MECHANICAL
Standard Crystal Vision module 266mm x 100mm
With DA6 board fitted: 'Double decker' module 266mm x 100mm (uses two frame slots)
Weight: 180g (or 240g with DA6 fitted)
Power consumption: 11 Watts (plus 3 Watts for DA6 and 0.6 Watts for FIP or FOP)

INTEGRATED FIBRE OPTIONS
Q-Down-AG 3G can be given integrated fibre connectivity by fitting either the FIP fibre input option or FOP fibre output option. The chosen option should be fitted at the factory
To access the optical inputs or outputs an RM57 frame rear module must be used
When fitted with a FIP or FOP, Q-Down-AG 3G can be housed in any frame slot position but due to its extra height it is not possible to place Standard Definition or audio boards directly above it when the Q-Down-AG 3G is in even numbered slot positions. 3Gb/s and HD boards do not share this restriction. If a DA6 top board is also fitted, this positioning restriction does not apply
FIP and FOP meet the SMPTE 297-2006 short-haul specification, allowing operation with single-mode and multi-mode fibre
Laser safety classification: Class 1 (EN 60825), Class I (21CFR1040.10)
Connector type: SC/PC
FIP:
Optical wavelength: 1260-1620nm
Input level maximum: -1dBm
Input level minimum: Typical -20dBm (-18dBm 3Gb/s pathological)
FOP:
Optical power: Max -0.0dBm, min -5.0dBm (typical -2.0dBm or 630uW)
Fibre pigtail: Single-mode 8/125uM
Optical wavelength: 1290-1330nm (1310 typical)
Extinction ratio: 7.5dB

VIDEO INPUT
One 3Gb/s or HD or SD input with reclocking
When using FIP fibre input option allows selection between one optical and one electrical input. The input loop-throughs will show whichever input has been selected
270Mb/s or 1.5Gb/s or 3Gb/s serial compliant to EBU 3267-E, SMPTE 259M, SMPTE 292M and SMPTE 424M
3Gb/s cable equalisation up to 80m using Belden 1694A. HD cable equalisation up to 140m with Belden 1694A or equivalent (approx. 100m with Belden 8281). SD cable equalisation >250m Belden 8281 or equivalent
Input return loss: -15dB for 50MHz to 1.5GHz and -10dB for 1.5GHz to 3GHz

VIDEO OUTPUTS
Using RM41 rear module: Two equalised and reclocked loop-throughs of the 3Gb/s, HD or SD input and three video outputs
Using RM57 rear module with FIP fibre input option: One equalised and reclocked loop-through of the optical or electrical 3Gb/s, HD or SD input and three video outputs
Using RM57 rear module with FOP fibre output option: One equalised and reclocked loop-through of the 3Gb/s, HD or SD input, one dedicated HD or SDI output (on fibre) and three video outputs
If a DA6 top board is fitted:
Using RM41 and RM34 rear modules together: Eight equalised and reclocked loop-throughs of the 3Gb/s, HD or SD input and three video outputs
Using RM57 and RM34 rear modules together with FIP fibre input option: Seven equalised and reclocked loop-throughs of the optical or electrical 3Gb/s, HD or SD input and three video outputs
Using RM57 and RM34 rear modules together with FOP fibre output option: Seven equalised and reclocked loop-throughs of the 3Gb/s, HD or SD input, one dedicated HD or SDI output (on fibre) and three video outputs
The three video outputs can be a mixture of HD digital and HD analogue (RGB and YUV with integral tri-level syncs) or SD digital and SD analogue (PAL/NTSC, Y/C, YUV and RGB). Outputs configured using on board links
Output frame rate same as input frame rate
Setting the digital output to a higher format than the input will be flagged as incompatible and the output will be replaced with black, blue or muted as selected in the output incompatibility mode menu
270Mb/s or 1.5Gb/s or 3Gb/s serial compliant to EBU 3267-E, SMPTE 259M, SMPTE 292M and SMPTE 424M
Component: YUV and RGB 1 Volt +/- 2% into 75 ohm. Syncs on R, G and B
Composite: SD only. 1 Volt +/- 2% with syncs into 75 ohm. Selectable setup and Betacam levels

