On Wed, 3 Jul 2002 RickL@solunet.com wrote:
Das ist true.
Ahh... My only knowledge is with audio stuff, as in balanced/unbalanced mics, line level stuff, etc. where there's gotta be three lines to be "balanced". Physically, the coil in the mike is tapped in the middle for the ground reference and either end of the coil becomes the +/-. Charles
There is also balanced coax type cable and connectors (PL75-9's used a lot in Video applications) that work on three wires: TX, RX and ground. The ground is shared, as ground is, well, ground.
Rick Team Solunet
-----Original Message----- From: Jeff Mcadams [mailto:jeffm@iglou.com] Sent: Tuesday, July 02, 2002 8:59 AM To: usr-tc@mailman.xmission.com Subject: Re: [USR-TC] Anyone familiar with Balance and Un-Balanced E1/PRI
Also sprach Charles Sprickman
I'm pretty sure T1's are NOT balanced. Think of the tx and rx pairs as two seperate lines, they aren't necessarily bundled together. If it was balanced, you'd see three wires per tx/rx "pair"; you'd have the ground, positive and negative... Haven't seen that (yet). The closest I've seen is a shielded run...
Being balanced doesn't require a ground. A ground just means that its grounded. Balanced is just having two signals of opposite polarity and reading the signal as half the voltage differential between the two wires. Unbalanced is reading the signal as the differential between the signal wire (just one) and ground. Ground, in the unbalanced case, can be a local ground, there doesn't have to be a ground in the cable to measure against. In fact, after a cable run, its likely to *not* have the same potential as a real ground as there's a good chance that there will have been current induced in it. -- Jeff McAdams Email: jeffm@iglou.com Head Network Administrator Voice: (502) 966-3848 IgLou Internet Services (800) 436-4456
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