IRT Communications AVS-1210 User Manual

AVS-1210

I.R.T.

Communications

Pty Ltd | www.irtcommunications.com

Revision 06

User Manual

10 x 1 Video Switcher

AVS-1210

I.R.T.

Communications

Pty Ltd | www.irtcommunications.com

Revision 06

10 x 1 VIDEO SWITCHER

Revision History:

Revision Date By Change Description Applicable to:

01 18/10/1999 AJP Original adapted from AAS-1220 & VA-400 (10x1

switchers) manuals

S/N: > 9910000

02 06/12/1999 AJP Front and rear panel diagrams added. S/N: > 9910000
03 07/03/1997 AJP Warning note on PL 4 to PL 5 connection added. S/N: > 9910000
04 12/09/2001 SH IRT border page added for PDF format. S/N: > 9910000

SH 00COMMON.doc file contents added. S/N: > 9910000
05 12/09/1997 AL Link paths updated. S/N: > 9910000
06 22/09/2015 AL Upgraded to I.R.T. Communications company name. S/N: > 9910000

AVS-1210

I.R.T.

Communications

Pty Ltd | www.irtcommunications.com

Revision 06

USER MANUAL

Table of Contents:

Section Page

Revision History 2
Operational Safety 4
General Description 5
Technical Specifications 6
Technical Description 7
Internal adjustments 9
Configuration 9

Wire per crosspoint control 10
Tally outputs 11
Audio breakaway 12
Configuration examples 13
Configurations for up to 200 x 1 14

Installation 15

Local control 16
Connections 17

Video 17
Control 18

Front & rear panel connector diagrams 21
Maintenance & Storage 22
Warranty & Service 22

Equipment return 22

This instruction book applies to units later than S/N: 9910000.

AVS-1210

I.R.T.

Communications

Pty Ltd | www.irtcommunications.com

Revision 06

OPERATIONAL SAFETY

WARNING

Operation of electronic equipment involves the use of voltages and currents that
may be dangerous to human life. Note that under certain conditions dangerous
potentials may exist in some circuits when power controls are in the OFF position.
Maintenance personnel should observe all safety regulations.

Do not make any adjustments inside equipment with power ON unless proper
precautions are observed. All internal adjustments should only be made by suitably
qualified personnel. All operational adjustments are available externally without
the need for removing covers or use of extender cards.

AVS-1210

I.R.T.

Communications

Pty Ltd | www.irtcommunications.com

Revision 06

GENERAL DESCRIPTION

The AVS-1210 10 x 1 analogue video switcher is a self-contained, mains powered unit occupying one unit of rack
mounting space. It has the capability to switch any one of its ten loop-through inputs to its output. The output has
two isolated feeds. Selection of the required input is made via a "D" type connector mounted on the rear panel,
using a 4 or 5 bit code.

The switcher can be fitted with a CPS-1210 10 x 1 or a CPS-1220 dual 10 x 1 (20 x 1) Control Panel.

The switcher can be remotely controlled by using CPS-1050 10 x 1 or CPS-1052 20 x 1 remote control panels.

The AVS-1210 is provided with an eleventh (cascade) input to facilitate two AVS-1210 switchers to be linked
providing 20 x 1 operation using either a CPS-1220 locally or CPS-1052 remotely.

The input circuits of this series of switcher are designed for loop through operation to allow several switchers to be
stacked with common inputs, without the need for additional distribution amplifiers.

The switcher is housed in an IRT one rack unit (44 mm high) 483 mm (19 inch) rack mounting metal chassis. The
input and output circuit connections are by means of BNC sockets mounted on the edge of the printed circuit
board, accessible from the rear panel of the unit.

Control/tally connections to the switch data buss are made to a pair of 25 pin "D" connectors mounted on the rear
panel. The control system is compatible with that used for control of IRT’s AAS-1220 10 x 1 stereo audio switcher
and with 3000 series Eurocard modules.

An internal AC mains powered regulated power supply provides the operating voltages for the switcher circuitry. A
selector on the rear panel allows matching to local mains supply voltages.

Accessories

CPS-1210 10 x 1 Local control panel.
CPS-1220 20 x 1 Local control panel.
CPS-1050 10 x 1 Remote control panel.
CPS-1052 20 x 1 Remote control panel.
CDC-3060 Serial control module for interfacing to RS-232 or computer control systems.
GDW-1050 10 way HE14 to D25 male adapter cable to connect remote panel to switcher.

AVS-1210

I.R.T.

Communications

Pty Ltd | www.irtcommunications.com

Revision 06

TECHNICAL SPECIFICATIONS

Video input characteristics:

Input Signal Level 1 Vp-p.
Input Impedance Bridging 75 Ohms, Loop through.
Return loss >46 dB to 4.3 MHz.
Number of Inputs 10.
Input Connectors BNC.

Video expansion input characteristics:

Input Signal Level 1 Vp-p.
Input Impedance 75 Ohms terminated.
Return loss >46 dB to 4.3 MHz.
Number of Inputs 1.
Input Connectors BNC.

