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VDM Series - Solid State Video, RF or Balanced Line Switching Systems

CYTEC’s VDM Series Switching Systems are based on a solid state switch fabric and are available in nonblocking, full fan-out configurations from 8×8 to 32×32, with a small signal bandpass to over 400 MHz. Input and output buffers are added to the basic switch fabric allowing a broad range of both 75 and 50 ohm coaxial or two-wire signals to be switched. LAN, RS232 and
IEEE488 interfaces are standard.

TYPICAL APPLICATIONS INCLUDE:

Programmable Routing of T3/DS3, Video or Low Level
RF (Antenna Downlink, IF, etc).
Broadcast Video to Multiple Locations.
Signal Distribution for Communications and Test.
Automated Patch Panels

VDM 32x32 Chassis

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The VDM Chassis are standard 19″ rack mount with RS232, IEEE488 and Ethernet Controls. These solid state systems
are nonblocking and full fanout: any input connects to any or even all outputs. BNC or SMA Input and Output connectors are standard on the required input and output buffers. Small signal bandpass is DC to over 400 MHz, while crosstalk is better than -60 dB at 50 MHz.

ENVIRONMENTAL

Dimensions: 19′ rack mount x 5.25″ H x 15.6″ D
Weight: 20 lbs. max. with buffers installed
Operating Temperature: 0° to 65°C
Storage Temperature: -25° to 80°C
Altitude, Operational: 3,000 meters
Altitude, Storage: 15,000 meters

POWER

AC Input: 90-264 Volts AC, 47-63 Hz
DC Supply Type: High Efficiency Switching
Consumption: 250 Watts Maximum for 32×32 Matrix

BANDPASS

Small Signal: Approx. 500 MHz (-3dB) for 0 dBm
Flatness: 0.5 dB at 0 – 300 MHz
Slew Rate: 1800 V/usec

CROSSTALK / ISOLATION

Crosstalk: -50 dB at 240 MHz; -60 dB at 240 MHz Non Adjacent
Isolation: -40 dB at 360 MHz; -50 dB at 360 MHz Non Adjacent

MISCELLANEOUS

Switching Speed 100 ns plus any computer delay

Input and Output Buffers

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Input and output buffers are needed to complete the system. Standard buffers are 8 channels and are available with either 50 ohm or 75 ohm impedance and SMA or BNC connectors. A complete system requires four input and four output buffers. These buffers serve up to three different purposes:

They transform impedances to allow the solid state switch fabric to be used for signals requiring other than two wire analog, for example 50 ohm coax.
Input Buffers can be used to reduce signals to levels where they can be safely switched by the matrix.
Output Buffers can have preset gains to boost signals to required voltages.
A typical Output buffer is shown schematically in Fig. 2. Resistors Rs and Ri set the input impedance and also attenuate the input signal (if needed), while Rout determines the output impedance. The circuit is typically built with one of several standard small signal Op Amps, but custom amplifiers are also possible. Specifications for a typical small signal amplifier are shown below.

BUFFER SPECIFICATIONS

Bandpass (-3dB): Typically>500 MHz
Preset Gains (Av): 2 to 16
Output Current: 80 mA typical
Rise Time: 3100 V/us typical

VDX Series - Video and RF Switching Systems

CYTEC’s VDX Series of Video and RF Switching Systems are based on a solid state switch fabric and are available in nonblocking, full fan-out configurations of 16×16 and 32×32, with bandpass to 200 MHz. Input and output buffers can be added to the basic switch fabric allowing a broad range of both 75 and 50 ohm impedance signals to be switched. Control options include RS232, LAN and GPIB. A Manual Control Keypad option is available.

TYPICAL APPLICATIONS INCLUDE:

Programmable Routing of T3/DS3, Video or Low Level RF (Antenna Downlink, IF, etc).
Broadcast Video to Multiple Locations.
Signal Distribution for Communications and Test.
Automated Patch Panels.

VDX Series Chassis

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VDX/16x16 Mainframe

This Chassis consists of a single ended Solid State 16×16 Matrix that routes 50 or75 ohm signals up to 200 MHz in a nonblocking (any input to any output) and full fan-out (one input to several or all outputs) configuration. The basic 75 ohm, small signal (<2Vpp) system holds the necessary power supplies and the switch matrix module. Input and output buffers are added for 50 ohm or large signal (<4Vpp) systems. All systems are sold complete with any required input and output modules and LAN, RS232 or optional GPIB Controls. Manual Control is also available as an option.

Dimensions: 3.5″ high and 15.6″ depth.

VDX/32x32 Mainframe

This Chassis is a nonblocking, full fan-out solid state matrix. Crosstalk is less than -60dB at 10MHz and Bandpass is DC to 180 MHz(-3 dB). Typical applications include 75 ohm Video or DS3/T3 Switching. Similar to the VDX/16×16 Mainframe the basic 75 ohm, small signal (<2Vpp) system holds the necessary power supplies and the switch matrix module. Input and output buffers are added for 50 ohm or large signal (<4Vpp) systems. All systems are sold complete with any required input and output modules and LAN, RS232 or optional GPIB Controls. Manual Control is also available as an option.

Dimensions: 5.25″ high and 15.6″ depth.

ENVIRONMENTAL

Operating Temperature: 0° to 70°C
Storage Temperature: -25° to 80°C
Humidity: 95% RH noncondensing to 30°C

MISCELLANEOUS

Switching Speed 50 ns plus any computer delay

POWER

AC Input: Selectable 100-130 or 200-240 Volts AC, 50-60 Hz
DC Supply Type: Low Noise Linear
Consumption: 150 Watts Maximum for 32×32 Matrix

BANDPASS

Small Signal: 200 MHz (-3dB) for 200 mVpp
Flatness: 0.1dB at 60 MHz
Large Signal: 80 MHz (-2dB) for 2.0 Vpp
Flatness: 0.1 dB at 45 MHz
Slew Rate: 0.375 V/ns

CROSSTALK / ISOLATION

Crosstalk: -50 dB at 5 MHz; -60 dB at 10 MHz Non Adjacent; -46 dB at 10 MHz Adjacent Channels
Isolation: -95 dB at 10 MHz

BUFFER SPECIFICATIONS

Bandpass (<2Vpp) (-3dB): 175 MHz
Bandpass (<4Vpp) (-3dB): 165 MHz
Preset Gains (Av): 2 to 16
Output Current: 70 mA typical
Rise Time: .375 V/ns typical