\sphinx.addnodesdocument)}( rawsourcechildren]( translations LanguagesNode)}(hhh](h pending_xref)}(hhh]docutils.nodesTextChinese (Simplified)}parenthsba attributes}(ids]classes]names]dupnames]backrefs] refdomainstdreftypedoc reftarget./translations/zh_CN/networking/arcnet-hardwaremodnameN classnameN refexplicitutagnamehhh ubh)}(hhh]hChinese (Traditional)}hh2sbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget./translations/zh_TW/networking/arcnet-hardwaremodnameN classnameN refexplicituh1hhh ubh)}(hhh]hItalian}hhFsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget./translations/it_IT/networking/arcnet-hardwaremodnameN classnameN refexplicituh1hhh ubh)}(hhh]hJapanese}hhZsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget./translations/ja_JP/networking/arcnet-hardwaremodnameN classnameN refexplicituh1hhh ubh)}(hhh]hKorean}hhnsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget./translations/ko_KR/networking/arcnet-hardwaremodnameN classnameN refexplicituh1hhh ubh)}(hhh]hPortuguese (Brazilian)}hhsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget./translations/pt_BR/networking/arcnet-hardwaremodnameN classnameN refexplicituh1hhh ubh)}(hhh]hSpanish}hhsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget./translations/sp_SP/networking/arcnet-hardwaremodnameN classnameN refexplicituh1hhh ubeh}(h]h ]h"]h$]h&]current_languageEnglishuh1h hh _documenthsourceNlineNubhcomment)}(h SPDX-License-Identifier: GPL-2.0h]h SPDX-License-Identifier: GPL-2.0}hhsbah}(h]h ]h"]h$]h&] xml:spacepreserveuh1hhhhhhH/var/lib/git/docbuild/linux/Documentation/networking/arcnet-hardware.rsthKubhsection)}(hhh](htitle)}(hARCnet Hardwareh]hARCnet Hardware}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhhhhKubh field_list)}(hhh]hfield)}(hhh](h field_name)}(hAuthorh]hAuthor}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhhKubh field_body)}(h*Avery Pennarun h]h paragraph)}(h)Avery Pennarun h](hAvery Pennarun <}(hhhhhNhNubh reference)}(hapenwarr@worldvisions.cah]hapenwarr@worldvisions.ca}(hj hhhNhNubah}(h]h ]h"]h$]h&]refurimailto:apenwarr@worldvisions.cauh1jhhubh>}(hhhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKhhubah}(h]h ]h"]h$]h&]uh1hhhubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubah}(h]h ]h"]h$]h&]uh1hhhhhhhhKubhnote)}(haThis file is a supplement to arcnet.rst. Please read that for general driver configuration help.h]h)}(haThis file is a supplement to arcnet.rst. Please read that for general driver configuration help.h]haThis file is a supplement to arcnet.rst. Please read that for general driver configuration help.}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK hj7ubah}(h]h ]h"]h$]h&]uh1j5hhhhhhhNubh)}(hXBecause so many people (myself included) seem to have obtained ARCnet cards without manuals, this file contains a quick introduction to ARCnet hardware and some cabling tips. If you have any other information, do not hesitate to :ref:`send an email to netdev `.h](hBecause so many people (myself included) seem to have obtained ARCnet cards without manuals, this file contains a quick introduction to ARCnet hardware and some cabling tips. If you have any other information, do not hesitate to }(hjOhhhNhNubh)}(h.:ref:`send an email to netdev `h]hinline)}(hjYh]hsend an email to netdev}(hj]hhhNhNubah}(h]h ](xrefstdstd-refeh"]h$]h&]uh1j[hjWubah}(h]h ]h"]h$]h&]refdocnetworking/arcnet-hardware refdomainjhreftyperef refexplicitrefwarn reftarget arcnet-netdevuh1hhhhKhjOubh.}(hjOhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh)}(hhh](h)}(hIntroduction to ARCneth]hIntroduction to ARCnet}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhKubh)}(hARCnet is a network type which works in a way similar to popular Ethernet networks but which is also different in some very important ways.h]hARCnet is a network type which works in a way similar to popular Ethernet networks but which is also different in some very important ways.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjhhubh)}(hX9First of all, you can get ARCnet cards in at least two speeds: 2.5 Mbps (slower than Ethernet) and 100 Mbps (faster than normal Ethernet). In fact, there are others as well, but these are less common. The different hardware types, as far as I'm aware, are not compatible and so you cannot wire a 100 Mbps card to a 2.5 Mbps card, and so on. From what I hear, my driver does work with 100 Mbps cards, but I haven't been able to verify this myself, since I only have the 2.5 Mbps variety. It is probably not going to saturate your 100 Mbps card. Stop complaining. :)h]hX=First of all, you can get ARCnet cards in at least two speeds: 2.5 Mbps (slower than Ethernet) and 100 Mbps (faster than normal Ethernet). In fact, there are others as well, but these are less common. The different hardware types, as far as I’m aware, are not compatible and so you cannot wire a 100 Mbps card to a 2.5 Mbps card, and so on. From what I hear, my driver does work with 100 Mbps cards, but I haven’t been able to verify this myself, since I only have the 2.5 Mbps variety. It is probably not going to saturate your 100 Mbps card. Stop complaining. :)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjhhubh)}(hZYou also cannot connect an ARCnet card to any kind of Ethernet card and expect it to work.h]hZYou also cannot connect an ARCnet card to any kind of Ethernet card and expect it to work.