GRASS VALLEY T2 iDDR Application Note

Preparing Two T2 iDDRs for Synchronized 4K Playback

Hiroshi Kobayashi

January 2015

APPLICATION NOTE PREPARING TWO T2 IDDRS FOR SYNCHRONIZED 4K PLAYBACK

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www.grassvalley.com

his application note explains how to set up multiple T2 units for synchronized 4K playback.

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Introduction

The Grass Valley, a Belden Brand, T2 iDDR has two independent, Full
HD output channels that can be used for multiscreen events, digital
signage and projection mapping when playback is synchronized.
This application note explains how to set up multiple T2 units for
synchronized playback.

UHD and UltraHD are marketing terms that are often used to describe
QFHD, a video resolution with four times the number of pixels of full
HD. We are familiar with Full HD being described as 1080p, and in
the same way QFHD, because it has a resolution of 3840x2160, can
also be referred to 2160p or 4K (an approximation of the number of
horizontal pixels).

System Overview

Schematic of 4K/QFHD (3840x2160) playback from two synchronized T2 units:

Tools Used

• Multiple T2 units

• GPI or RS-422 controller

• Sync Generator

Note: To prepare 4K clips for playback on T2 using the Grass Valley
EDIUS nonlinear editing system, see the application note: Using
EDIUS to Prepare 4K (QFHD) Material for Playback on Two T2 iDDRs.

GPI or RS422(BVW)

GPI or RS422

Controller

Sync

Ref

Generator

Ref

ADVC G4

Ref

GPI or RS422(BVW)

• Recommended system requirements are as follows:

T2

• Multiple T2 units — preferably same model and same software ver­sion

• T2 Elite/Pro/Express (Service Pack 2.0 or later)

• T2 Classic (Service Pack 4.4 or later)

• Playback on T2 is 1920x1080 59.94i/50i via SDI

• Supported synchronized operations are “PLAY” and “STOP”

GPI or RS-422 controller

• GPI

– Sends trigger signal with V Sync

- Exclude 3 ms before and after V Sync frame

– Requires multiple GPI output channels

- TWO channels are required to synchronize two T2 units: T2 (1)
GPI + T2 (2) GPI

SYNCHRONIZE

T2

P1 SDI out

P2 SDI out

Projector

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2

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Projector

P1 SDI out

P2 SDI out

• RS-422 (BVW protocol)

– Synchronized with reference signal

- Requires multiple RS-422 output channels

- FOUR channels are required to synchronize two T2 units: T2
(1) P1 + T2(1) P2 + T2 (2) P1 + T2(2) P2

• Note: Using GPI and RS-422 controllers simultaneously is NOT
supported

Sync Generator

• Tri-level sync support required

• Requires multiple output channels

– To synchronize two T2 units, THREE reference out channels are

required: T2 (1) + T2 (2) + Controller

• Recommended : Grass Valley ADVC-G4

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