sundance-communications.com/forum Forums VOIP Phones & IP PBX Networking Gigabit to Desktop: Is it a hype or real demand?

Originally posted by Fletcher:
John, your "RJ45/RJ11 Splitters" would have come in handy for me once or twice where I had no other choice but to split an existing phone or data cable due to damage in a totally inaccessible place to the other (repulling cable was not an option). The product is interesting, though I'd like to see something done with the fourth pair in the splitter (a second telephone line would be my first choice, PoE second). As for using it in new installs or in place of two cables, no way I'd ever consider it. Ditto the RJ45 dual splitter. Any data cable I pull must be able to be certified (whether or not it is), and splitters of any type do not allow for that.

Jack

Originally posted by dualcomm:
The fourth pair can definitely be used for second telephone line.

Originally posted by dualcomm:
Would you please elaborate in more detail how you certify or qualify the cabling? what kind of testing equipment or tool do you use? Why is that "splitters of any type do not allow for that"

Originally posted by Fletcher:
How so? Unless the picture of your splitter is incorrect, only pins 4 and 5 are installed on the telephone side of the splitter.

I certify it by doing permanent link testing, which is usually from workstation to patch panel (jack to jack). I have test adapters that have jacks instead of plugs to test plugs, but nothing to test a splitter. No one (Fluke, Ideal, etc.) makes such a test lead, because splitters are not a standard installation. Channel link testing wouldn't be possible at all. The only way to test a permanent link that has splitters on both ends is to remove the splitters. Sure, that link will more than likely pass a catx certfication, but if I were to test through your "RJ45/RJ11" splitters, the test would fail for numerous reasons: wiremap would be first (4/5 and 7/8), then the failures would pile up from there. I wouldn't even bother certifying a network with splitters, because it would be pointless.

Will your splitters work? Probably. Is it right? About as right as punching down data cable only 1,2,3, and 6 on the jacks and patch panels.

As I wrote before, your splitters would be of some use in a small number of applications, or to postpone an inevitable recabling job. I will say this though: if I ever walk into a phone room and find 50 or 100 splitters hanging mid-air, I'm going to be, to put it mildly
... less than pleased.

Jack

Originally posted by EV607797:
Does anyone here possess an accurate means to test and configure an RJ45? My CTX analog loss test set's batteries are dead and I can't justify the cost to replace them. I ask this question since it it getting more and more difficult to locate "thousand cycle" (1004 KHz) test numbers anymore. This is especially true with CLECs. Does anyone really use dial-up services that use an RJ45 jack anymore? I can say with certainty that I have not installed/configured one in at least twenty years.

Originally posted by EV607797:
John:

HERE is the wiring diagram for an RJ45 jack. As you can see, this is used for a modem connection to the outside network with built-in loop loss programming. This is accomplished via the resistor placed across pins 7 and 8. This loss is measured by dialing into a 1004 cycle tone source to determine the appropriate resistor to install.

By "RJ45", are you referring to a 10/100 Base-T network connection? Those are two different animals for which there is no RJ designation.

The term RJ = Registered Jack. RJs are telephone and data jacks or applications registered with the FCC. Numbers, like RJ-11, RJ45, etc. are widely misused in the telecommunications industry. A much more precise way to identify a jack is to specify the number of positions (width of opening) and number of conductors. Example: "8-position, 8-conductor jack" or "6-position, 4-conductor jack".

HERE IS SOME MORE INFORMATION on this subject for future reference. I hope this clears things up.

Sometimes I would like to take 10 minutes instead 10 second to download a 5GB file, so that I can take a break and get a cup of coffee or something else, which is definitely a much more healthy way to live. :-))[/QB]

Just take an example of how long it takes to move a 10MB file over network. At 10M, it is 10 seconds (estimated with 20% overhead), 1 second at 100M and 0.1 second at 1G. You see, from 10M to 100M, you save 9 seconds, but from 100M to 1G, you save only 0.9 second. Is this saving of 0.9 second the ROI you talked about? [/QB]

Originally posted by igadget:
... what about the 140G disk to disk nightly backup