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Related Manuals for Systran SCRAMNet GT200
Summary of Contents for Systran SCRAMNet GT200
- Page 1 SCRAMNet Network Skew Meter Owner’s Manual Document No. D-T-MU-SKEWMTR#-A-0-A2...
- Page 3 SYSTRAN reserves the right to make changes without notice. SYSTRAN makes no warranty of any kind with regard to this printed material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
- Page 4 This product is intended for use in industrial, laboratory or military environments. This product uses and emits electromagnetic radiation which may interfere with other radio and communication devices. The user may be in violation of FCC regulations if this device is used in other than the intended market environments.
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Page 5: Table Of Contents
TABLE OF CONTENTS 1.0 INTRODUCTION ........................1 1.1 Overview ........................1 1.2 Features.........................1 1.3 Technical Support......................1 1.4 Reliability ........................1 1.5 Related Documentation ....................2 1.6 Ordering Process......................3 2.0 DESCRIPTION .........................5 2.1 Overview ........................5 2.2 Connections ........................5 2.3 Controls ........................5 2.4 Indicators ........................6 3.0 OPERATION..........................7 3.1 Single-meter operation....................7 3.2 Two-meter operation ....................8 3.3 Notes on Operation.......................9... - Page 6 TABLE OF CONTENTS This page intentionally left blank Copyright 1998 SCRAMNet Skew Meter...
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Page 7: Introduction
Direct any programming questions, any concerns about the functionality of this meter for your particular application, or any questions not answered satisfactorily by this document, to the factory by phone, or send an E-mail message to support@systran.com. 1.4 Reliability SYSTRAN corporate policy is to provide the highest quality products in support of customer needs. -
Page 8: Related Documentation
SYSTRAN’s quality system was assessed by BSI QA, which is the certification division of British Standards Institution, the largest and most respected standardization authority in the world. SYSTRAN’s quality system was found to meet or to exceed the international standards in all areas, and Certificate of Registration number FM 31468 was issued to SYSTRAN on May 16, 1995. -
Page 9: Ordering Process
INTRODUCTION 1.6 Ordering Process To learn more about SYSTRAN products or about custom-designed boards, or to place an order, the following contacts are available: • Phone: (937) 252-5601 • E-mail address: info@systran.com • World Wide Web address: http://www.systran.com Copyright 1998... - Page 10 INTRODUCTION This page intentionally left blank Copyright 1998 SCRAMNet Skew Meter...
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Page 11: Description
2.0 DESCRIPTION 2.1 Overview The Skew Meter measures the skew of a paired-conductors SCRAMNet cable by generating two signals with a known phase relationship and driving them into one end of the cable. At the other end of the cable the two signals are compared and the change in the phase relationship is used to determine the propagation skew between the two elements of the pair. -
Page 12: Indicators
DESCRIPTION 2.4 Indicators Two green LEDs near the RXA and RXB inputs indicate that a signal is detected at the associated input. A yellow “SWAP” LED indicates that the conductor pair is cross-connected so that TXA drives RXB and TXB drives RXA. If this light is on the connections should be swapped at one end so that the meter correctly indicates which conductor is shorter. -
Page 13: Operation
3.0 OPERATION 3.1 Single-meter operation To measure the skew in a cable when both ends of the cable can be plugged into the same Skew Meter, perform the following steps: 1. Apply power to the meter with the supply that came with the meter or from some alternative source. -
Page 14: Two-Meter Operation
OPERATIONS 3.2 Two-meter operation If the ends of the cable are physically separated and can’t be plugged into a single skew meter, the skew of the pair can still be measured by using two skew meters, one as a transmitter and one as a receiver. Measure the offset between the two meters first. -
Page 15: Notes On Operation
OPERATIONS TXA TXB RXA RXB TXA TXB RXA RXB Meter 1 Meter 2 Figure 3-2 Connecting the cables for two-meter operation NOTE: To avoid confusion, both RANGE switches must be in the same position! The RANGE switch on Meter 1 controls the actual measurement range, but the RANGE switch on Meter 2 controls the decimal point on Meter 2’s display. - Page 16 OPERATIONS This page intentionally left blank Copyright 1998 SCRAMNet Skew Meter...
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Page 17: Adjusting The Skew
The conversion from nanoseconds to length to be added or subtracted depends on the signal propagation speed of your particular cable. For many cables, including Systran’s, the propagation speed is almost exactly 20 cm/ns (7.9 in/ns). If you don’t know the propagation speed of your cable, you can measure it by inserting a short known length into one side of a cable pair and measuring how much the skew changes. -
Page 18: Table 4-2 Conversion From Nanoseconds Of Skew To Cable Length
ADJUSTING THE SKEW Table 4-2 Conversion from nanoseconds of skew to cable length Skew (ns) Length (cm) Length (in) 3.95 7.90 11.85 15.80 19.75 23.70 27.65 31.60 35.55 39.50 43.45 47.40 51.35 55.30 59.25 63.20 67.15 71.10 75.05 10.0 79.00 Copyright 1998 SCRAMNet Skew Meter... - Page 19 A. APPENDIX SPECIFICATIONS APPENDIX A SPECIFICATIONS...
- Page 21 Power connector: Hollow-center power plug, 5.5 mm o.d., 2.5 mm i.d., 9.5 mm long, Switchcraft part number 760 or equivalent. The center conductor is positive. Internal fuse: Littelfuse part number R451002 (Systran part number AHPRF125V/2AS0A1) Copyright 1998 SCRAMNet Skew Meter...
- Page 22 SPECIFICATIONS This page intentionally left blank Copyright 1998 SCRAMNet Skew Meter...
- Page 23 B. CALIBRATION PROCEDURE APPENDIX B: CALIBRATION PROCEDURE...
- Page 25 CALIBRATION PROCEDURE B.1 Calibration Procedure Calibration of the Skew Meter is normally handled at the factory; however, if necessary the meter can be calibrated as follows: 1. Apply power to the meter and allow it to warm up. 2. Find a pair of short, equal-length conductors and a single conductor with a known delay.
- Page 26 CALIBRATION PROCEDURE This page intentionally left blank Copyright 1998 SCRAMNet Skew Meter...
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