{"id":271,"date":"2020-08-18T19:23:47","date_gmt":"2020-08-18T20:23:47","guid":{"rendered":"http:\/\/www.linux-tutorial.info\/?page_id=77"},"modified":"2020-08-22T19:26:39","modified_gmt":"2020-08-22T20:26:39","slug":"this-is-the-page-title-toplevel-106","status":"publish","type":"page","link":"http:\/\/www.linux-tutorial.info\/?page_id=271","title":{"rendered":"Termination"},"content":{"rendered":"\n<title>Termination<\/title>\n<p>\nWith Ultra <glossary>SCSI<\/glossary>,\ntermination plays a more important role. A steeper edge means that the\nreflection has  a stronger effect  than with Fast SCSI. Moreover, a faster cycle\nmeans that the <glossary>bus<\/glossary> is more sensitive to interference. In\nprinciple, SCSI termination, even with Ultra SCSI, is simple: both ends of the\nbus (that is, the <i>physical<\/i> ends of the bus) must be terminated.\n<\/p>\n<p>\nIf you have fewer devices than connectors on your <glossary>SCSI<\/glossary>\ncable, I advise you to connect devices at both ends of the cable, terminating\nboth  of them. Loose ends can  definitely lead to problems with reflection. By\nhaving devices at the physical ends of the cable, there is no question which\ndevice is at the end of the <glossary>bus<\/glossary>.  Keep in mind that the\norder of the devices on the bus is independent of this.\n<\/p>\n<p>\nYou run into problems when the device has no possibility of being terminated\nor functions only with passive  termination. Although no termination is rarely\nfound, many (especially older) devices support only passive termination. Such\ndevices include a lot of CD-ROMS and tape drives. Read the hardware\ndocumentation to find out what type of termination your drive supports or\ncontact the manufacturer before you purchase the drive.\n<\/p>\n<p>\nYou need to be careful with some hard disks. There is often a jumper labeled\nTERM, which does not enable\/disable the termination, but rather enables\/disables\nthe power for the active termination.\n<\/p>\n<p>\nIf you do have a device with active termination, this device belongs  at one\nend of the <glossary>SCSI<\/glossary> cable. The other end is usually the\n<glossary>host<\/glossary> adapter. <glossary>PCI<\/glossary>\nhost adapters are almost exclusively produced with active termination.\n<\/p>\n<p>\nIf both external and internal devices are present, the\n<glossary>host<\/glossary> adapter must not be terminated because it is now in\nthe middle of the <glossary>bus<\/glossary> and no longer at the end. The\ntermination is now on the device at the end of the other cable. Note that\nolder, 50-pin Centronics connectors are almost exclusively passive terminators.\nTherefore, if you replace your existing <glossary>host adapter<\/glossary> with\nan Ultra-SCSI adaptor, you really should change the termination to active.\n<\/p>\n<p>\nWide <glossary>SCSI<\/glossary>\npresents its own termination and cabling problems. On most Wide-SCSI\n<glossary>host<\/glossary> adapters, you&#8217;ll find an 8-bit and 16-bit connector,\nboth of which you can use. However, keep in mind that <i>both<\/i> must be\nterminated.\n<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Termination With Ultra SCSI, termination plays a more important role. A steeper edge means that the reflection has a stronger effect than with Fast SCSI. Moreover, a faster cycle means that the bus is more sensitive to interference. In principle, &hellip; <a href=\"http:\/\/www.linux-tutorial.info\/?page_id=271\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-271","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"http:\/\/www.linux-tutorial.info\/index.php?rest_route=\/wp\/v2\/pages\/271","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.linux-tutorial.info\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/www.linux-tutorial.info\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/www.linux-tutorial.info\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.linux-tutorial.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=271"}],"version-history":[{"count":1,"href":"http:\/\/www.linux-tutorial.info\/index.php?rest_route=\/wp\/v2\/pages\/271\/revisions"}],"predecessor-version":[{"id":731,"href":"http:\/\/www.linux-tutorial.info\/index.php?rest_route=\/wp\/v2\/pages\/271\/revisions\/731"}],"wp:attachment":[{"href":"http:\/\/www.linux-tutorial.info\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=271"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}