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK#hjhhubh)}(hXFThere are two "types" of ARCnet - STAR topology and BUS topology. This refers to how the cards are meant to be wired together. According to most available documentation, you can only connect STAR cards to STAR cards and BUS cards to BUS cards. That makes sense, right? Well, it's not quite true; see below under "Cabling."h]hXPThere are two “types” of ARCnet - STAR topology and BUS topology. This refers to how the cards are meant to be wired together. According to most available documentation, you can only connect STAR cards to STAR cards and BUS cards to BUS cards. That makes sense, right? Well, it’s not quite true; see below under “Cabling.”}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK&hjhhubh)}(hX$Once you get past these little stumbling blocks, ARCnet is actually quite a well-designed standard. It uses something called "modified token passing" which makes it completely incompatible with so-called "Token Ring" cards, but which makes transfers much more reliable than Ethernet does. In fact, ARCnet will guarantee that a packet arrives safely at the destination, and even if it can't possibly be delivered properly (ie. because of a cable break, or because the destination computer does not exist) it will at least tell the sender about it.h]hX.Once you get past these little stumbling blocks, ARCnet is actually quite a well-designed standard. It uses something called “modified token passing” which makes it completely incompatible with so-called “Token Ring” cards, but which makes transfers much more reliable than Ethernet does. In fact, ARCnet will guarantee that a packet arrives safely at the destination, and even if it can’t possibly be delivered properly (ie. because of a cable break, or because the destination computer does not exist) it will at least tell the sender about it.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK,hjhhubh)}(hBecause of the carefully defined action of the "token", it will always make a pass around the "ring" within a maximum length of time. This makes it useful for realtime networks.h]hBecause of the carefully defined action of the “token”, it will always make a pass around the “ring” within a maximum length of time. This makes it useful for realtime networks.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK5hjhhubh)}(hX In addition, all known ARCnet cards have an (almost) identical programming interface. This means that with one ARCnet driver you can support any card, whereas with Ethernet each manufacturer uses what is sometimes a completely different programming interface, leading to a lot of different, sometimes very similar, Ethernet drivers. Of course, always using the same programming interface also means that when high-performance hardware facilities like PCI bus mastering DMA appear, it's hard to take advantage of them. Let's not go into that.h]hX$In addition, all known ARCnet cards have an (almost) identical programming interface. This means that with one ARCnet driver you can support any card, whereas with Ethernet each manufacturer uses what is sometimes a completely different programming interface, leading to a lot of different, sometimes very similar, Ethernet drivers. Of course, always using the same programming interface also means that when high-performance hardware facilities like PCI bus mastering DMA appear, it’s hard to take advantage of them. Let’s not go into that.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK9hjhhubh)}(hXOne thing that makes ARCnet cards difficult to program for, however, is the limit on their packet sizes; standard ARCnet can only send packets that are up to 508 bytes in length. This is smaller than the Internet "bare minimum" of 576 bytes, let alone the Ethernet MTU of 1500. To compensate, an extra level of encapsulation is defined by RFC1201, which I call "packet splitting," that allows "virtual packets" to grow as large as 64K each, although they are generally kept down to the Ethernet-style 1500 bytes.h]hXOne thing that makes ARCnet cards difficult to program for, however, is the limit on their packet sizes; standard ARCnet can only send packets that are up to 508 bytes in length. This is smaller than the Internet “bare minimum” of 576 bytes, let alone the Ethernet MTU of 1500. To compensate, an extra level of encapsulation is defined by RFC1201, which I call “packet splitting,” that allows “virtual packets” to grow as large as 64K each, although they are generally kept down to the Ethernet-style 1500 bytes.