Transfer Characteristics:

Overall Gain Unity

Frequency Response ± 0.1 dB to 10 MHz (0.5V p-p Sweep Signal)

Differential Gain <0.2% (10-90% APL) at 4.43 MHz
Differential Phase <0.2 degrees (10-90% APL) at 4.43 MHz
Crosstalk <65 dB to 4.43 MHz

Video output characteristics:

Output signal level 1 Vp-p
Number of outputs 2
Output impedance 75 Ohms
Isolation >36 dB to 4.3 MHz
Noise at the outputs 70 dB below 1V p-p
Output connectors BNC.

Control inputs/outputs:

Switching time During the vertical interval. Timing is derived from the output video
Type 4/5 bit parallel TTL level signal compatible with IRT VA-400 video

switcher tally output circuit and IRT 3000 series switchers.

Number 1 “input” & 1 “output”.
Connectors 25 pin 'D' - female.

Power requirements: 110, 130, 220 / 240 Vac 50 / 60 Hz 10 VA.

Fuse rating: 240 Vac 250 mA slow blow.
110 Vac 500 mA slow blow.

Other:

Temperature range 0 - 50° C ambient
Mechanical IRT 19" rack chassis with input, output and power connections on the

rear panel.

Finish: Front panel Grey enamel, silk screened black lettering & red IRT logo
Rear panel Silk screened bright passivated steel, silk screened black lettering.

Dimensions 44 mm x 480 mm x 230 mm.

Supplied accessories Matching connectors for control inputs / outputs.

Optional accessories Instruction manual

CPS-1210 10 button local control panel kit.
CPS-1220 20 button local control panel kit.
CPS-1050 10 button remote control panel.
CPS-1052 20 button remote control panel.
GDW-1050 10 way HE14 to D25 male adapter cable to connect remote

panel to switcher.

Due to our policy of continuing development, these specifications are subject to change without notice.

AVS-1210

I.R.T.

Communications

Pty Ltd | www.irtcommunications.com

Revision 06

TECHNICAL DESCRIPTION

See wiring diagram 804341.

The AVS-1210 comprises a single printed circuit board mounted in a 1 RU chassis.
Where local control switches are fitted, these are mounted on separate boards behind the front panel. A technical
discussion of these control boards and the data protocol employed may be found in the CPS-1050 / CPS-1052 /
CPS-1210 / CPS-1220 control panel manual.

AVS-1210 chassis wiring:

Chassis wiring for the AVS-1210 is shown on Dwg 804341.

The input fuse is located inside the IEC power connector socket and should be as follows:

240 Vac 250 mA slow blow.

110 Vac 500 mA slow blow.
A voltage selector switch on the rear of the unit allows for 110, 130, 220 or 240 Vac operation by selecting a
combination of primary windings on the power transformer.
Power on indication is via a neon indicator built into the power switch on the front panel. The brightness of this
neon indicator will therefore vary according to the mains input voltage.
The two secondary low voltage windings from the transformer are wired in a centre-tap configuration to provide
raw low voltage AC to the DC power supply located on the video PCB.

Video PCB:

(Refer to drawing 804338 sheets 1 & 2.)

Power supply

The power supply section consists of a bridge rectifier (D 1 - 4) and two 3 terminal regulators providing regulated +
and -10 Vdc supply lines.

Video circuit

The Video inputs are directed to one of three Gennum GX4314 4 x 1 multiplexing IC’s (U 1, U2 & U 3).

According to Gennum, “the GX4314 is a wideband video multiplexer characterised by excellent differential phase
and gain in the enabled state, very high off-isolation in the disabled state and fully buffered unilateral signal path.
Make-before-break switching assures virtually glitch-free switching.
For use in N x M routing matrices, the GX4314 features very high, nearly constant input impedance coupled with
high output impedance in the disabled state. This allows multiple devices to be paralleled at the inputs and outputs
without additional circuitry.”
For additional information see Gennum data sheet for this device.

The use of three multiplexers allows for a maximum of 12 inputs. The 11th and 12th inputs are tied together and
used as an expansion input for forming switchers greater than 10 x 1.

The output of the three multiplexers is buffered to two outputs by video amplifier U 4. RV 3 is included to provide
trim of DC offset at the output and RV 1 provides limited gain adjustment to ensure a 1:1 transfer characteristic for
the switcher overall.

Synch circuit

The switchers may be operated in either a local or remote sync mode in order to allow simultaneous switching of
different signals in multilevel applications.
This implies that the matrix will not switch until a sync pulse is received. When this is not provided externally, a
local sync needs to be provided.

A sample of the video output signal is taken to a video synch separator IC (U 5). The vertical synch output is then
further processed by monostables U 6a & U 6b to produce a suitably timed signal to synchronise switching to the
vertical interval. RV 2 is included to generate a latch pulse timed to fall approximately 10 lines into the field period
of the video signal.

The “localsync” signal is passed to the PLA via link LK 4, which allows a choice of internal or external sync to the
switcher logic. The chosen sync is echoed to “vertout” which is available on the PL 5 remote connector for slaving
other switchers. See Configuration section for details.