DOWN CONVERSIONS
1080p50 to 720p50
1080p59.94 to 720p59.94
1080p50 to 1080i50
1080p59.94 to 1080i59.94
1080p50 to 625/50
1080p59.94 to 525/59.94
720p50 to 625/50
720p59.94 to 525/59.94
1080i50 to 625/50
1080i59.94 to 525/59.94

ANALOGUE COMPONENT PERFORMANCE
Sampling: Video input is 10 bit processed for 12 bit output DACs
Monitoring quality HD component outputs
SD component performance:
Frequency response:
Luminance: +/- 0.3dB to 5.5 MHz
Chrominance: +/- 0.4dB to 2.5 MHz
Noise: <-67dB weighted luminance or chrominance
Gain error: <1%

ANALOGUE COMPOSITE PERFORMANCE (SD ONLY)
Sampling: Video input is 10 bit processed for 12 bit output DACs
Frequency response:
Luminance: +/- 0.3dB to 5.5 MHz
Chrominance: +/- 0.4dB to 2.5 MHz
Noise: <-67dB weighted luminance or chrominance
Differential gain: <2% typ
Differential phase: +/- 1 degree typ.

PICTURE PROCESSING WHEN DOWN CONVERTING
Sophisticated two dimensional filtering gets broadcast results and avoids the complication of looking at multiple fields or movement detection, resulting in reliable, artefact-free conversion with broadcast filter quality
When down converting the performance can be optimised by choosing one of four alternative filter characteristics (sharpest, sharp, soft, softest)
When the input and output are the same standard the board processing can be bypassed, so that the signal is passed without degradation
RGB and YUV lift and gain controls allow independent digital image adjustments in both the RGB and YUV domains, essential for maintaining colour fidelity. In normal operation the RGB and YUV proc-amps are active simultaneously on both the digital and analogue outputs. In bypass mode the proc-amps will only be active on the analogue output

hD TO SD ASPECT RATIO CONVERSION
16:9 Anamorphic (for 16:9 SD systems) and either 16:9 to 4:3 Letterbox, 14:9 to 4:3 Letterbox compromise or 16:9 to 4:3 Full Screen with centre cut (for 4:3 SD systems)
The four standard aspect ratios can be adjusted from their default values by using four independent sets of size, position and crop controls:
Vertical and horizontal picture size adjustment: continuous adjustment of approximately +/- 10% of nominal image size
Vertical and horizontal picture position adjust + or - 50 lines and pixels
Vertical and horizontal picture crop adjust + or - 100 lines and pixels
The colour of any picture border present can be adjusted by varying its RGB component
Copes with both analogue and digital SD blanking widths. When used with an Anamorphic conversion, the analogue blanking width option puts the active 1920 pixels from a 1080i or 1080p picture into 702 pixels of SD (rather than 720 pixels), with the rest of the pixels used to represent analogue blanking – which prevents the SD signal from losing the sides of the picture. All other aspect ratios are adjusted by a similar amount

