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pro bel 4408 Technical Manual

Digital audio 8x1 switch
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4408
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Technical Manual
Digital Audio 8x1 Switch
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Summary of Contents for pro bel 4408

  • Page 1: Table Of Contents

    Signal I/O and control pinout Crosspoint control Configuration Input set-up Configuring an 8x1 switcher Source expansion Level expansion Building a 64 input switcher Using the 4408 with the 4405 re-framer Trouble shooting COSMOS status monitoring Specification Ordering Information Technical Manual...

  • Page 2: Introduction

    4408 Introduction The 4408 is an eight input, one output AES/EBU digital audio switcher with a choice of rear connector to support balanced or unbalanced I/O. It is designed to fit in the 1050 3U and 1051 1U Pro-Bel ICON modular product rackframes.
  • Page 3 BAL/UNBAL SWITCH DIGITAL SWITCH BAL/UNBAL AUDIO DIGITAL INPUTS AUDIO OUTPUT CONTROL CONTROL INPUTS AND LOGIC LAMP SUPPLY EXPANSION BATT CONFIG POWER DC POWER STATUS STATUS DATA ADDRESS AUD / CNTL EXP OUT EXP OUT The 4408 audio switch Technical Manual...

  • Page 4: Installation

    4408 Installation The 8x1 digital audio switch consists of an 4408 ICON module which fits in either a 1U 1051 or a 3U 1050 ICON Pro-Bel modular rackframe. It is available with two rear connectors, the 20mm K4408.2B for balanced signals and the 30mm K4408.3U for unbalanced signals.

  • Page 5: Signal I/O And Control Pinout

    4408 Digital Audio 8x1 Switch Signal I/O and control pinout The K4408.2B rear connector has one 25 way ‘D’ female socket for balanced signal I/O and one 15 way ‘D’ type socket for control. Signal I/O (K4408.2B) K4408 Function Function...
  • Page 6 4408 The K4408.3U uses the same 15 way ‘D’ connector for control but BNC connectors are used for the unbalanced signal I/O. Where possible, the ICON colour scheme reserves a grey background for outputs and a white background for inputs.

  • Page 7: Crosspoint Control

    4408 Digital Audio 8x1 Switch Crosspoint control Connecting button panels Crosspoints may be selected by connecting a button panel (eg. Pro-Bel’s 8 button 6200 or 16 button 6202) to the control socket on the rear panel and setting PL3 to ‘BUTTON’.
  • Page 8 4408 Binary addressing A2EXT A1EXT A0EXT A3EXT * Crosspoint output is tri-stated - used for system expansion. LOGIC 1 = +12V, LOGIC 0 = 0V For externally supplied binary signals wiring must be made to the rear panel. To select an input the correct binary address is needed and A3EXT must be logic 0. For source expansion, all other modules whose inputs are not selected, A3EXT must be at logic 1.
  • Page 9 4408 Digital Audio 8x1 Switch Technical Manual...

  • Page 10: Configuration

    JUMPERS POWER PL13 PL14 FLD TRIG BATT SUP STATUS STATUS DATA PL10 4408 8x1 switch schematic view Configuration jumpers Jumper Condition Function MUTE Used with the 4405 re-framer BUTTON Simple button per crosspoint control Binary control, used in expanded systems and computer control PL4&PL5...
  • Page 11 4408 Digital Audio 8x1 Switch CHAN SEL 4408 CONTROL MAKE CONTROL PL14 MAKE PL13 PL10 PL12 BINARY BINARY PL11 POLL POWER Jumper locations at front of card RSF2 RSF1 Jumper locations near edge connector Technical Manual...

  • Page 12: Input Set-Up

    4408 Input set-up Jumpers are provided so that the eight inputs may be configured for different termination values and set for balanced or unbalanced operation. Example: all inputs set to balanced, 110Ω Example: all inputs set to Hi-Z, unbalanced Issue 3...

  • Page 13: Configuring An 8X1 Switcher

    4408 Digital Audio 8x1 Switch Configuring an 8x1 switcher The simplest configuration is a single 8x1 module without expansion. Control of the switcher may be from either a simple control panel or in binary form from a more complex control system such as a computer. PL3 is used to establish the method of crosspoint control.

