pro bel 4408 User manual

ontents
1Introduction
2Installation 4
.1Signal I/O and control pinout 5
.Crosspoint control 7
3onfiguration 10
3.1Input set-up 1
3.Configuring an 8x1 switcher 13
3.3Source expansion 14
3.4Level expansion 17
3.5Building a 64 input switcher 19
3.6Using the 4408 with the 4405 re-framer 3
4Trouble shooting 4
5OSMOS status monitoring 6
6Specification 8
7Ordering Information 30
Technical Manual 1
4408Digital Audio 8x1 Switch

1Introduction
he 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.
he switcher provides a solution for small ancillary or monitoring matrices with the
benefit of simple button per crosspoint control.
he architecture of the modules allow crosspoint outputs to be bussed together to
allow switchers above eight inputs to be built. In addition the AES/EBU digital audio
switcher may be configured with other modules in the Pro-Bel range to form married
multi-level matrices.
An onboard rechargeable battery provides retention of crosspoint settings after
power loss.
Characteristics of the 4408 module are:
•I/O selectable for balanced or unbalanced operation
•easy expansion up to 64 inputs
•flexible control, with button per crosspoint or binary addressing
•synchronised switching using an external video field pulse
•can be used with the 4405 re-framer for glitch-free switching
•standalone and master slave configuration
•crosspoint memory via battery backup
•card edge yellow LED crosspoint tally display
•compatible with Pro-Bel COSMOS status monitoring
2Issue 3
4408

Technical Manual 3
4408Digital Audio 8x1 Switch
CONTROL
INPUTS AND
LAMP SUPPLY
DC POWER
AND
STATUS DATA
AUD / CNTL
EXP IN
AUD / CNTL
EXP OUT
ADDRESS
EXP OUT
BAL/UNBAL
DIGITAL
AUDIO
INPUTS
BAL/UNBAL
DIGITAL
AUDIO
OUTPUT
ADDRESS
EXP IN
CONTROL
LOGIC
POWER
REG
EXPANSION
CONFIG
BATT
OUTPUT
SWITCH
STATUS
MON
8x1
SWITCH
he 4408 audio switch

2Installation
he 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.
For module and rear connector installation please refer to the appropriate ICON
rackframe section of the manual.
4Issue 3
4408
SF1
SF2
4408
POLL
POWER
BINA Y
PL9 OFF PL10
ON
PL12
PL13
PL7
OFF
ON
PL8
CHAN SEL
1
2
3
4
5
6
7
8
PL14
OFF
ON
OFF
ON
PL11
CONT OL
CONT OL
BINA Y
I/P
1
11
1
O/P
MAKE
B K
MAKE
B K
BIN
BUT
BIN
BUT
PL3
PL2
he 4408 digital audio 8x1 switch

2.1Signal I/O and control pinout
he 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.
Technical Manual 5
4408Digital Audio 8x1 Switch
Signal I/O (K4408.2B)
PinFunctionPinFunction
1IP3- 14 IP7-
IP3-+ 15 IP7+
3GND 16 GND
4IP4- 17 IP8-
5IP4+ 18 IP8+
6OP- 19 N/C
7OP+ 0 N/C
8GND 1 IP5-
9IP1- IP5+
10 IP1+ 3 GND
11 GND 4 IP6-
1 IP2- 5 IP6+
13 IP2+
K4408
.2B
S
I
G
N
A
L
I
/
O
C
O
N
R
O
L
ontrol Pin outs
PinFunctionPinFunction
1SEL 1 9A0EX
SEL 2 10 A1EX
3SEL 3 11 A2EX
4SEL 4 1 A3EX /64x1
5SEL 5 13 LAMPSUP
6SEL 6 14 OV
7SEL 7 15 SCREEN
8SEL 8

he 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.
6Issue 3
4408
K4408
.3U
AES OU
7
5
3
1
8
6
4
2
CON ROL
AES IN
ontrol Pin outs
PinFunctionPinFunction
1SEL 1 9A0EX
SEL 2 10 A1EX
3SEL 3 11 A2EX
4SEL 4 1 A3EX /64x1
5SEL 5 13 LAMPSUP
6SEL 6 14 OV
7SEL 7 15 SCREEN
8SEL 8

