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Source for VMEbus, PMC Modules, CompactPCI, Single Board Computers, Rackmount Servers, and Rackmount Chassis
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(JBOD, or "Just a Bunch of Drives") A storage subsystems using multiple independent disk drives, as opposed to one form of RAID or another.


DSTN is a passive matrix LCD technology. DSTN uses two layers to counteract the color shifting that happens with conventional supertwist displays. The passive matrix screen has transistors running down the x and y axes of two sides of the screen. The number of transistors determines the screen's resolution. At the intersection of each grid is a LCD element which constitutes a single pixel, either letting light through or blocking it.



Q. What is LVDS?
A. LVDS is short for "Low Voltage Differential Signaling" and is a high speed, low power data transmission standard.

Q. Is there an LVDS standard?
A. YES, LVDS is standardized in the ANSI/TIA/EIA-644-1995 Electrical characteristics standard titled: "Electrical Characteristics of Low Voltage Differential Signaling (LVDS) Interface Circuits"

Q. How can I obtain a copy of the LVDS standard?
A. Copies of standards are available for purchase from Global Engineering Documents at

Q. What is defined in the ANSI/TIA/EIA-644 standard?
A. The LVDS standard is an electrical standard only defining driver output characteristics and receiver input characteristics. Guideline are also given on bus configuration, cables, and termination. Protocol, connectors, and bus structure is not defined in this standard, as they are application dependant. It is intended that these parameters are specified by the referencing standard.

Q. How fast is LVDS?
A. LVDS is envisioned to be forward looking and does not define a maximum data rate within the standard. As maximum data rate is design, technology, and application dependant (required signal quality). Current LVDS parts operate from DC to Giga bits per second range.

Q. How far can LVDS go?
A. LVDS is a short haul interface envisioned to drive interconnects of a few inches to 10's of meters. Once again this is application specific depending upon the LVDS device employed and the required signal quality.

Q. Is LVDS low Power?
A. YES. Power dissipation is minimized in a number of ways. This includes the CMOS process, the current mode driver design, and also the small load current.

Q. Is LVDS low noise?
A. YES. Noise generation is minimized in a number of ways. The signal swing is only 300mV, and also a true balanced differential data transmission scheme, and the current mode driver all limit noise generation.

Q. Does LVDS require a termination resistor?
A. YES, for two reasons. Since the drivers are current mode, the resistor is required to complete the current loop. Also, since LVDS features sub-nanosecond transition times, the interconnect will be a transmission line, and a termination is required to limit reflections.

Q. Is LVDS for point-to-point applications only?
A. NO. Multi-point applications are supported with the Bus LVDS (BLVDS) family, while standard LVDS parts support point-to-point and multi-drop applications.

Q. What is the common mode range for LVDS devices.?
A. The common-mode range is +/-1V around the driver offset voltage (+1.25V typical). This supports the input operating range of GND to +2.4V on the receivers. Always use a balanced media and closely-coupled traces to obtain the maximum common mode rejection.

Q. How much noise margin does LVDS provide?
A. This is related to the +/-1V common mode range of LVDS. Since noise will be coupled as common-mode, the receivers will reject it. LVDS provides more than twice the noise margin of reduced swing single-ended technologies (BTL and GTL+).

Riser Card

riser card

A riser card is normally used in a low profile case. Instead of the cards being perpendicular to the board, a riser card is used to make them parallel to the board, saving on the height. The riser card (short) is inserted to the mainboard perpendicular and the the others are inserted into the riser parallel to the main board.


thin-film transistor

A technology for building the LCD screens that are commonly found on laptop computers. TFT screens are brighter and more readable than dual-scan LCD screens, but consume more power and are generally more expensive.

VME or VMEbus

VME or VMEbus or VersaModule Eurocard bus. This is a 32-bit bus developed by motorola, signetics, mostek and thompson csf. It is widely used in industrial, commercial and military applications with over 300 manufacturers of vme products worldwide. Vme64 is an expanded version that provides 64-bit data transfer and addressing.

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VoxTechnologies Corp. - Industrial Computer Leader
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For over a decade, VoxTechnologies has been a leading source of industrial computers and complete system products for the O.E.M. and Systems Integrator. Our primary goal is to provide a solution source for engineers that have the challenging task of interfacing and controlling the real world.

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Last modified: November 30, 2002   Proud Sponsor of Dallas Jazz