................................... 3
2.2 Rear Panel Connector ........................................................................................................................ 3
3Operation..................................................................................................................................5
3.1 Control options.................................................................................................................................... 5
3.2 Card-Edge Status LED ....................................................................................................................... 5
3.3 Local control using the Densité frame control panel........................................................................... 6
3.3.1 Overview................................................................................................................................ 6
3.3.2 Menu for local control............................................................................................................. 6
3.4 Remote control using iControl............................................................................................................. 7
3.4.1 The iControl graphic interface window................................................................................... 7
3.4.2 The Switch panel ................................................................................................................... 8
3.4.3 The Alarms panel................................................................................................................. 11
3.4.4 The Timing panel ................................................................................................................. 16
3.4.5 The Operation Mode panel.................................................................................................. 17
3.4.6 The Reference panel ........................................................................................................... 18
3.4.7 The Audio Embed panel ...................................................................................................... 18
3.4.8 The Miranda ALC panel....................................................................................................... 19
3.4.9 The Fingerprint panel........................................................................................................... 22
3.4.10 The RALM panel.................................................................................................................. 23
3.4.11 The Thumbnail panel ........................................................................................................... 25
3.4.12 The Options panel................................................................................................................ 25
3.4.13 The Factory panel................................................................................................................ 27
3.4.14 The Alarm Config panel....................................................................................................... 28
3.4.15 The Info panel...................................................................................................................... 30
3.4.16 User Presets ........................................................................................................................ 32
3.4.17 Profiles ................................................................................................................................. 32
4Specifications.........................................................................................................................35
5Contact Us..............................................................................................................................36
Grass Valley Technical Support................................................................................................................. 36
Corporate Head Office............................................................................................................................... 36
ANNEX – HCO-1822 User Interface.............................................................................................37

GUIDE TO INSTALLATION AND OPERATION
HCO-1822

GUIDE TO INSTALLATION AND OPERATION
HCO-1822 | 1
1 HCO-1822 HD/SD/ASI Change Over with Clean Switch and ALC
1.1 Introduction
The HCO-1822 is a 2x1 HD/SD/ASI change-over which supports 16 channels of embedded audio and Metadata.
Change-overs are performed electronically by the HCO-1822’s internal router. The module can perform a video and
audio “Clean & Silent Switch” between sources using the CS option. In the event of a power failure, the signal is
protected by relays fitted on the rear module, maintaining the integrity of the selected signal at the output. Relays are
fully controllable via the GPI interface.
Input selection can be performed automatically or manually. In automatic mode, the card will perform input selection
based on internal signal analysis with alarm parameters, and the status of the inputs. In manual mode, channel
selection can be undertaken from the Densité Controller, the iControl software, or simply by using a GPI. A GPI can
be connected to an automation system or any simple GPI control panel. The GPI outputs give status of the selected
source allowing tallys to be triggered.
The preview output is user-selectable to follow the main program output or any of the video inputs.
The HCO-1822 generates audio/video fingerprints for each of the different inputs. In combination with other cards
streaming fingerprints for the same signals, an optional module in iControl can measure and report lip-sync errors
through the entire chain of a broadcast facility.
Grass Valley’s new Automatic Loudness Control (ALC) option can eliminate annoying loudness variations between
programs and commercials. Up to 4 programs of 8 channels can be configured to provide independent loudness
control.
The module provides streaming video and audio level metering so an operator can remotely and effectively monitor
the signal path using Grass Valley’s iControl facility monitoring and control system.
The HCO-1822 is a 2RU card that fits a 2-slot rear module. Up to 10 modules can fit in a 2RU densité frame.
.
1.2 Features
•Two source inputs and two outputs: program and preview
•Supports HD (1080i50/59.94, 720p50/59.94), SD (525,625) or ASI input
•Electronic switching with relay back up (on rear module) maintains selected input with power loss
•Automatic mode using internal signal analysis with alarm parameters
•Manual change-over by local frame controller, iControl, iControl Solo or GPI
•Alarm reporting to iControl facility monitoring and control system
•Compatible with iControl end-to-end A/V fingerprint analyzer for lip-sync error detection and measurement
•GPI in & out (IN 1, IN 2, AUTO, BYPASS)
•Optional clean switch function (video and 16 channels of audio)
•Optional on-board Automatic Loudness Control by Grass Valley
•Reference input with passive loop-through
•Two line timing window with CS option
•Thumbnail and audio level meter streaming