2.2rosspoint control
onnecting 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
‘BUON’.
he analogue audio switcher card has priority switching built in. If two keys are
pressed simultaneously, the higher numbered one will be selected. his feature
allows signal ‘line up’ to be performed quickly. o achieve this, one key must be
held down and a higher numbered key pushed and released. Each time the higher
numbered key is pushed and released that source will be selected, as long as the
button is held down. Once the button is released, the previous source is selected
again.
wo 8x1 modules may be independently controlled from a 16 button panel, such as
the Pro-Bel 6202. his particular panel has two separate connectors to plug into the
control socket on each module, simplifying the installation. If the internal
expansion cables are fitted (see Source expansion), priority switching can be
performed across several modules. he highest priority module will always be the
left most, viewed from the front of the cards.
Using binary control
o use binary control instead of a button panel, PL3 must be set to ‘BIN’. Crosspoints
may be then selected by binary addressing using 12V CMOS levels.
Technical Manual 7
4408Digital Audio 8x1 Switch
SEL 1 SEL SEL 3 SEL 4 SEL 5 SEL 6 SEL 7 SEL 8OV LAMPSUP GND
Example 8 way button panel wiring

* 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. o
select an input the correct binary address is needed and A3EX must be logic 0. For
source expansion, all other modules whose inputs are not selected, A3EX must be
at logic 1.
Binary control signals can be generated by one 8x1 module and fed to another, to
create a master slave configuration. o achieve this, the lower expansion cable on
the front of the cards must be fitted, and all slave modules set to binary mode. he
master module can be set to button mode and conveniently driven from a button
panel.
Note: he A3 EX line (input) becomes the 64x1 select line (output) for systems
expanded to 64x1 with PL6 in the ON position.
8 Issue 3
4408
Binary addressing
I/PAEXTA1EXTA0EXTA3EXT
10000
0010
30100
40110
51000
61010
71100
81110
*XXX1

Technical Manual 9
4408Digital Audio 8x1 Switch

3onfiguration
he module is easy to configure and build into expanded systems using expansion
cables and jumpers.
10 Issue 3
4408
4408 8x1 switch schematic view
PL7
PL8PL10
PL4
PATH +
PL5
DIS OUT
PL11
LO K I/O
PL12
FLD TRIG
PL13
BATT SUP
PL14
8x1
8 BALANCED OR UNBALANCED
DIGITAL AUDIO INPUTS
BAL/UNBAL
DIGITAL AUDIO
OUTPUT
PL9
EXPANSION
ENABLE
JUMPERS
STATUS DATA
STATUS
MON
CONTROL PANEL AND
BINARY SELECT LINES
LAMP SUPPLY
LOW VOLTAGE
DC SUPPLY
MODE
BUTTON/BIN
PL3
PL6
PL2
64X1 SELET
MUTE
HANNEL SELET LEDS
H 1
H 2
H 3
H 4
H 5
H 6
H 7
H 8
POWER LED
CONTROL
LOGIC
POWER
REG
BATT PATH -
PL23 - PL26
INPUT
SET-UP 8x1
OUTPUT
SWITCH
onfiguration jumpers
JumperConditionFunction
PL MU EUsed with the 4405 re-framer
PL3 BU ON
BIN
Simple button per crosspoint control
Binary control, used in expanded systems and computer control
PL4&PL5 OFF or ONAudio expansion bus , used when expanding sources
PL6 OFF or ON64x1 select, modifies binary addressing when expanding above 32x1
PL11 OFF or ONDIS OU , used to disable downstream cards when expanding sources
PL1 OFF or ONCLOCK I/O, output clock for downstream cards when expanding sources
PL13 OFF or ON FIELD RIGGER, used to distribute to downstream cards for synchronous
switching
PL14 OFF or ON Battery supply, used to distribute 3.6V crosspoint retention power to
other boards in a system
PL 3-PL 6 Five positionUsed to select set-up for each input - see separate chart

