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>  Msg  : 58 of 64
>  From : Alex Fokin                          2:5063/59.1     07 Jan 99  11:14:48
>  To   : All                                                 08 Jan 99  10:09:46
>  Subj : CЕЛpЕФ 300 НЕФpПЧ
> ЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂЂ
> рpЙЧЕФУФЧХА чБУ, All!!!
> 
> уХФШ ЙЪНЕОЕОЙС УПУФПЙФ Ч ПФРБКЛЕ ЧЩЧ. 16 ПФ РМБФЩ Й РpЙРБКЛЕ
> ПФ ЧЩЧ. 16 ДП ЧЩЧ. 10 r1 Й ПФ ЧЩЧ.16 ДП ЧЩЧ. 13 r2 :
> 
> 
> --+ 10
>   |-------------*------+
>   |             |      |
>   | 14          |      *
> D |--------+----(-----(o)    coax
> P | 15     |    |
> 8 |---|<---+    |
> 3 |             р r1
> 9 | 16          |
> 2 |-------------+           
>   |             |
>   |             р r2
>   | 13          |
>   |-------------+  
>   |               
> --+
> 
> r1 - 150       r2 - 20k
> 
> ч 3уПНБИ УФБЧСФ 16R2 Й 1Л
> 
> ч ЛЙФБКУЛЙИ ЛБpФБИ r1 pБЧЕО 0 (РЕpЕНЩЮЛБ), Б r2 ПФУХФУФЧХЕФ
> лУФБФЙ, ОЕ ФПМШЛП 3УПН-Щ ЗБpБОФЙpХАФ 300 Н. чПФ МЕЦЙФ SMC, ФБ ЦЕ ЛБpФЙОБ,
> pЕЪЙУФПpЩ РpБЧДБ 1Л3 Й 10Л
> 
> ч ЬФПН Й УПУФПЙФ УЕЛpЕФ 300Н.
> 
> йУФПЮОЙЛ - an-621.pdf ЖЙpНЩ National
> 
> === Cut ===
> Designing the DP8392 for
> Longer Cable Applications
> 
> The IEEE 802.3 standard is designed for 500 meters of
> Ethernet cable and 185 meters of Cheapernet (RG58A/U)
> cable. To extend such segments to 1000 meters of Ethernet
> cable and 300 meters of Cheapernet cable requires utiliza-
> tion of Transmit mode collision detection. This method is
> described below.
> COLLISION DETECTION SCHEMES
> The collision circuitry monitors the coaxial DC level. If the
> level is more negative than the collision threshold, the colli-
> sion output is enabled.
> There are two different collision detection schemes that can
> be implemented with the CTI; Receive mode, and Transmit
> mode. The IEEE 802.3 standard allows the use of receive
> and transmit modes for non-repeater node applications. Re-
> peaters are required to have to receive mode implementa-
> tion. These different modes are defined as follows:
> Receive Mode: Detects a collision between any two sta-
> tions on the network with certainty at all times.
> Transmit Mode: Detects a collision with certainty only
> when the station is transmitting.
> Table I summarizes the receive and transmit mode defini-
> Receive Mode: The Receive mode scheme has a very sim-
> ple truth table. However, the tight threshold limits make the
> design of it difficult. The threshold in this case has to be
> between the maximum DC level of one station (-1300 mV)
> and the minimum DC level of two far stations (-1581 mV).
> Several factors such as the termination resistor variation,
> signal skew, and input bias current of non-transmitting
> nodes contribute to this tight margin. On top of the
> -1300 mV minimum level, the impulse response of the in-
> ternal low pass filter has to be added. The CTI incorporates
> a 4-pole Bessel filter in combination with a trimmed on
> board bandgap reference to provide this mode of collision
> detection.
> Transmit Mode: In this case, collision has to be detected
> only when the station is transmitting. Thus, collision caused
> by two other nodes may or may not be detected. This fea-
> ture relaxes the upper limit of the threshold. As a result of
> this, longer cable segments can be used. With the CTI, a
> resistor divider can be used at the Collision Detection Sense
> (CDS) pin to lower the threshold from receive to transmit
> mode.
> 
> 
> === Cut ===
> 
> рpЙСФОП ВЩМП РППВЭБФШУС.
> дП ЧУФpЕЮЙ Ч pЕБМШОПН НЙpЕ, All
>                                                +->    icq: 17940550     |
>                                                |    AlexFokin@Usa.net <-+
> ---
>  * Origin: дМЙООПЫЕЕЕ :) (Fidonet 2:5063/59.1)
> 
> чПФ ФБЛПЕ РЙУШНП... нПЦЕФ РПРТПВХЕЫШ? ;)

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