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1.3 Block Diagram
The following block diagram shows the functionality of the HCO-1822.
Figure 1.1Functional block diagram HCO-1822
1.4 Front Card-edge Interface
The front card-edge of the HCO-1822 incorporates two elements:
•Status LED (see section 3.2)
•Select Button (see section 3.3)
Figure 1.2 Front card-edge layout
Select
Status
HCO-1822
Status LED
Select Button

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HCO-1822 | 3
2 Installation
2.1 Installation in the Densité frame
The HCO-1822 and its associated rear connector rear panel must be mounted in a DENSITÉ frame. It is not
necessary to switch off the frame’s power when installing or removing the card. See the DENSITÉ Frame manual for
detailed instructions for installing cards and their associated rear panels.
2.2 Rear Panel Connector
The HCO-1822 has multiple inputs and outputs, and making space for all the necessary connectors at the rear of the
frame requires a double-width rear panel.
With the double-width rear panel installed, the HCO-1822 must be installed in the right-most of the two slots covered
by the panel in order to mate with the panel’s connectors.
If it is placed in the wrong slot, the front panel LED will flash red. Move the card to other slot for correct operation. No
damage will result to the card should this occur.
The rear panel connections are as follows:
REF IN – Studio reference input
For external synchronization, connect a black studio reference signal to the BNC labeled REF IN. NB: The loop must
be terminated if not used.
The reference input must conform to SMPTE 170M/SMPTE
318M/ITU 624-4/BUT 470-6 for standard definition signals
and SMPTE 274M / SMPTE 296M for high definition signals
and is used to phase the HD/SD SDI outputs to the studio.
A reference mismatch may occur if there is a difference
between the input video format’s frame rate and the
reference format’s frame rate. When a mismatch occurs, an
input error will be flagged and the card-edge Status LED
will turn red to indicate the mismatch. The table shows the
supported reference signals with respect to the input
signals:
HD/SD IN – serial digital HD/SD input
Connect up to two serial digital video signal, conforming to the SMPTE 292M standard for HD input signals and
SMPTE 259M standard for SD input signals, to the BNC labeled HD/SD SDI IN. DVB-ASI per EN 50083-9 is also
supported. The HCO-1822 will automatically switch to the detected line format.
Supported input signals Reference
525 (SMPTE-259M-C) NTSC (SMPTE-170M)
625 (SMPTE-259M-C) PAL (ITU 624-4)
1080i50 (SMPTE-274M) 1080i50, PAL
1080i59.94 (SMPTE-274M) 1080i59.94, NTSC
720p50 (SMPTE-296M) 720p50, PAL
720p59.94 (SMPTE-296M) 720p59.94, NTSC
ASI (EN50083-9) -------
Figure 2.1HCO-1822-DRP-R Rear Panel

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4| HCO-1822
OUT – serial digital video outputs
The HCO-1822 provides two HD/SD SDI video outputs on BNC connectors, labeled PGM (program) and PVW
(preview). The SDI video signals conform to the SMPTE 292M and SMPTE 259M-C standards.
GPI IN and GPI OUT connectors
The rear panel of the HCO-1822 includes a GPI interface that allows control of the switch process.
When constructing and using an external GPI box, be aware of the following:
1. The HCO-1822 card monitors the external power supply voltage on the GPI input. If the voltage is less than 4V
(per relay datasheet), an alarm will be raised.
2. When a GPI INPUT is triggered while the card is operating in auto mode, the card changes to manual mode and
switches to the input selected by the GPI.
3. DO NOT TRIGGER BOTH GPI INPUTS AT THE SAME TIME OR ALLOW THE TRIGGER PULSES TO
OVERLAP, AS DAMAGE TO THE RELAY MAY RESULT.
4. A GPI trigger pulse should have a duration of at least 40 ms.
Figure 2.2 GPI trigger pulse timing
Using the GPI interface
•Trigger the GPI-IN-1 or GPI-IN-2 pin to select that input.
•Trigger the AUTO-IN or BYPASS-IN pin to select that mode
•Read the GPI-OUT-1 and GPI-OUT-2 pins to identify which
output is selected
•Read the AUTO-OUT and BYPASS-OUT pins to determine
whether either of these modes is in operation.
The four GPI connectors are laid out as shown:
Figure 2.3 GPI Connectors
WECO
connector Pin number GPI direction GPI name
P1
1
IN
GPI-IN-1
2
GND
3
IN
GPI-IN-2
P3
1
IN
AUTO-IN
2
External +5V
3
IN
BYPASS-IN
P4
1
OUT
GPI-OUT-1
2
GND
3
OUT
GPI-OUT-2
P5
1
OUT
AUTO-OUT
2
GND
3
OUT
BYPASS-OUT
GPI IN 1
Min pulse width=40 ms
GPI IN 2
Min pulse width=40 ms

