Each 4-pair wire has 8 wires in the "blue wrapper" cable. You only need 2 pairs, 4 of the wires, for 100MB Ethernet.
You could split the wire at the wall jack and at the switch end where it goes through the punch down thingy (the name escapes me at the moment.) You only need to run 1 blue/4 pair wire cable to each desk. You could put a small hub on each desk to split our more sockets. For the life of me I will never understand why people believe that each cubical/desk needs it own 4-pair cable, CAT5 cable connect back to the server. Normally cubes are arranged so that at least 4 are connecting to the electric lines via one feeder line. Every house in the city does not have a private electrical feed back to the power plant. With a network you bring one, 1, une, uno, eine, CAT5 Cable to an area, then you place hub or a switch. Then you connect each user to this hub/switch. Stop screaming. What does a hub cost compared having to wait for the CAT5 Cable guy to drag a new wire each time and the he has to bring your network up and down several times because none of the wires are labeled correctly and they are all blue. Eventually the conduit fills up and you have to put in another 8 inch conduit, but the elevator shaft is full,... Yes, go on, tell me that each user requires 100 Mbps to their desk on a continuous basis or they will not get any work done (the phone sucks about 100 kilo-bits, BITS! Per second. 100kps or less.) They don't. Unless of course they are running an older Microsoft version of the Enterprise's Transporters with Scotty at the other end. Look folks, in your house there is a phone line that connects you, not all the way back to the phone company, but a green box in your neighborhood. This little box has about 1 line back to another box for every 10 phones in your neighborhood and so on to larger boxes until you hit the telephone company. (1:10 1:8 1:6, whatever, lets go with the easy math here.) The telephone works all the time except when everyone tries to make a call at the same time. You don't need to drag wires so every phone in the country connects directly to a switch. Yes, a switch! The calls all branch together up stream to the switch through a set of switches/hubs and then connect to the DS3 in the cloud. They can do this cause some guy name A.K. Erlang, http://pass.maths.org.uk/issue2/erlang/, spawned the erlang, "A measurement unit of the average traffic usage of a telecommunications facility during a period of time (normally a busy hour) with reference to one hour of continuous use. The capacity of Erlangs is the ratio of time during which a facility is occupied to the time the facility is available for occupancy with reference to one hour. For example, a 12 minute call is 0.2 Erlangs. 1 Erlang equals 36 centum call seconds (CCS)." Or simply put: "In 1917, he looked at a village telephone exchange. He supposed that the village has a certain number of telephone lines going from it to the outside world. We'll call the number of lines C. People in the village want to make calls to the outside world. We don't know when they will want to call or how long their calls will last, but let's suppose that there are on average v calls starting per minute, and that the average length of a call is one minute. Erlang wanted to know what fraction of callers would find that all the C lines leading out of the village were already full, and so would not be able to make their call until later. He worked out this formula, which gives the answer: This is called Erlang's formula. The left hand side, E(v,C), represents the proportion of callers that find all the lines already full, and the right hand side gives an equation for that quantity. If you know how big v and C are, you can work out what proportion of calls cannot get out of the village. " Face it 95% of the time the wires are idle. If your network seems slow it is because you have a pig sitting on a bottle neck somewhere in the network. Please, stop dragging wires everywhere, learn how to use a switch. Can anyone say "hub and spoke"? Race "The Tyrant" Vanderdecken Yes, you can use one pair for data and one pair for voice to keep the networks separate if you like to do that type of thing. Yes, splitting the pair at the wall jack and that thingy on the other end is work, but wait till your boss finds out that you have twice as many CAT5 runs as you will every need or that you are wasting have the wire. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Harry McGregor Sent: 03 January 2005 16:34 To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [Asterisk-Users] phones with two ethernet ports Personally I would run the two Cat5 runs. I am in a situation where we "only" have two cat 5 cables into each office. Once (if) we start our VOIP deployment we will be using Zultys 4x4 phones with 3 10/100 ports (802.1q capable switch built in) on one office port, and the other will be for the researcher's "main" desktop on our gigabit switches. I would love to be able to connect more systems at Gig, but putting a small gig switch in each office is cost prohibitive, and a management nightmare. Try finding a VOIP Phone that does gigabit... Won't happen for a while. Cable is cheap when you look at the cost of running the cable. If you use two boxes, it will take virtually the same amount of time to run two as it does to run one. Harry On Sun, 2005-01-02 at 16:35 -0500, Erick Perez wrote: > Hi there, what phones are available that have two ethernet ports? > I want to do some cabling at a new installation and i heard there are > such phones (SIP i guess) out there. That way i dont have to run two > cat5 to the user desktop. > I think 3COM had one but can't find the web site reference for the two > port phone > > thanks, > > erick > _______________________________________________ > Asterisk-Users mailing list > [email protected] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > -- Harry McGregor, Computing Manager Tucson Support Group - U.S. Geological Survey University of Arizona - Environment and Natural Resource Building 520-670-5574 (office) - [EMAIL PROTECTED] 520-661-7875 (Cell) - [EMAIL PROTECTED] The opinions/statements expressed herein are my own and should not be taken as a position, opinion, or endorsement of the University of Arizona or the U.S. Geological Survey. _______________________________________________ Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