  • Page 14: Source Expansion

    Several analogue audio switcher cards can be linked to make larger switchers up to 64x1. For switchers up to 32x1, only 4 modules are needed. Larger switchers need an extra 4408 as a combiner module. Expansion employs the front of card connectors together with the ribbon cables supplied with the card.
  • Page 15 In addition, a ribbon cable from PL7 on the 3408/3438, should be connected to PL 7 on the upsteam (left most) 4408 in a system. The 3408/3438 should be jumpered to only provide the vertical timing pulse on the control bus.
  • Page 16 4408 BEHIND PL7 BEHIND PL7 BEHIND PL7 BEHIND PL7 VERT SYNC VID/CNTL EXPANSION Expansion cabling for synchronous 32x1 switcher Source expansion jumper settings with button control and synchronous switching Jumper Setting Function BUTTON Control mode PL4 & PL5 Digital audio signal expansion O/P...

  • Page 17: Level Expansion

    4408 Digital Audio 8x1 Switch Level expansion It may be useful in some applications for one card to control the input selection of other cards to create a multi-level switcher. This mode is called master/slave and utilises the binary control interconnections.
  • Page 18 4408 BEHIND PL7 BEHIND PL7 BEHIND PL7 BEHIND PL7 Vert Sync VID/CNTL EXPANSION ADDRESS EXPANSION PL10 PL10 PL10 PL10 BEHIND PL9 BEHIND PL9 BEHIND PL9 BEHIND PL9 Example of three level expansion wiring Configuring level expansion with synchronous switching Jumper...

  • Page 19: Building A 64 Input Switcher

    4408 Digital Audio 8x1 Switch Building a 64 input switcher To create a 64x1 an extra audio switcher card is needed to act as a combiner module. VERTICAL PULSE FROM VIDEO CARD 32 X 1 AUDIO INPUTS 1ST 32 X 1...
  • Page 20 4408 LAST CARD IN 32X1 BLOCKS COMBINER VERT SYNC VID/CNTL EXPANSION ADDRESS EXPANSION 1ST 32 X 1 BLOCK 2ND 32 X 1 BLOCK Source expansion with vertical sync reference Building a 64x1 synchronous switch 1st 3 cards Last card Combiner...
  • Page 21 4408 Digital Audio 8x1 Switch K4408 K4408 K4408 32x1 O/P 64x1 O/P 32x1 O/P SEL 1 A3 EXT/ A3 EXT/ 64x1 64x1 SEL 2 Any card in 1st Any card in 2nd Combiner 32x1 block 32x1 block I/O and CNTL...
  • Page 22 4408 K4408 K4408 K4408 AES IN AES IN AES IN CONTROL CONTROL CONTROL SEL 1 A3 EXT/ A3 EXT/ SEL 2 64x1 64x1 AES OUT AES OUT AES OUT 32x1 O/P 32x1 O/P 64x1 O/P Any card in 1st Any card in 2nd...

  • Page 23: Using The 4408 With The 4405 Re-Framer

    It is possible that bitstream corruption may occur when switching inputs. This may occur even if all signals are co-timed and referenced to video and when the 4408 uses a vertical switching reference derived from the same reference. Bitstream corruption could cause downstream equipment to lose lock briefly, resulting in audible defects.

  • Page 24: Trouble Shooting

    - the LED on the button panel should • show the same channel number as the CHAN SEL LED on the front of the 4408 module check the output connection from the rear panel to the monitoring device and •...
  • Page 25 4408 Digital Audio 8x1 Switch Technical Manual...

  • Page 26: Cosmos Status Monitoring

    4408 COSMOS status monitoring If the frame is equipped with a COSMOS controller card the following parameters will be reported back to the COSMOS status monitoring system: module present • power OK • input selected • In addition, the module is programmed with the following information, which can be read by the status monitoring controller: •...
  • Page 27 4408 Digital Audio 8x1 Switch Technical Manual...

  • Page 28: Specification

    4408 Specification Inputs Number and type: 8, balanced, transformer coupled to AES3-1992 or unbalanced to AES3-id Termination: High, 75Ω or 110Ω Outputs Number and type: 1, transformer coupled, balanced to AES3-1992 or unbalanced to AES3-id Performance Bitstream integrity: Transparent to all AES/EBU parameters...
  • Page 29 4408 Digital Audio 8x1 Switch Technical Manual...

  • Page 30: Ordering Information

    4408 Ordering Information ICO-4408-2B00 8x1 Digital Audio Switch with 20mm rear panel providing balanced AES3 interfaces ICO-4408-3U00 8x1 Digital Audio Switch with 30mm rear panel providing unbalanced AES3 interfaces Issue 3...

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