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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by tsikscar[/i] [br]Can someone help me with the symbols shown in the attached circuit, arrowed 1 and 2. i thought one of them was a symbol for twisted pair. I am not sure of the dashed circle with the arrowed connections on the group of cables. Are the components on the left opto-isolators? It's better to admit you don't know than to remain ignorant. Also what sources can i use to get the meanings of such symbols. Thanks. [b]Download Attachment:[/b] [url="./uploaded/tsikscar/2013620163918_MCM.png"][img]./icon_paperclip.gif[/img] MCM.png[/url][br]115.05 KB [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.