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKBhjhhubh)}(hXFor more information on ARCnet networks, visit the "ARCNET Resource Center" WWW page at:h]h\For more information on ARCnet networks, visit the “ARCNET Resource Center” WWW page at:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKJhjhhubh block_quote)}(hhttps://www.arcnet.cc h]h)}(hhttps://www.arcnet.cch]j)}(hjh]hhttps://www.arcnet.cc}(hjhhhNhNubah}(h]h ]h"]h$]h&]refurijuh1jhjubah}(h]h ]h"]h$]h&]uh1hhhhKMhjubah}(h]h ]h"]h$]h&]uh1jhhhKMhjhhubeh}(h]introduction-to-arcnetah ]h"]introduction to arcnetah$]h&]uh1hhhhhhhhKubh)}(hhh](h)}(hCabling ARCnet Networksh]hCabling ARCnet Networks}(hjDhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjAhhhhhKQubh)}(hThis section was rewritten byh]hThis section was rewritten by}(hjRhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKShjAhhubj)}(h%Vojtech Pavlik h]h)}(h$Vojtech Pavlik h](hVojtech Pavlik <}(hjdhhhNhNubj)}(hvojtech@suse.czh]hvojtech@suse.cz}(hjlhhhNhNubah}(h]h ]h"]h$]h&]refurimailto:vojtech@suse.czuh1jhjdubh>}(hjdhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKUhj`ubah}(h]h ]h"]h$]h&]uh1jhhhKUhjAhhubh)}(h1using information from several people, including:h]h1using information from several people, including:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKWhjAhhubj)}(h- Avery Pennraun - Stephen A. Wood - John Paul Morrison - Joachim Koenig h]h bullet_list)}(hhh](h list_item)}(h-Avery Pennraun h]h)}(hjh](hAvery Pennraun <}(hjhhhNhNubj)}(hapenwarr@worldvisions.cah]hapenwarr@worldvisions.ca}(hjhhhNhNubah}(h]h ]h"]h$]h&]refurimailto:apenwarr@worldvisions.cauh1jhjubh>}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKYhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(h)Stephen A. Wood h]h)}(hjh](hStephen A. Wood <}(hjhhhNhNubj)}(hsaw@hallc1.cebaf.govh]hsaw@hallc1.cebaf.gov}(hjhhhNhNubah}(h]h ]h"]h$]h&]refurimailto:saw@hallc1.cebaf.govuh1jhjubh>}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKZhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(h0John Paul Morrison h]h)}(hjh](hJohn Paul Morrison <}(hjhhhNhNubj)}(hjmorriso@bogomips.ee.ubc.cah]hjmorriso@bogomips.ee.ubc.ca}(hjhhhNhNubah}(h]h ]h"]h$]h&]refuri"mailto:jmorriso@bogomips.ee.ubc.cauh1jhjubh>}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhK[hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(h#Joachim Koenig h]h)}(h"Joachim Koenig h](hJoachim Koenig <}(hj*hhhNhNubj)}(h jojo@repas.deh]h jojo@repas.de}(hj2hhhNhNubah}(h]h ]h"]h$]h&]refurimailto:jojo@repas.deuh1jhj*ubh>}(hj*hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhK\hj&ubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]bullet-uh1jhhhKYhjubah}(h]h ]h"]h$]h&]uh1jhhhKYhjAhhubh)}(h4and Avery touched it up a bit, at Vojtech's request.h]h6and Avery touched it up a bit, at Vojtech’s request.}(hj`hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK^hjAhhubh)}(hARCnet (the classic 2.5 Mbps version) can be connected by two different types of cabling: coax and twisted pair. The other ARCnet-type networks (100 Mbps TCNS and 320 kbps - 32 Mbps ARCnet Plus) use different types of cabling (Type1, Fiber, C1, C4, C5).h]hARCnet (the classic 2.5 Mbps version) can be connected by two different types of cabling: coax and twisted pair. The other ARCnet-type networks (100 Mbps TCNS and 320 kbps - 32 Mbps ARCnet Plus) use different types of cabling (Type1, Fiber, C1, C4, C5).}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK`hjAhhubh)}(hFor a coax network, you "should" use 93 Ohm RG-62 cable. But other cables also work fine, because ARCnet is a very stable network. I personally use 75 Ohm TV antenna cable.h]hFor a coax network, you “should” use 93 Ohm RG-62 cable. But other cables also work fine, because ARCnet is a very stable network. I personally use 75 Ohm TV antenna cable.}(hj|hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKehjAhhubh)}(hX_Cards for coax cabling are shipped in two different variants: for BUS and STAR network topologies. They are mostly the same. The only difference lies in the hybrid chip installed. BUS cards use high impedance output, while STAR use low impedance. Low impedance card (STAR) is electrically equal to a high impedance one with a terminator installed.h]hX_Cards for coax cabling are shipped in two different variants: for BUS and STAR network topologies. They are mostly the same. The only difference lies in the hybrid chip installed. BUS cards use high impedance output, while STAR use low impedance. Low impedance card (STAR) is electrically equal to a high impedance one with a terminator installed.