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HCO-1822 | 5
3 Operation
3.1 Control options
The HCO-1822 can be controlled in different ways:
•The local control panel and its push-buttons can be used to move through a menu of parameters and to adjust
parameter values (see section 3.3).
•Grass Valley’s iControl system can be used to access the card’s operating parameters from a remote computer,
using a convenient graphical user interface (GUI). (see section 3.4)
3.2 Card-Edge Status LED
The status monitor LED is located on the front card-edge of the HCO-1822, and is visible through the front access
door of the DENSITÉ frame. This multi-color LED indicates the status of the HCO-1822 by color, and by
flashing/steady illumination.
The chart shows how the various error conditions that can be flagged on the HCO-1822 affect the LED status.
•If a cell is gray, the error condition cannot cause the LED to assume that status
•If more than one LED status is possible for a particular error condition, the status is configurable.
See Section 3.4.14 for details.
•The factory default status is shown by a 
The LED will always show the most severe detected error status that it is configured to display, and in the chart error
severity increases from left to right, with green representing no error/disabled, and flashing red the most severe error.
LED Status
Error Condition
Green
Yellow
Red
Flashing
Red
No errors 
Backup Input 
Reference Presence 
Bypass Mode 
Video error 
Expected video format error 
Input timing out of range 
Reference mismatch 
Black detection 
Freeze detection 
Audio presence group 
Audio silence channel 
Rear presence error

Card Fan 
If the LED is Flashing Yellow, it means that the card is selected for local control using the Densité frame’s control
panel. See Section 3.3 for details.

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6| HCO-1822
3.3 Local control using the Densité frame control panel
3.3.1 Overview
Push the SELECT button on the HCO-1822 card edge
(see Section 1.4) to assign the local control panel to
operate the HCO-1822. Use the control panel buttons
to navigate through the menu, as described below.
All of the cards installed in a Densité frame are
connected to the frame’s controller card, which handles
all interaction between the cards and the outside world.
There are no operating controls located on the cards
themselves. The controller supports remote operation
via its Ethernet ports, and local operation using its
integrated control panel.
The local control panel is fastened to the front of the
CPU-ETH2 controller card, and when installed is
located in the front center of the frame, positioned in front of the power supplies. The panel consists of a display unit
capable of displaying two lines of text, each 16 characters in length, and five pushbuttons.
The panel is assigned to operate any card in the frame by pushing the SELECT button on the front edge of that card.
•Pushing the CONTROLLER button on the control panel selects the Controller card itself.
•The STATUS LED on the selected card flashes yellow.
The local control panel displays a menu that can be navigated using the four pushbuttons located beneath the display.
The functionality of the pushbuttons is as follows:
[+] [–] Used for menu navigation and value modification
[SELECT] Gives access to the next menu level. When a parameter value is shown, pushing this button once
enables modification of the value using the [+] and [–] buttons; a second push confirms the new value
[ESC] Cancels the effect of parameter value changes that have not been confirmed; pushing [ESC] causes the
parameter to revert to its former value.
Pushing [ESC] moves the user back up to the previous menu level. At the main menu, [ESC] does not
exit the menu system. To exit, re-push the [SELECT] button for the card being controlled.
If no controls are operated for 30 seconds, the controller reverts to its normal standby status, and the selected card’s
STATUS LED reverts to its normal operating mode.
3.3.2 Menu for local control
The HCO-1822 has operating parameters which may be adjusted locally at the controller card interface.
•Press the SELECT button on the HCO-1822 front card edge to assign the Densité frame’s local control panel
to the HCO-1822
•Use the keys on the local control panel to step through the displayed menu to configure and adjust the HCO-
1822.
The complete menu structure is shown in the Annex to this document, beginning on page 36.
Figure 3-1 Densité Frame local control panel