Technical Manual 11
4408Digital Audio 8x1 Switch
Jumper locations at front of card
SF1
SF2
PL2
Jumper locations near edge connector
4408
POLL
POWER
BINA Y
PL9 OFF PL10
ON
PL12
PL13
PL7
OFF
ON
PL8
CHAN SEL
1
2
3
4
5
6
7
8
PL14
OFF
ON
OFF
ON
PL11
CONT OL
CONT OL
BINA Y
I/P
1
11
1
O/P
MAKE
BK
MAKE
BK
BIN
BUT
BIN
BUT
PL3

3.1Input set-up
Jumpers are provided so that the eight inputs may be configured for different
termination values and set for balanced or unbalanced operation.
12 Issue 3
4408
Example: all inputs set to balanced, 110Ω
Example: all inputs set to Hi-Z, unbalanced

3.2onfiguring an 8x1 switcher
he 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. All other jumpers positions can be ignored since they
only affect expansion.
Configuration changes are accomplished by pulling the jumper (the shaded area
above) from its current position on the header pins and moving it to the alternate
position desired. he jumper must make electrical contact with at least two pins.
Technical Manual 13
4408Digital Audio 8x1 Switch
PL3 rosspoint control mode
PositionFunction
BUTTON Crosspoint selection using a button panel
BIN Crosspoint selection using binary control

3.3Source 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.
14 Issue 3
4408
CONTROL
INPUTS
1 TO 8
AUDIO INPUTS
1 TO 8 AUDIO
OUTPUT
EXPANSION
CONFIG
PL9
8 X 1
PL7
PL10PL8
PL4,5: ON
PL11,12: ON
PL13,14: OFF
CONTROL
INPUTS
9 TO 16
AUDIO INPUTS
9 TO 16 AUDIO
OUTPUT
EXPANSION
CONFIG
PL9
8 X 1
PL7
PL10PL8
CONTROL
INPUTS
17 TO 4
AUDIO INPUTS
17 TO 4 AUDIO
OUTPUT
EXPANSION
CONFIG
PL9
8 X 1
PL7
PL10PL8
CONTROL
INPUTS
5 TO 3
AUDIO INPUTS
5 TO 3 AUDIO
OUTPUT
EXPANSION
CONFIG
PL9
8 X 1
PL7
PL10PL8
PL6 64x1
OFF
PL3 MODE
BUTTON
PL6 64x1
OFF
PL3 MODE
BUTTON
PL6 64x1
OFF
PL3 MODE
BUTTON
PL6 64x1
OFF
PL3 MODE
BUTTON
PL4,5: ON
PL11,12: ON
PL13,14: OFF
PL4,5: ON
PL11,12: ON
PL13,14: OFF
Expanding to 16, 24 and 32 x 1

Synchronous switching
If synchronous switching using a video vertical timing pulse is required, an extra
module such as a 3408 digital video 8x1 switch or a 3438 analogue video 8x1 switch
with a 2315 sync separator is required.
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. he 3408/3438 should be jumpered to
only provide the vertical timing pulse on the control bus.
Technical Manual 15
4408Digital Audio 8x1 Switch
PL7
PL8
BEHIND PL7
PL9
PL7
PL8
BEHIND PL7
PL9
PL7
PL8
BEHIND PL7
PL9
PL7
PL8
BEHIND PL7
PL9
4
4
0
8
4
4
0
8
4
4
0
8
4
4
0
8
VID/CN L EXPANSION
SIGNAL FLOW
Expansion cabling for an asynchronous 32x1 switcher
Source expansion jumper settings with button control and
asynchronous switching
JumperSettingFunction
PL3 BU ONControl mode
PL4 & PL5 ONDigital audio signal expansion O/P
PL6 OFF64x1 select signal
PL11 ONDIS OU priority switching signal
PL1 ONOutput clock
PL 13 OFFSynchronous switching mode
PL14 OFFCommon battery supply line