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKihjAhhubh)}(hUsually, the ARCnet networks are built up from STAR cards and hubs. There are two types of hubs - active and passive. Passive hubs are small boxes with four BNC connectors containing four 47 Ohm resistors::h]hUsually, the ARCnet networks are built up from STAR cards and hubs. There are two types of hubs - active and passive. Passive hubs are small boxes with four BNC connectors containing four 47 Ohm resistors:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKohjAhhubh literal_block)}(hV | | wires R + junction -R-+-R- R 47 Ohm resistors R |h]hV | | wires R + junction -R-+-R- R 47 Ohm resistors R |}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhKshjAhhubh)}(hXThe shielding is connected together. Active hubs are much more complicated; they are powered and contain electronics to amplify the signal and send it to other segments of the net. They usually have eight connectors. Active hubs come in two variants - dumb and smart. The dumb variant just amplifies, but the smart one decodes to digital and encodes back all packets coming through. This is much better if you have several hubs in the net, since many dumb active hubs may worsen the signal quality.h]hXThe shielding is connected together. Active hubs are much more complicated; they are powered and contain electronics to amplify the signal and send it to other segments of the net. They usually have eight connectors. Active hubs come in two variants - dumb and smart. The dumb variant just amplifies, but the smart one decodes to digital and encodes back all packets coming through. This is much better if you have several hubs in the net, since many dumb active hubs may worsen the signal quality.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKyhjAhhubh)}(h7And now to the cabling. What you can connect together:h]h7And now to the cabling. What you can connect together:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjAhhubhenumerated_list)}(hhh](j)}(hNA card to a card. This is the simplest way of creating a 2-computer network. h]h)}(hMA card to a card. This is the simplest way of creating a 2-computer network.h]hMA card to a card. This is the simplest way of creating a 2-computer network.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jhjhhhhhNubj)}(hA card to a passive hub. Remember that all unused connectors on the hub must be properly terminated with 93 Ohm terminators (or something else if you don't have the right ones), although the network may work without terminators. h]h)}(hA card to a passive hub. Remember that all unused connectors on the hub must be properly terminated with 93 Ohm terminators (or something else if you don't have the right ones), although the network may work without terminators.h]hA card to a passive hub. Remember that all unused connectors on the hub must be properly terminated with 93 Ohm terminators (or something else if you don’t have the right ones), although the network may work without terminators.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jhjhhhhhNubj)}(hXA card to an active hub. Here there is no need to terminate the unused connectors except some kind of aesthetic feeling. But, there may not be more than eleven active hubs between any two computers. That of course doesn't limit the number of active hubs on the network. h]h)}(hXA card to an active hub. Here there is no need to terminate the unused connectors except some kind of aesthetic feeling. But, there may not be more than eleven active hubs between any two computers. That of course doesn't limit the number of active hubs on the network.h]hXA card to an active hub. Here there is no need to terminate the unused connectors except some kind of aesthetic feeling. But, there may not be more than eleven active hubs between any two computers. That of course doesn’t limit the number of active hubs on the network.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jhjhhhhhNubj)}(hAn active hub to another. h]h)}(hAn active hub to another.h]hAn active hub to another.}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jhjhhhhhNubj)}(hAn active hub to passive hub. h]h)}(hAn active hub to passive hub.h]hAn active hub to passive hub.}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj7ubah}(h]h ]h"]h$]h&]uh1jhjhhhhhNubeh}(h]h ]h"]h$]h&]enumtypearabicprefixhsuffix.uh1jhjAhhhhhKubh)}(hRemember that you cannot connect two passive hubs together. The power loss implied by such a connection is too high for the network to operate reliably.h]hRemember that you cannot connect two passive hubs together. The power loss implied by such a connection is too high for the network to operate reliably.}(hjZhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjAhhubh)}(h(An example of a typical ARCnet network::h]h'An example of a typical ARCnet network:}(hjhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjAhhubj)}(h R S - STAR type card S------H--------A-------S R - Terminator | | H - Hub | | A - Active hub | S----H----S S | | Sh]h R S - STAR type card S------H--------A-------S R - Terminator | | H - Hub | | A - Active hub | S----H----S S | | S}hjvsbah}(h]h ]h"]h$]h&]hhuh1jhhhKhjAhhubh)}(hXeThe BUS topology is very similar to the one used by 10BASE2 Ethernet. The only difference is in cable and terminators: they should be 93 Ohm. 10BASE2 Ethernet uses 50 Ohm impedance. You use T connectors to put the computers on a single line of cable, the bus. You have to put terminators at both ends of the cable. A typical BUS ARCnet network looks like::h]hXdThe BUS topology is very similar to the one used by 10BASE2 