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HCO-1822 | 7
3.4 Remote control using iControl
The operation of the HCO-1822 may be controlled using Grass Valley’s iControl system.
•This manual describes the control panels associated with the HCO-1822 and their use.
•Please consult the iControl User’s Guide for information about setting up and operating iControl.
In iControl Navigator or iControl Websites, double-click on the HCO-1822 icon to open the control panel.
3.4.1 The iControl graphic interface window
The basic window structure for the HCO-1822 is shown in figure 3.2. The window identification line gives the card type
(HCO-1822) and the slot number where the card installed in its Densité frame.
There are four main sections in the window itself, identified in figure 3.2:
1. The Status Icon area shows a series of six icons that report the status
of some card parameters. Figure 3.3 shows the various forms that
may appear; their meaning is described below.
Icon 1 – Control status
•A: Green - Remote Control via iControl
•B: Yellow - Local control using the menu
Icon 2 – Reference status
•A: Green - Locked to external reference
•B: Red - Reference is missing
•C: Grey - No reference
Figure 3.3Status Icons
A
B
C
1 2 3 4 5 6
Figure 3.2 HCO-1822 iControl graphic interface window
1
2
3
4

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8| HCO-1822
Icon 3 – Input 1 status
•A: Green - Status OK; format shown
•B: Red – Error
Icon 4 – Input 2 status
•A: Green - Status OK
•B: Red - Error
Icon 5 – Bypass Status
•A: Bypass not active – switch operational
•B: Bypass activated
Icon 6 – Card Heath status
•A: Green - Fan OK and GPI Power OK
•B: Red - Fan error or GPI Power Error
When an icon shows an error state, a message describing the error in more detail will appear beneath the icons.
If there is more than one error, they will cycle through the display.
In all cases, mousing over an icon will cause a more detailed description of its current status to appear in the
message area. Error message cycling will resume when the cursor is no longer over an icon.
Move the mouse over an icon and a status message appears below the icon providing additional information. If
there is an error, the error status message appears in the message area without mouse-over.
•If there are multiple errors, the error messages cycle so all can be seen
•The icon whose status or error message is shown is highlighted with a mauve background
2. The left-hand side of the panel contains a series of buttons that control the contents of the main window (section
4). Click on one to access the indicated controls. The selected button is highlighted (darker) and the main panel
heading matched the button name.
3. At the bottom are the controls for the User presets.
4. This section contains the main operating controls and displays for managing the HCO-1822’s feature set. The
contents are selected by clicking a button on the left-hand side of the screen.
The left side of the window, containing sections 2 and 3, can be hidden or revealed by clicking the arrow icon at the
center of the left side border.
Each of the panels associated with the groups accessed from the buttons in Section 2, and shown in Section 4, is
described individually in the following sections.
3.4.2 The Switch panel
The HCO-1822 has three modes of switch operation, selected from the Select tab in the Switch control panel.
Clean switching in any of these modes is enabled by selecting the Clean Switch Enable checkbox.
•This activates the Timing panel, where the clean switch timing requirements can be set up. See section 3.4.4.
The graphic at the top of the panel identifies the input that is currently selected, and indicates the validity of both
inputs by the color of their icons.

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HCO-1822 | 9
1. Manual switch
Manually switches the HCO-1822 output between the
two possible sources: input 1 or input 2.
•Click the Manual button. The two possible sources
are shown on the left. The icon representing the
currently-selected input will show in green.
•Click on a different source. The selection shows
blue, and the Take button is activated, appearing
yellow.
•A countdown (from 10 seconds) underneath the
Take button shows how long the Take button will
remain active before it times out.
•Click the Take button while it is active to switch the
HCO-1822 output over to the other source.
2. Auto switch
Auto switch uses Alarms based on the status of the
selected input to determine whether the other input
should be selected.
•Click the Auto mode button in the Select tab to
activate the Auto mode.
Auto mode operation:
•If Input 1 fails with an alarm level of higher priority than input 2, the HCO-1822 will automatically switch over
to Input 2
•If the Switch Mode has been set to Switch and Return (see below), the HCO-1822 can automatically switch
back to Input 1 if it has a lower alarm priority than input 2.
•If the Switch Mode has been set to Switch To (see below), the HCO-1822 will not switch back to Input 1 even
if it has a lower alarm priority.
Figure 3.5Manual Switch controls
Figure 3.6Auto Mode
Figure 3.4 Switch panel