he following rules apply to source expansion from 16x1 to 32x1:
•only audio/control expansion bus used
•expansion jumpers not needed on last card in chain
•buffered outputs available from all cards
•Synchronous switching between audio sources is only possible if all sources are
synchronised to one reference.
16 Issue 3
4408
PL7
PL8
BEHIND PL7
PL9
PL7
PL8
BEHIND PL7
PL9
PL7
PL8
BEHIND PL7
PL9
3
4
0
8
4
4
0
8
4
4
0
8
4
4
0
8
VID/CN L EXPANSION
VER SYNC PL7
PL8
BEHIND PL7
PL9
4
4
0
8
Source expansion jumper settings with button control and
synchronous switching
JumperSettingFunction
PL3 BU ONControl mode
PL4 & PL5 ONDigital audio signal expansion O/P
PL6 OFF64x1 select signal
PL11 ONDIS OU priority switching signal
PL1 ONOutput clock
PL 13 ONSynchronous switching mode
PL14 OFFCommon battery supply line
Expansion cabling for synchronous 32x1 switcher

3.4Level 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. his mode is called master/slave and
utilises the binary control interconnections.
he master card can be driven from a button panel and all other cards by binary
addressing using only the lower expansion connectors PL8-PL9 on the front of the
card.
In this example of a synchronous three level audio switcher, both address and
control/audio expansion bus connectors are used. It may be desirable to distribute a
vertical interval trigger signal from an external card to ensure switching during the
correct line of a reference video field. his is why the aud/cntl ribbon is used.
However, the AUD expansion jumpers PL4 and PL5 must be off on all cards.
Technical Manual 17
4408Digital Audio 8x1 Switch
CONTROL
INPUTS
1 TO 8
AUDIO LEVEL 1
INPUTS 1 TO 8 AUDIO LEVEL 1
OUTPUT
VERTICAL PULSE
FROM VIDEO MODULE
EXPANSION
CONFIG
PL8
8 X 1
PL6
PL9PL7
AUDIO LEVEL
INPUTS 1 TO 8 AUDIO LEVEL
OUTPUT
EXPANSION
CONFIG
PL8
8 X 1
PL6
PL9PL7
AUDIO LEVEL 3
INPUTS 1 TO 8 AUDIO LEVEL 3
OUTPUT
EXPANSION
CONFIG
PL8
8 X 1
PL6
PL9PL7
PL6 64x1
OFF
PL3 MODE
BUTTON
PL6 64x1
OFF
PL3 MODE
BIN
PL6 64x1
OFF
PL3 MODE
BIN
PL4,5: OFF
PL11,14: OFF
PL12,13: ON
ONLY ONTROL
MODE JUMPER,
PL3 MUST BE
SET ON
LAST ARD
PL4,5: OFF
PL11,14: OFF
PL12,13: ON
Example of level expansion:
synchronous three level audio 8x1 switcher

