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DX Series - Solid State Digital Switching Systems

CYTEC’s DX/256×256 Series Switching Systems are based on a solid state switch fabric. The Standard DX system is designed to switch:

  •  Differential RS422 to 25 Mbps
  •  75 ohm TTL to 50 Mbps with input and output protection .
  •  TTL, CMOS, LVTTL, and RS232. 
  • Non-blocking and full fan-out means any input to any or all outputs.
  • Configurations from 64×64 up to 256×256 or Dual 32×32 to 128×128 (Clock and Data). 
  • Control options include LAN, RS232, GPIB or USB and optional Manual Keypad.
Download DX Product Bulletin here (pdf Bulletin)

Table of Contents

DX/256x256 Matrices

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DX/256×256-MF

The Standard Mainframes are built with power supplies,  Control Module and optional Keypad LCD Display Manual Control. The system is completely modular by adding the desired number of DX/64 Input and Output Buffer Modules.

These Chassis provide a non-blocking, full fan-out matrix in any configuration from 64×64 to 256×256. The standard chassis switches differential RS422 up to 20 Mbps or single ended TTL data up to 40 Mbps. Custom buffer modules allow for single ended 75 ohm TTL signals up to 80 Mbps. Systems may be configured as dual 128×128 for Clock and Data signals. D78 connectors are standard and may be taken out to patch panels for almost any other connector such as BNC, Twinax, Triax or other D types. 75 ohm TTL systems are patched to 75 ohm BNC’s.

Dimensions:
19″ Rack Mount (483 mm)
20″ deep (500 mm)
7″ to 14″ high (2 to 4 RU) high (180 to 360 mm) Depending on what buffer modules are installed.
Weight: 25 to 35 lbs (11 to 16 Kg) max
AC Power : 50 to 250 Watts max. 110/220 selectable.

DX/256×256-MF-S

Cytec makes a special version of this system for 75 ohm TTL signals. Applications include military and aerospace radar, video, PCM signals and any other systems using 75 ohm TTL levels.
Features Include:
  •  75 ohm TTL Data rates to 80 Mbps NRZ.
  • Input overvoltage protection to +/- 15 volts. • Output short circuit protection.
  • 75 ohm output drivers capable of running full TTL levels down 200′ of coax cable.
  •  Separate controller option with redundant control modules.
  •  Rack Mount power supply with redundant, hot swap power supply modules.
  • 75 ohm BNC Patch Panels
  • Completely non-blocking and full fan-out. Any input to any or all outputs.

DX/256x256 Input and Output Buffers

Optional Input and/or output buffer modules convert the system to RS-422, 75 Ohm TTL and/or RS-232 levels. Each buffer module has sixty-four (64) channels so a fully buffered 256×256 system has four input buffers and four output buffers. When these modules are used, the specifications of the system are determined by the input and/ or output buffers present. The RS-422 input and output buffer modules have two options for connectors, 68 pin male header or 78 pin female “D” connector.

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Specifications
RS-232 Input Buffer Characteristic:
  • Input Voltage Range -25V Min /+25V Max
  • Input Voltage High (VIH) 2.17V Min
  • Input Voltage Low (VIL) 1.06V Max
  • Data Rate 200 kb/s Typical
  • Input Resistance 5.0k Ohms Typical
RS-232 Output Buffer Characteristic:
  • Output Voltage High (VOH) +5V Min /+8V Max
  • Output voltage Low (VOL) -8V Typical /-5V Max
  • Data Rate 120 kb/s Typical
  • Output Current ±10mA Typical
RS-422 Input Buffer Characteristic:
  • Common Mode Input Voltage (Vcm) -7V — Vcm — +7V
  • Differential Voltage Swing 200 mV Min
  • Input Resistance 6.8 KOhm Typical
  • Data Rate 20 Mb/s Max
RS-422 Output Buffer Characteristic:
  • Common Mode Output Voltage 1.8V Typical
  • Output Voltage High (VOH) 2.5V Min /3.4V Max
  • Output Voltage Low (VOL) .3V Typical /.5V Max
  • Data Rate 20 Mb/s Max
  • Output Current 150 mA Max
75 Ohm TTL Input Buffer Specifications:
  • TTL Low 0.8 V Max
  • TTL High 2.0 V Min
  • Maximum Input without damage:
    +15 V not continuous for long duration.
    +8.5 V continuous long term.
    -15 V not continuous for long duration.
75 Ohm TTL Output Buffer Specifications:
Output Buffer Specifications: At Patch Panel
  • TTL High — — + 4.8V
  • TTL Low — — 200 mV
  • Maximum output current — — 133 mA
  • Maximum output voltage — — 5.2 V
  • Maximum Output frequency — — 40 MHz (80 Mbps NRZ)
  • Rise time into 75 ohm load 2.65 nS
Output Buffer Specifications: At end of 200′ cable
  • TTL High — — + 4.4V
  • TTL Low — — 500 mV
  • Maximum output current — — 133 mA
  • Maximum output voltage — — 5.2 V
  • Maximum Output frequency — — 35 MHz (70 Mbps NRZ)
  • Rise time into 75 ohm load 7.0 nS

DX/256x256 Patch Panels

Standard Patch Panels are available to convert D connectors to BNC, SMA, Triax or other common connectors if needed.

32 channel BNC patch panel (2 RU) Note: this is 4 PP-D37-16-BNC mounted to a larger panel

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