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10 | HCO-1822
•NOTE: for certain errors, the switch-over is delayed by 0.5 second beyond the selected duration because it
often happens that the same signal is feeding both inputs, possibly offset by a frame or two. The delay
ensures that the alternate feed is indeed error-free before switching to it. The errors affected are:
oVideo error (when detection duration is 1 second or more)
oBlack detect
oFreeze detect (when detection duration is 1 second or more)
oAudio silence detect
Select the Config Auto tab to select the Auto Mode functionality:
In the Switch Mode box, select:
oSwitch To: switches to the input #2 (if it is valid)
when the alarm conditions trigger a switch
oSwitch and Return: switches to input #2 (if it is
valid) when the alarm conditions trigger a switch,
and then switches back after a predetermined
interval, counted from the time the original input
returns to a valid state. Use the slider at the
bottom of the tab to set the interval (0 to 59
seconds, 1 to 10 minutes)
oToggle:switches to the other input (if it is valid) when the alarm conditions trigger a switch. It will stay on
that input until an alarm condition appears for that input in which case it will switch to the other input again
(if it is valid).
In the GPI Control Event box, select whether the HCO-1822 will change to manual mode, or remain in auto
mode, when a switch is triggered from a GPI while the HCO-1822 is in auto mode.
3. Bypass
Bypass triggers relays located on the rear panel to connect the inputs directly to the outputs. The bypassed HCO-
1822 card is electrically disconnected from the Densité signal system, and can be removed from the frame with no
discontinuity in the signal path.
When the HCO-1822 is in Bypass:
•There is no video / audio / metadata analysis
•The PVW (preview) output is disabled
•No signal is sent to the MSB in the frame
NOTE: Grass Valley recommends that you set the HCO-1822 in BYPASS before removing it from the Densité frame
to ensure no disruption in the signal when the card is removed and reinserted.
The Operating Mode can also be selected using the Menu from the local control panel (see Section 3.3), and
via the GPI interface on the rear connector panel (see Section 2.2)
Figure 3.7Configure the Auto Switch Mode

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HCO-1822 | 11
Figure 3.9Alarms panel
Preview Output tab
Use this tab to select the source for the preview output
•Auto Opposite input from that selected for the
Program output
•Input 1 Input 1
•Input 2 Input 2
•Program: the same as the Program output
3.4.3 The Alarms panel
The HCO-1822 continuously monitors the condition and
status of the input signals it is processing. The information is
used to decide whether the input must be switched in Auto
mode. It is also used to flag the status of the card in the
iControl system.
In general:
•A number of parameter values are continuously
tested against user-defined thresholds or for
presence/absence.
•Each parameter test is assigned a Level, to
determine the extent to which it contributes to the
changeover decision.
Many alarms can be enabled or disabled using the Enable
checkbox in their control panel (see below).
An alarm that is enabled:
•contributes to the switch decision process based on
its LEVEL.
•Is reflected in the device status as reported to
iControl (LEVEL has no bearing on this)
Each alarm is assigned a LEVEL that determines its
contribution to the switch decision process. Possible levels
are:
•1 – highest significance
•2 – lower significance
•OFF – not used in the switch decision process
Some alarms are arbitrarily assigned as Level 1 and cannot be
changed by the user (e.g. no signal present is always a Level 1
alarm). Their Enable checkbox is ticked, and greyed-out.
Other alarms have a pulldown in their control panel that allows the
user to set the level.
The HCO-1822 uses the most significant alarm detected for an input
as the alarm level for that input, and then uses the truth table shown
here to decide whether to switch from input 1 to input 2 and back.
INPUT 1 INPUT 2 OUTPUT:
SELECT
INPUT #
Alarm level Alarm level
1 2 1 2
○
○
x
x
1
○
●
○
○
2
○
●
○
●
1 or last
○
●
●
x
1
●
x
○
○
2
●
x
○
●
2
●
x
●
x
1 or last
●= Alarm at this level
○= No Alarm at this level
x = Don't care
Figure 3.8Preview output source selection