he following rules apply to synchronous level expansion
•Address and control expansion buses used
•Expansion jumpers not needed on last card in chain
•Synchronous switching between audio sources is only possible if all sources are
already synchronised to one reference
18 Issue 3
4408
Example of three level expansion wiring
PL7
PL8
BEHIND PL7
PL10
BEHIND PL9
PL9
PL7
PL8
BEHIND PL7
PL10
BEHIND PL9
PL9
PL7
PL8
BEHIND PL7
PL10
BEHIND PL9
PL9
VID/CN L EXPANSION
4
3
0
8PL7
PL8
BEHIND PL7
PL9
PL10
BEHIND PL9
4
4
0
8
4
4
0
8
4
4
0
8
ADDRESS EXPANSION
Vert Sync
onfiguring level expansion with synchronous switching
JumperMaster card Slave cardsFunction
PL3 BU ONBINControl mode
PL4 & PL5 OFFOFFAnalogue audio signal expansion O/P
PL6 OFF or ONOFF or ON64x1 select signal
PL11 OFFOFFDISOU , priority switching signal
PL1 ONONCLK I/O, output clock
PL13 ONONField trigger, crash/sync switching mode
PL14 OFFOFFCommon battery supply
Note: For asynchronous level expansion only the address expansion cabling is
required and PL13 should be OFF on all cards.

3.5Building a 64 input switcher
o create a 64x1 an extra audio switcher card is needed to act as a combiner module.
Note: With PL6 set to ON, each card in each 32x1 block has the 64x1 SEL address
lines bussed together using the address expansion connectors. he 64x1 SEL line is
also brought to pin 12 of the control connector on each rear connector. his address
line forms an active low select line for each 32x1 block, which then become the 2
channel select signals for combiner module by making external connections.
Technical Manual 19
4408Digital Audio 8x1 Switch
CONTROL
INPUTS
1 TO 3
AUDIO INPUTS
1 TO 3 1ST 3 X 1
AUDIO OUTPUT
VERTICAL PULSE
FROM VIDEO CARD
CONTROL
INPUTS
33 TO 64
AUDIO INPUTS
33 TO 64
CONTROL INPUTS
1-3 TO SEL 1
33-64 TO SEL
AUDIO INPUTS
1 AND
NOTE:
LAST CARD IN EACH
3 X1 BLOCK HAS
EXPANSION JUMPERS
PL4 and PL5 SET
TO OFF
EXPANSION
CONFIG
PL9
8 X 1
32 X 1
PL7
PL10PL8
PL4,5: ON
PL11,12,13: ON
PL14: OFF
PL6 64x1
ON
PL3 MODE
BUTTON
64 X 1
AUDIO OUTPUT
NOTE:
COMBINER NEEDS
ONLY PL3 SET TO
BUTTON
EXPANSION
CONFIG
PL9
8 X 1
PL7
PL10PL8
PL6 64x1
ON
PL3 MODE
BUTTON
32 X 1
EXPANSION
CONFIG
PL9
8 X 1
PL7
PL10PL8
PL6 64x1
ON or OFF
PL3 MODE
BUTTON
OMBINER
ND 3 X 1
AUDIO OUTPUT
PL4,5: ON
PL11,12,13: ON
PL14: OFF
NOTE:
LAST CARD IN EACH
3 X1 BLOCK HAS
EXPANSION JUMPERS
PL4 and PL5 SET
TO OFF
Building a synchronous 64x1 switch

20 Issue 3
4408
Building a 64x1 synchronous switch
Jumper
1st 3 cards
in 3x1
block
Last card
in 3x1
block
Combiner Function
PL3 BU ONBU ONBU ONControl mode
PL4 & PL5 ONOFFOFFAnalogue signal expansion O/P
PL6 ONON ON or OFF64X1 select signal
PL11 ONOFFOFFDISOU , priority switching signal
PL1 ONOFFOFFCLK I/O, output clock
PL13 ONONON F LOGIC, synchronous switching
mode
4
3
0
8
4
4
0
8
4
4
0
8
4
4
0
8
4
4
0
8
4
4
0
8
4
4
0
8
4
4
0
8
4
4
0
8
4
4
0
8
VID/ NTL
EXPANSION
OMBINER
LAST ARD IN 32X1 BLO KS
VERT SYN
ADDRESS
EXPANSION
1ST 32 X 1 BLO K
2ND 32 X 1 BLO K
Source expansion with vertical sync reference