Ethernet. The only difference is in cable and terminators: they should be 93 Ohm. 10BASE2 Ethernet uses 50 Ohm impedance. You use T connectors to put the computers on a single line of cable, the bus. You have to put terminators at both ends of the cable. A typical BUS ARCnet network looks like:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjAhhubj)}(h~ RT----T------T------T------T------TR B B B B B B B - BUS type card R - Terminator T - T connectorh]h~ RT----T------T------T------T------TR B B B B B B B - BUS type card R - Terminator T - T connector}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhKhjAhhubh)}(hBut that is not all! The two types can be connected together. According to the official documentation, the only way of connecting them is using an active hub::h]hBut that is not all! The two types can be connected together. According to the official documentation, the only way of connecting them is using an active hub:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjAhhubj)}(hL A------T------T------TR | B B B S---H---S | Sh]hL A------T------T------TR | B B B S---H---S | S}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhKhjAhhubh)}(hThe official docs also state that you can use STAR cards at the ends of a BUS network in place of a BUS card and a terminator::h]h~The official docs also state that you can use STAR cards at the ends of a BUS network in place of a BUS card and a terminator:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjAhhubj)}(h&S------T------T------S B Bh]h&S------T------T------S B B}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhKhjAhhubh)}(hX1But, according to my own experiments, you can simply hang a BUS type card anywhere in middle of a cable in a STAR topology network. And more - you can use the bus card in place of any star card if you use a terminator. Then you can build very complicated networks fulfilling all your needs! An example::h]hX0But, according to my own experiments, you can simply hang a BUS type card anywhere in middle of a cable in a STAR topology network. And more - you can use the bus card in place of any star card if you use a terminator. Then you can build very complicated networks fulfilling all your needs! An example:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjAhhubj)}(hX S | RT------T-------T------H------S B B B | | R S------A------T-------T-------A-------H------TR | B B | | B | S BT | | | | S----A-----S S------H---A----S | | | | S------T----H---S | S S B R Sh]hX S | RT------T-------T------H------S B B B | | R S------A------T-------T-------A-------H------TR | B B | | B | S BT | | | | S----A-----S S------H---A----S | | | | S------T----H---S | S S B R S}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhKhjAhhubh)}(hXrA completely different cabling scheme is used with Twisted Pair cabling. Each of the TP cards has two RJ (phone-cord style) connectors. The cards are then daisy-chained together using a cable connecting every two neighboring cards. The ends are terminated with RJ 93 Ohm terminators which plug into the empty connectors of cards on the ends of the chain. An example::h]hXqA completely different cabling scheme is used with Twisted Pair cabling. Each of the TP cards has two RJ (phone-cord style) connectors. The cards are then daisy-chained together using a cable connecting every two neighboring cards. The ends are terminated with RJ 93 Ohm terminators which plug into the empty connectors of cards on the ends of the chain. An example:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjAhhubj)}(h ___________ ___________ _R_|_ _|_|_ _|_R_ | | | | | | |Card | |Card | |Card | |_____| |_____| |_____|h]h ___________ ___________ _R_|_ _|_|_ _|_R_ | | | | | | |Card | |Card | |Card | |_____| |_____| |_____|}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhKhjAhhubh)}(hX8There are also hubs for the TP topology. There is nothing difficult involved in using them; you just connect a TP chain to a hub on any end or even at both. This way you can create almost any network configuration. The maximum of 11 hubs between any two computers on the net applies here as well. An example::h]hX7There are also hubs for the TP topology. There is nothing difficult involved in using them; you just connect a TP chain to a hub on any end or even at both. This way you can create almost any network configuration. The maximum of 11 hubs between any two computers on the net applies here as well. An example:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjAhhubj)}(hRP-------P--------P--------H-----P------P-----PR | RP-----H--------P--------H-----P------PR | | PR PR R - RJ Terminator P - TP Card H - TP Hubh]hRP-------P--------P--------H-----P------P-----PR | RP-----H--------P--------H-----P------PR | | PR PR R - RJ Terminator P - TP Card H - TP Hub}hjsbah}(h]h ]h"]h$]h&]hhuh1jhhhKhjAhhubh)}(hLike any network, ARCnet has a limited cable length. These are the maximum cable lengths between two active ends (an active end being an active hub or a STAR card).h]hLike any network, ARCnet has a limited cable length. These are the maximum cable lengths between two active ends (an active end being an active hub or a STAR card).