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12 | HCO-1822
The Alarms section of the iControl panel gives access to all alarm-related settings.
•The Video and Audio tabs show lists of the parameters for which alarms exist, and show the current settings
for each, for both inputs.
•Click on one to select it, and the control panel for adjusting that parameter appears at the bottom of the
screen.
Video – Video Error alarm
This error is always ENABLED and the level set to 1, 2 or OFF. The
factory default value is level 1.
Use the slider to set the duration for which the error must
continuously exist before the alarm is flagged. The nominal range of
durations is 0.05 to 90 seconds. When durations ≥1 sec are
selected, there is an additional 0.5 seconds intrinsic to the error
detection algorithm that will prevent switching when there are nearly-
coincident errors at the two inputs.
The LED color is not configurable.
NOTE: This is the only error that can be triggered in the ASI
operating mode. All other errors will be disabled.
Video – Format Mismatch
The user sets an expected format for each input using the pulldown in the control panel. The HCO-1822 compares
this with the actual format detected at the input, and flags an error if
they do not match, after a 0.5 second delay.
Formats listed in the pulldown are:
•525
•625
•1080i 59.94 Hz
•1080i 50 Hz
•720p 59.94 Hz
•720p 50 Hz
•SD
•HD
This error can be Enabled using the checkbox, and the level set to 1,
2 or OFF.
Use the LED Color pulldown to choose the color that will be
displayed by the status LED on the card edge when a Format
Mismatch error is detected. Choices are:
•Green, Yellow, Red, Flashing Red
Figure 3.10 Video Error alarm configuration
Figure 3.11 Format Mismatch alarm config

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HCO-1822 | 13
Video – Timing Error
This error is generated if the timing offset between the output signal
and the video input is greater than 2 lines.
•This alarm is always enabled, but is not a switch condition for
either of the inputs.
The LED color is not configurable for this alarm.
Video – Black Detect
This error detects the presence of a continuous black signal for a
period of time; the error is flagged only when the time duration
criterion has been satisfied.
This error can be Enabled using the checkbox, and the level set to 1,
2 or OFF.
The user sets the detection parameters for this error using two
sliders:
•Threshold (mV) – sets the signal level below which Black will be
considered to have been detected.
•Set Duration (sec) – sets the time interval over which Black
must be continuously detected before the error is flagged. An
additional delay of 0.5 sec is included to prevent switching
when there are nearly-coincident errors at the two inputs.
•Clear Duration (sec) – sets the time interval during which a non-
black signal must be continuously detected before a previously-
flagged Black error will be cleared.
Use the LED Color pulldown to choose the color that will be displayed
by the status LED on the card edge when a Black Detect error is
detected. Choices are:
•Green, Yellow, Red, Flashing Red
.
Figure 3.12 Timing Error alarm Config.
Figure 3.13Black Detect alarm Config.

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14 | HCO-1822
Video – Freeze Detect
This error detects the presence of a signal freeze (i.e. no change in
content) for a period of time; the error is flagged only when the time
duration criterion has been satisfied.
This error can be Enabled using the checkbox, and the level set to 1,
2 or OFF.
The user sets the detection parameters for this error using two sliders:
•Threshold – sets a sensitivity level for detection that will allow
minor level changes due to noise, but will detect a lack of
change in the picture content. The value (in the range 0 to 15)
is arbitrary, and may need to be set by trial and error depending
on the signal characteristics.
A smaller threshold value will be less tolerant to video noise
than a higher value and the card may not be able to detect the
freeze in presence of changing pixels. If you want to detect a
pure digital video freeze, you can use the value zero.
Otherwise, the threshold should be increased until a consistent
freeze is detected.
•Set Duration (sec) – sets the time interval over which a freeze
must be continuously detected before the error is flagged. The
nominal range of durations is 0.5 to 90 seconds. When
durations ≥1 sec are selected, there is an additional 0.5 seconds intrinsic to the error detection algorithm that
will prevent switching when there are nearly-coincident errors at the two inputs.
•Clear Duration (sec) – sets the time interval during which an active signal must be continuously detected before
a previously-flagged Freeze error will be cleared.
Use the LED Color pulldown to choose the color that will be displayed
by the status LED on the card edge when a Freeze Detect error is
detected. Choices are:
•Green, Yellow, Red, Flashing Red
Audio – Audio Grp 1 (same for Grp.2, 3, 4)
This error detects the absence of audio in the named group.
This error can be Enabled using the checkbox, and the level set to 1,
2 or OFF.
The user sets the detection parameter for this error using the slider:
•Duration (sec) – sets the time interval over which loss of audio
must be continuously detected before the error is flagged
Use the LED Color pulldown to choose the color that will be displayed
by the status LED on the card edge when an Audio Grp error is
detected. Choices are:
•Green, Yellow, Red, Flashing Red
Figure 3.15Audio Grp alarm config.
Figure 3.14Freeze Detect alarm Config.

