Unnamed Administration sources reported that Charles P. said: > > Would doubling up on pairs help with this one? or would there be other > problems... > > > ----- Original Message ----- > From: "David Lesher" <[EMAIL PROTECTED]> > To: "KXT Mailing list" <[EMAIL PROTECTED]> > Sent: Thursday, August 15, 2002 10:33 PM > Subject: Re: KX-T: Fw: Cabling limitation on KXTD1232 > > > > > > Pull 20Gauge....
You MIGHT double up on pairs. It's a complex issue. We don't know what the limiting factor is. Two come to mind: loop resistance and XsubC. The loop resistance will be improved by suing 20 Ga or doubling up 22. The capactive reactance issue is this. It acts as a low-pass filter & tends to shunt the high-frequency side of the digital signalling between the phones and the KSU. If the signals are too degraded by this, the phones will drop sync, act weird and otherwise make folks annoyed. Doubled up 22 Ga pairs would, I'd think, have 2X or more the capacitance of one pair at 20 Ga. (Note my brain is having a Code Red day & no results are under warranty...) But... that said, I really think it's a loop resistance limitation and not a loop XsubC. Why? The phone signaling is just not that fast; and the cable not that bad. Plus, PBXi tend to use lower loop voltages than POTS. (With the available ~48v; loop R is less of an issue...) You could test: get a pair of decade R boxes and crank up the loop R until they get flaky. Go back to a rational valve and drop the C box across T&R and see when the phone flakes. A wire table for the cable (see Belden, or another cable co) would show you their values. Compare. ' -- A host is a host from coast to [EMAIL PROTECTED] & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 _________________________________________________________________ KX-T Mailing list --- http://kxthelp.com/ Subscription changes: http://kxthelp.com/mailman/listinfo/kxt
