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`H4000 ETHERNET TRANSCEIVER
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`Technical Manual
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`distributed
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`mnannan
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`Copyright © 1982 by Digital Equipment Corporation
`
`All Rights Reserved
`
`The material in this manual is for informational purposes and is subject
`to change without notice.
`
`Digital Equipment Corporation assumes no responsibility for any errors
`which may appear in this manual.
`
`Printed in U.S.A.
`
`The following are trademarks of Digital Equipment Corporation.
`Maynard, Massachusetts:
`
`DIGITAL
`DEC
`PDP
`DECUS
`UNIBUS
`
`DECsystem~1D
`DECSYSTEMVZO
`DIBOL
`EDUSYSTEM
`VAX
`VMS
`
`MASSBUS
`OMNIBUS
`OS/8
`RSTS
`RSX
`IAS
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`200
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`400
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`500
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`800
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`TIME I,uSECI
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`SURGE CURRENT"
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`25
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`20
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`15
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`IO
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`5 0
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`CURRENT IAMPERESI
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`STEADY STATE CURRENT ' “
`
`CURRENT IMILLI AIVIPERESI
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`340
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`330
`320 ’§\./‘\Z'T_/
`3IU
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`300
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`‘I2
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`16
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`TIME I_uSECI
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`‘ SURGE CURRENT WAVEFORM DERIVED FROM
`INSTANTANEOUS ASSERTION OF +12 Vdc TO
`POWER PAIR FROM A LOW IMPEDANCE SOURCE,
`WITHOUT AN EXTERNAL SURGE LIMITING CIRCUIT.
`
`‘ ‘ STEADY STATE CURRENT WAVE FORM FOR +12 Vdc INPUT
`TO POWER PAIR.
`
`TK-Er:-—
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`Flgure 2-5: Surge and Steady State Current Waveforms: Power Pair
`
`2.6 Transmit Pair
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`2.6.1 Drive Circuit Requirements
`
`the transmit pair of the transceiver cable must. be driven zi-
`
`To transmit,
`follows:
`
`' Pins:
`
`TRANSMIT (+)
`TRANSMIT I-I
`
`Pin 3
`Pin 10
`
`0 Drive Levels: +/-550 rnV minimurn, +/-1.2 V maximum
`
`0 Source Impedance of driver: > 415 Ohms
`
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`Circuit Description
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`3—25
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