GUIDE TO INSTALLATION AND OPERATION
HCO-1822 | 15
.Audio – Silence CH1 (same for CH2-16)
This error flags the continuous absence of sound level in the
specified audio channel for a specified duration.
NB – this error applies only to PCM audio
This error can be Enabled using the checkbox, and the level set to 1,
2 or OFF.
The user sets the detection parameters for this error using two
sliders:
•Threshold (dB) – sets the signal level below which silence will
be considered to have been detected.
•Duration (sec) – sets the time interval over which silence must
be continuously detected before the error is flagged. An
additional delay of 0.5 sec is included to prevent switching
when there are nearly-coincident errors at the two inputs.
Use the LED Color pulldown to choose the color that will be
displayed by the status LED on the card edge when a Silence CH
error is detected. Choices are:
•Green, Yellow, Red, Flashing Red
Global alarms
The parameters found under the Global tab do not have individual control panels.
These alarms DO NOT CONTRIBUTE to the switch decision
process, but are included in the card status.
Four parameters are included in the Global Alarms list:
•Ref Presence – checks for the presence of a reference
signal on the rear panel connector
•Backup input – LED remains Red as long as the backup
input (input 2) is selected – valid in AUTO MODE only
•Bypass Mode – indicates whether the HCO-1822 is in
Bypass mode
•GPI Power Box – detects whether a GPI box is supplying
power to the GPI connector on the rear panel. Displays an
error when the alarm is enabled and no power is detected.
Each parameter has two configurable features:
•Enable – click in the Enable check box to include the alarm in the card status
•LED Color - click on the color name in the LED Color column and a pulldown will appear offering the choice of
Green, Yellow, Red or Flashing Red. The current status is shown by the colored icon in the right-hand column
Figure 3.16Silence CH alarm configuration
Figure 3.17Global alarms

GUIDE TO INSTALLATION AND OPERATION
16 | HCO-1822
In1->In2
Click the checkbox to force all alarm parameters for input 2 to
match those set for input 1.
•When this is selected, only one set of alarm parameters
is displayed for both inputs.
•When the checkbox is deselected, the alarm parameters
for input 2 revert to their previous values, i.e. as they
were before the checkbox was selected.
3.4.4 The Timing panel
NOTE: this panel is only available when the Clean Switch Enable checkbox is selected in the Switch panel (see
section 3.4.2).
The PGM output timing, with respect to a detected reference, is programmable from -2 to +2 video lines with
programmable increments at -2, -1, -½, 0, +½, +1, or +2 lines.
In order for no output timing errors to occur, the input source must be synchronized (phased) to within a pre-defined
window. The size of this window will always remain the same length for a given format, but the start and end of the
window is a function of the user-programmed output timing. The size of the window is [2 lines less 12.3µs] for SD
sources and [2 lines less 4.5µs] for HD sources. The following examples illustrate this concept.
•Example (a) shows the supported input timing window for a user-programmed output timing of +1 line. In order for
the HCO-1822 to guarantee no output timing errors, the input signal must be phased to within -1 line of the
reference signal and +1 line – 12.3µs (SD) of the reference signal.
•Example (b) shows the supported input timing window for a user-programmed output timing of +½ line. In order
for the HCO-1822 to guarantee no output timing errors, the input signal must be phased to within -1½ line of the
reference signal and +½ line – 12.3µs (SD) of the reference signal.
Notice for both examples, that the size of the supported input range is 2 lines – 12.3µs (SD) and 2 lines – 4.5µs (HD).
Reference
Supported input range
Output timing
1H
1H 1H - 12.3us (SD)
1H - 4.5us (HD)
Reference
Supported input range
Output timing
½H
½H - 12.3us (SD)
½H - 4.5us (HD)
1½H
(a) Output timing = +1H (b) Output timing = +1/2H
Figure 3.19 Output timing examples
Figure 3.18IN1 IN2 alarm configuration