ACTIVE FORMAT DESCRIPTION AND WIDESCREEN SIGNALLING
With 3Gb/s or HD sources Q-Down-AG 3G can select its SD output aspect ratio according to the SMPTE 2016 AFD data embedded in the input video
SMPTE 2016 AFD data can also be inserted into the output video for aspect ratio conversion by downstream equipment - either manually or by automatically following the incoming AFD data. One of 16 AFD codes is embedded in an ANC data packet, which is carried in the vertical blanking. Q-Down-AG 3G inserts the data in the default line
Widescreen signalling information can be inserted into the analogue and SDI outputs (625 line applications only). WSS can be inserted manually or be set to automatically follow the incoming AFD data. If WSS data should be present on the input video this can either be passed to the output unchanged or substituted for a user selectable code. WSS data can also be set to be blanked
Response to SMPTE 2016 AFD codes:
Auto 16:9 mode: Will give an Anamorphic aspect ratio conversion for all SMPTE 2016 AFD input codes and the output WSS/SMPTE 2016 AFD will be set to full format 16:9
Auto 4:3 mode: Output aspect ratio and WSS/SMPTE 2016 AFD data will depend on the input AFD code. Undefined/reserved and full frame AFD codes will produce a Letterbox aspect ratio with the output WSS/SMPTE 2016 AFD set to box 16:9 centre. The Pillarbox 4:3, Pillarbox 14:9 and Letterbox >16:9 AFD codes will give a centre cut conversion and set the output WSS/SMPTE 2016 AFD to full format 4:3
Auto Adaptive mode: Will give an Anamorphic aspect ratio for any full frame input, with the output WSS/SMPTE 2016 AFD set to full frame 16:9. The Pillarbox 4:3 code will give a centre cut conversion and set the output WSS/SMPTE 2016 AFD to full format 4:3. The undefined/reserved, Pillarbox 14:9 and Letterbox >16:9 codes will make no change and the previous conversion will remain. On power up the default conversion will be Anamorphic

FIXED AND VARIABLE VIDEO DELAYS
There are three video delay settings available:
‘minimum’ – the video processing delay. With a 3Gb/s or HD input the delay is 16 SD lines (Anamorphic or Full Screen) or 52 SD lines (Letterbox). With an SD input the delay is 3.8us
‘fixed’ (52 SD lines) – this allows the aspect ratio to be changed live on air without any picture disturbance, for example
‘frame’ – can be used to match a variety of equipment or to connect with equipment that has no delay
An additional variable video delay of up to one video frame, adjustable in one line steps, is also available to match other equipment in the system

EMBEDDED AUDIO PASSING
Down conversion: De-embeds and re-embeds the first four numbered audio groups. The minimum audio delay is 2.5ms. The audio delay will be 2.5ms if the video delay is less than 2.5ms – otherwise the audio delay will equal the video delay
Bypass: Audio bypassed in HANC space, with the same delay as the video

SIGNAL CHECKS
Checks can be performed on 14 video and audio parameters, with warnings of any problems provided via Statesman alarms and SNMP traps
The parameters are: Input Missing, Input Incompatible, Video Black, Video Frozen, Aspect Ratio Information, Input Audio Missing, Silence Group 1 Channels 1 and 2, Silence Group 1 Channels 3 and 4, Silence Group 2 Channels 1 and 2, Silence Group 2 Channels 3 and 4, Silence Group 3 Channels 1 and 2, Silence Group 3 Channels 3 and 4, Silence Group 4 Channels 1 and 2, Silence Group 4 Channels 3 and 4
All parameters, apart from Input Missing and Input Incompatible, can be delayed before an alarm is asserted to prevent false alarms during quiet audio periods or brief video pauses

LED INDICATION OF:
Power supplies on board
Input present
Aspect ratio selection

PRESETS
The current board settings can be saved in one of 16 locations to be recalled as required

GPI INPUT LEVELS
Active pull to ground, pulled up to +5V through 10 kohm

GPI OUTPUT LEVELS
Electrically: Open collector transistors 30V, 270 ohm current limit resistors. Pulled up to +5V through 6800 ohm

GPI INPUTS
Two GPI inputs for recall of presets

GPI OUTPUTS
Two GPI outputs. Selectable from loss of input, video black, video frozen, audio missing, audio channel silence and input incompatible

BI-DIRECTIONAL GPIS
Two GPIs are individually selectable as either preset-recalling GPI inputs or fault-reporting GPI outputs

LOCAL CONTROL
Intuitive board edge interface with two select buttons, shaft encoder and ten character alphanumeric display

REMOTE CONTROL
RS422/485
19200 baud, 8 bits, 1 stop no parity
Control from frame active front panel and remote panel
Statesman allows control from any PC on a network
SNMP monitoring and control available as a frame option