Exclusion by Modem (3)
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Figure 5
Figure 5 above and 6 below are the before and after modifications required at the common connection point. Notice the telephone line will no longer feed directly to the phones but must be wired to just the modem. Exceptions aside for CID devices and such, all calls will be travelling through the modem. If your Mac as mine has a set turn on/off time daily for various tasks and if these involve the use of the modem, remember the rest of the phones will appear dead. This is a good thing. It can take you by surprize at first.
Figure 6
Figure 7 is a helpful chart to guide you in the common use of the colors at the jacks, CCP et al. The colors are not written in stone but just about every telephone related industry uses this in North America. Some may differ but they are alone. The wire does not have to be as presented, perhaps you have an older dwelling that has only 2 wires to the existing modem jack (plastic coated variety called Style C, cloth covered was Style A). If so you would want to provide at least another 2 wires to this spot. My recommendation is the Catagory 3, 4, or 5 style of wire found today to best be prepared for the future. In other words, do the job once, correctly.
Figure 7
All ideas are not all that profound but if you have saved the time having to download a mega-megabyte file more than once it will be time well spent. Once the project is complete you will seldom know when it is being used because all your PPP sessions will work just fine, so what was the big deal anyway? This is the no news is good news theory in practise.
One more time
RJxx: Registered Jack - This is a term that is used and abused. The actual meaning of this is how a jack is wired, not what it looks like. Let me try and explain. A RJ11 jack is wired so that one phone circuit is connected to the centre 2 pins and nothing else. This could be a 4, 6, or 8 pin jack it does not matter. RJ12, 14 ... designations are much the same but have additional signaling wired to the other pins of the jack such as grounds, busy signalling, second line, etcetera. Things such as an RJ48 arrangement has to be a 8 pin jack because pins 7 & 8 must be used.
Wire Catagories: This is also a common misnomer in thinking. Often the "consultant" will demand Catagory 5 type wiring and insist it be so. True the future will likely demand the use of Cat 5 practices but remember the weakest link in the chain could be the source. ATM and other high traffic transports use Cat 3 type of wire to get it to your building! This is often the breaking point of a good network and a working network. If the in-house network has very high speeds then Cat 5 or 6 would be indicated but for everyday voice grade and such catagory 3 is fine. The difference is the spacing between cables and the twist of the conductors. Other factors are the practice of placing the cable and how it is interconnected. In a very high speed network using a baseT type of transport even neatly done tight square corners with the use of Cat 5 can degrade the effective speed to something no better than what it would have been with the use of Cat 3.
© 1997 1998 D2M A graduate of Curmudgeon Emeritus.
Some terminology used here:
Common Connection Point (CCP): This is the device that terminates all the cables/wires from each jack/outlet of the telephone wiring within the dwelling at a single common point.
If you are uncertain about any of the techniques or ideas presented, please take the time to write. Please be patient in expecting an immediate reply ...Don
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