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--- de:signals:scsi_termination [2011/09/06 22:19] – angelegt MWanke
+++ de:signals:scsi_termination [2013/03/24 05:19] (aktuell) – Externe Bearbeitung 127.0.0.1
@@ Zeile 1: / Zeile 1: @@
 {{  :status_10.gif|10%}}
-====== Scsi Termination ======
+====== SCSI Termination ======
 {{:de:baustelle.gif|Baustelle}}
@@ Zeile 15: / Zeile 15: @@
-{{:de:signals:hw-84_1.jpg|}}
+{{:de:signals:hw_84_1.jpg|}}
 ====== passiver Terminator ======
-{{:de:signals:scsi-passiv-network.png|}}
+{{:de:signals:scsi_passiv_network.png|}}
+====== noch'n Text ======
+Termination can be passive or active. Passive termination means that each signal line is terminated by two resistors, 220 Ω to TERMPOWER and 330 Ω to ground. Active termination means that there is a small voltage regulator which provides a +3.3 V supply. Each signal line is then terminated by a 110 Ω resistor to the +3.3 V supply. Active termination provides a better impedance match than passive termination because most flat ribbon cables have a characteristic impedance of approximately 110 Ω. Forced perfect (FPT) termination is similar to active termination, but with added diode clamp circuits which absorb any residual voltage overshoot or undershoot. There is a special case in SCSI systems that have mixed 8-bit and 16-bit devices where high-byte termination may be required.
+In current practice most parallel SCSI buses are LVD and so require external, active termination. The usual termination circuit consists of a +3.3 V linear regulator and commercially available SCSI resistor network devices (not individual resistors).
+====== Aufforderung ======
-{{:de:signals:scsi-netzwerk.pdf|}}
+Wer will verfeinern ? ... erweitern ??
 \\
@@ Zeile 28: / Zeile 37: @@
   * zu Dokumentationen
   * http://www.hardwareecke.de/berichte/schnittstellen/scsi_8.php
+  * Datenblatt: {{:de:signals:scsi_network.pdf|}} (60kB)

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