}(hj,hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjAhhubj)}(h========== ======= =========== RG-62 93 Ohm up to 650 m RG-59/U 75 Ohm up to 457 m RG-11/U 75 Ohm up to 533 m IBM Type 1 150 Ohm up to 200 m IBM Type 3 100 Ohm up to 100 m ========== ======= =========== h]htable)}(hhh]htgroup)}(hhh](hcolspec)}(hhh]h}(h]h ]h"]h$]h&]colwidthK uh1jHhjEubjI)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jHhjEubjI)}(hhh]h}(h]h ]h"]h$]h&]colwidthK uh1jHhjEubhtbody)}(hhh](hrow)}(hhh](hentry)}(hhh]h)}(hRG-62h]hRG-62}(hjwhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjtubah}(h]h ]h"]h$]h&]uh1jrhjoubjs)}(hhh]h)}(h93 Ohmh]h93 Ohm}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jrhjoubjs)}(hhh]h)}(h up to 650 mh]h up to 650 m}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jrhjoubeh}(h]h ]h"]h$]h&]uh1jmhjjubjn)}(hhh](js)}(hhh]h)}(hRG-59/Uh]hRG-59/U}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh]h)}(h75 Ohmh]h75 Ohm}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh]h)}(h up to 457 mh]h up to 457 m}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jrhjubeh}(h]h ]h"]h$]h&]uh1jmhjjubjn)}(hhh](js)}(hhh]h)}(hRG-11/Uh]hRG-11/U}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jrhj ubjs)}(hhh]h)}(h75 Ohmh]h75 Ohm}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj'ubah}(h]h ]h"]h$]h&]uh1jrhj ubjs)}(hhh]h)}(h up to 533 mh]h up to 533 m}(hjAhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj>ubah}(h]h ]h"]h$]h&]uh1jrhj ubeh}(h]h ]h"]h$]h&]uh1jmhjjubjn)}(hhh](js)}(hhh]h)}(h IBM Type 1h]h IBM Type 1}(hjahhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj^ubah}(h]h ]h"]h$]h&]uh1jrhj[ubjs)}(hhh]h)}(h150 Ohmh]h150 Ohm}(hjxhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjuubah}(h]h ]h"]h$]h&]uh1jrhj[ubjs)}(hhh]h)}(h up to 200 mh]h up to 200 m}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jrhj[ubeh}(h]h ]h"]h$]h&]uh1jmhjjubjn)}(hhh](js)}(hhh]h)}(h IBM Type 3h]h IBM Type 3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh]h)}(h100 Ohmh]h100 Ohm}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh]h)}(h up to 100 mh]h up to 100 m}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jrhjubeh}(h]h ]h"]h$]h&]uh1jmhjjubeh}(h]h ]h"]h$]h&]uh1jhhjEubeh}(h]h ]h"]h$]h&]colsKuh1jChj@ubah}(h]h ]h"]h$]h&]uh1j>hj:ubah}(h]h ]h"]h$]h&]uh1jhhhKhjAhhubh)}(hXThe maximum length of all cables connected to a passive hub is limited to 65 meters for RG-62 cabling; less for others. You can see that using passive hubs in a large network is a bad idea. The maximum length of a single "BUS Trunk" is about 300 meters for RG-62. The maximum distance between the two most distant points of the net is limited to 3000 meters. The maximum length of a TP cable between two cards/hubs is 650 meters.h]hXThe maximum length of all cables connected to a passive hub is limited to 65 meters for RG-62 cabling; less for others. You can see that using passive hubs in a large network is a bad idea. The maximum length of a single “BUS Trunk” is about 300 meters for RG-62. The maximum distance between the two most distant points of the net is limited to 3000 meters. The maximum length of a TP cable between two cards/hubs is 650 meters.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjAhhubeh}(h]cabling-arcnet-networksah ]h"]cabling arcnet networksah$]h&]uh1hhhhhhhhKQubh)}(hhh](h)}(hSetting the Jumpersh]hSetting the Jumpers}(hj)hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj&hhhhhMubj)}(hX- Every ARCnet card has its own "unique" network address from 0 to 255. Unlike Ethernet, you can set this address yourself with a jumper or switch (or on some cards, with special software). Since it's only 8 bits, you can only have 254 ARCnet cards on a network. DON'T use 0 or 255, since these are reserved (although neat stuff will probably happen if you DO use them). By the way, if you haven't already guessed, don't set this the same as any other ARCnet device on your network! - There may be ETS1 and ETS2 settings. These may or may not make a difference on your card (many manuals call them "reserved"), but are used to change the delays used when powering up a computer on the network. This is only necessary when wiring VERY long range ARCnet networks, on the order of 4km or so; in any case, the only real requirement here is that all cards on the network with ETS1 and ETS2 jumpers have them in the same position. Chris Hindy sent in a chart with actual values for this: ======= ======= =============== ==================== ET1 ET2 Response Time Reconfiguration Time ======= ======= =============== ==================== open open 74.7us 840us open closed 283.4us 1680us closed open 561.8us 1680us closed closed 1118.6us 1680us ======= ======= =============== ==================== Make sure you set ETS1 and ETS2 to the SAME VALUE for all cards on your network. h]j)}(hhh](j)}(hXEvery ARCnet card has its own "unique" network address from 0 to 255. Unlike Ethernet, you can set this address yourself with a jumper or switch (or on some cards, with special software). Since it's only 8 bits, you can only have 254 ARCnet cards on a network. DON'T use 0 or 255, since these are reserved (although neat stuff will probably happen if you DO use them). By the way, if you haven't already guessed, don't set this the same as any other ARCnet device on your network! h]h)}(hXEvery ARCnet card has its own "unique" network address from 0 to 255. Unlike Ethernet, you can set this address yourself with a jumper or switch (or on some cards, with special software). Since it's only 8 bits, you can only have 254 ARCnet cards on a network. DON'T use 0 or 255, since these are reserved (although neat stuff will probably happen if you DO use them). By the way, if you haven't already guessed, don't set this the same as any other ARCnet device on your network!h]hXEvery ARCnet card has its own “unique” network address from 0 to 255. Unlike Ethernet, you can set this address yourself with a jumper or switch (or on some cards, with special software). Since it’s only 8 bits, you can only have 254 ARCnet cards on a network. DON’T use 0 or 255, since these are reserved (although neat stuff will probably happen if you DO use them). By the way, if you haven’t already guessed, don’t set this the same as any other ARCnet device on your network!}(hjBhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj>ubah}(h]h ]h"]h$]h&]uh1jhj;ubj)}(hXThere may be ETS1 and ETS2 settings. These may or may not make a difference on your card (many manuals call them "reserved"), but are used to change the delays used when powering up a computer on the network. This is only necessary when wiring VERY long range ARCnet networks, on the order of 4km or so; in any case, the only real requirement here is that all cards on the network with ETS1 and ETS2 jumpers have them in the same position. Chris Hindy sent in a chart with actual values for this: ======= ======= =============== ==================== ET1 ET2 Response Time Reconfiguration Time ======= ======= =============== ==================== open open 74.7us 840us open closed 283.4us 1680us closed open 561.8us 1680us closed closed 1118.6us 1680us ======= ======= =============== ==================== Make sure you set ETS1 and ETS2 to the SAME VALUE for all cards on your network. h](h)}(hXThere may be ETS1 and ETS2 settings. These may or may not make a difference on your card (many manuals call them "reserved"), but are used to change the delays used when powering up a computer on the network. This is only necessary when wiring VERY long range ARCnet networks, on the order of 4km or so; in any case, the only real requirement here is that all cards on the network with ETS1 and ETS2 jumpers have them in the same position. Chris Hindy sent in a chart with actual values for this:h](hXThere may be ETS1 and ETS2 settings. These may or may not make a difference on your card (many manuals call them “reserved”), but are used to change the delays used when powering up a computer on the network. This is only necessary when wiring VERY long range ARCnet networks, on the order of 4km or so; in any case, the only real requirement here is that all cards on the network with ETS1 and ETS2 jumpers have them in the same position. Chris Hindy <}(hjZhhhNhNubj)}(h chrish@io.orgh]h chrish@io.org}(hjbhhhNhNubah}(h]h ]h"]h$]h&]refurimailto:chrish@io.orguh1jhjZubh.> sent in a chart with actual values for this:}(hjZhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhMhjVubj)}(hXo======= ======= =============== ==================== ET1 ET2 Response Time Reconfiguration Time ======= ======= =============== ==================== open open 74.7us 840us open closed 283.4us 1680us closed open 561.8us 1680us closed closed 1118.6us 1680us ======= ======= =============== ==================== h]j?)}(hhh]jD)}(hhh](jI)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jHhjubjI)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jHhjubjI)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jHhjubjI)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jHhjubhthead)}(hhh]jn)}(hhh](js)}(hhh]h)}(hET1h]hET1}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh]h)}(hET2h]hET2}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh]h)}(h Response Timeh]h Response Time}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh]h)}(hReconfiguration Timeh]hReconfiguration Time}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jrhjubeh}(h]h ]h"]h$]h&]uh1jmhjubah}(h]h ]h"]h$]h&]uh1jhjubji)}(hhh](jn)}(hhh](js)}(hhh]h)}(hopenh]hopen}(hj'hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj$ubah}(h]h ]h"]h$]h&]uh1jrhj!ubjs)}(hhh]h)}(hopenh]hopen}(hj>hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj;ubah}(h]h ]h"]h$]h&]uh1jrhj!ubjs)}(hhh]h)}(h74.7ush]h74.7us}(hjUhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjRubah}(h]h ]h"]h$]h&]uh1jrhj!ubjs)}(hhh]h)}(h840ush]h840us}(hjlhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjiubah}(h]h ]h"]h$]h&]uh1jrhj!ubeh}(h]h ]h"]h$]h&]uh1jmhjubjn)}(hhh](js)}(hhh]h)}(hopenh]hopen}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh]h)}(hclosedh]hclosed}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh]h)}(h283.4ush]h283.4us}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh]h)}(h1680ush]h1680us}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jrhjubeh}(h]h ]h"]h$]h&]uh1jmhjubjn)}(hhh](js)}(hhh]h)}(hclosedh]hclosed}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh]h)}(hopenh]hopen}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj ubah}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh]h)}(h561.8ush]h561.8us}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj ubah}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh]h)}(h1680ush]h1680us}(hj6 hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj3 ubah}(h]h ]h"]h$]h&]uh1jrhjubeh}(h]h ]h"]h$]h&]uh1jmhjubjn)}(hhh](js)}(hhh]h)}(hclosedh]hclosed}(hjV hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjS ubah}(h]h ]h"]h$]h&]uh1jrhjP ubjs)}(hhh]h)}(hclosedh]hclosed}(hjm hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjj ubah}(h]h ]h"]h$]h&]uh1jrhjP ubjs)}(hhh]h)}(h1118.6ush]h1118.6us}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj ubah}(h]h ]h"]h$]h&]uh1jrhjP ubjs)}(hhh]h)}(h1680ush]h1680us}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj ubah}(h]h ]h"]h$]h&]uh1jrhjP ubeh}(h]h ]h"]h$]h&]uh1jmhjubeh}(h]h ]h"]h$]h&]uh1jhhjubeh}(h]h ]h"]h$]h&]colsKuh1jChjubah}(h]h ]h"]h$]h&]uh1j>hj|ubah}(h]h ]h"]h$]h&]uh1jhhhMhjVubh)}(hPMake sure you set ETS1 and ETS2 to the SAME VALUE for all cards on your network.h]hPMake sure you set ETS1 and ETS2 to the SAME VALUE for all cards on your network.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjVubeh}(h]h ]h"]h$]h&]uh1jhj;ubeh}(h]h ]h"]h$]h&]jXjYuh1jhhhMhj7ubah}(h]h ]h"]h$]h&]uh1jhhhMhj&hhubeh}(h]setting-the-jumpersah ]h"]setting the jumpersah$]h&]uh1hhhhhhhhMubh)}(hhh](h)}(hLED Indicatorsh]hLED Indicators}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj hhhhhM$ubh)}(hFMany cards have red and green LEDs, which have the following meanings:h]hFMany cards have red and green LEDs, which have the following meanings:}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM&hj hhubj)}(hX=============== =============== ===================================== Green Red Status =============== =============== ===================================== OFF OFF Power off OFF Short flashes Cabling problems (broken cable or not terminated) OFF (short) ON Card init ON ON Normal state - everything OK, nothing happens ON Long flashes Data transfer ON OFF Never happens (maybe when wrong ID) =============== =============== =====================================h]j?)}(hhh]jD)}(hhh](jI)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jHhj ubjI)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jHhj ubjI)}(hhh]h}(h]h ]h"]h$]h&]colwidthK%uh1jHhj ubj)}(hhh]jn)}(hhh](js)}(hhh]h)}(hGreenh]hGreen}(hjF hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM)hjC ubah}(h]h ]h"]h$]h&]uh1jrhj@ ubjs)}(hhh]h)}(hRedh]hRed}(hj] hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM)hjZ ubah}(h]h ]h"]h$]h&]uh1jrhj@ ubjs)}(hhh]h)}(hStatush]hStatus}(hjt hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM)hjq ubah}(h]h ]h"]h$]h&]uh1jrhj@ ubeh}(h]h ]h"]h$]h&]uh1jmhj= ubah}(h]h ]h"]h$]h&]uh1jhj ubji)}(hhh](jn)}(hhh](js)}(hhh]h)}(hOFFh]hOFF}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM+hj ubah}(h]h ]h"]h$]h&]uh1jrhj ubjs)}(hhh]h)}(hOFFh]hOFF}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM+hj ubah}(h]h ]h"]h$]h&]uh1jrhj ubjs)}(hhh]h)}(h Power offh]h Power off}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM+hj ubah}(h]h ]h"]h$]h&]uh1jrhj ubeh}(h]h ]h"]h$]h&]uh1jmhj ubjn)}(hhh](js)}(hhh]h)}(hOFFh]hOFF}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM,hj ubah}(h]h ]h"]h$]h&]uh1jrhj ubjs)}(hhh]h)}(h Short flashesh]h Short flashes}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM,hj ubah}(h]h ]h"]h$]h&]uh1jrhj ubjs)}(hhh]h)}(h1Cabling problems (broken cable or not terminated)h]h1Cabling problems (broken cable or not terminated)}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM,hj ubah}(h]h ]h"]h$]h&]uh1jrhj ubeh}(h]h ]h"]h$]h&]uh1jmhj ubjn)}(hhh](js)}(hhh]h)}(h OFF (short)h]h OFF (short)}(hj9 hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM.hj6 ubah}(h]h ]h"]h$]h&]uh1jrhj3 ubjs)}(hhh]h)}(hONh]hON}(hjP hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM.hjM ubah}(h]h ]h"]h$]h&]uh1jrhj3 ubjs)}(hhh]h)}(h Card inith]h Card init}(hjg hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM.hjd ubah}(h]h ]h"]h$]h&]uh1jrhj3 ubeh}(h]h ]h"]h$]h&]uh1jmhj ubjn)}(hhh](js)}(hhh]h)}(hONh]hON}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM/hj ubah}(h]h ]h"]h$]h&]uh1jrhj ubjs)}(hhh]h)}(hONh]hON}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM/hj ubah}(h]h ]h"]h$]h&]uh1jrhj ubjs)}(hhh]h)}(h-Normal state - 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