Archive for the ‘Telecom’ Category:

2019-06-21 Telephone Ring Interception

from FB group Bell Telephone… June 21 Travis Russell I connected a neon lamp – just the lamp with no resistor or no capacitor – across the incoming line. The 90VAC ringer current causes the neon lamp to conduct, but as soon as it conducts, the Lamp conducts DC and the CO senses it as

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2019-06-09 Strange 3 Conductor Crossconnect Wire

from FB group Bell Telephone… Jun 11 I’ve seen this 3 wire crossconnect wire, but I can’t remember where. Long ago we had racks of datacomm with a patch panel with patch cords. We used 3 wires of four wire IW, one wire for common, one for transmit and one for receive. These were for

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2019-05-22 Fiber Installing In Near Future

from FB group Orange Talk May 23 Jack What I’ve seen is the internet service providers have eliminated the lowest speeds and lowest prices of course, and now offer only higher speeds and higher prices. For the city of Orange, there will be at&t fiber cables installed in the near future, so Sputum cable will

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2019-05-21 Upstream Data Concentration

from FB group Bell Telephone… May 22 Keith Hlavacs I was connecting up equipment with cat5e and cat6 cabling capable of 1000 Meg’s, and there were 48 ports on the switches on campus. The GBIC feeds on, say, 4 switches were daisychained, so a total of 192 ports per fiber optic feeder. So… I see

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2019-04-27 VoIP Phone Trunks

from FB group Bell Telephone.. 2019 Apr 27 Mason Lepore One other point: virtual circuits are not like POTS lines. An incoming call is not like it’s on a dedicated line. I think about it like part of the central office has been moved to the customers’ location. There are trunks from the real CO,

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2019-04-18 We Take A Risk Every Time We Touch A Wire

from FB group Bell Telephone of… Apr 21 Jim Engle One time I was connecting up a POTS modem line and I was getting the crossconnect wire into the 66 block ready to punch them down. BRZZAP! I got zapped by the AC! Some idjit plugged a three prong plug into a 2 prong ungrounded

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2019-04-01 Microwave Versus Radar Power

from FB group Bell Telephone of … Apr 2 Sam Corcione The Radars I worked on in the army were putting out peak power at 5 megawatts, but because it was listening most of the time, the average power was “only” 5 kilowatts, still equal to several microwave ovens. But it had to illuminate a

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2019-03-10 Phones Work During Power Outages?

From FB group Orange Talk Mar 11 The old fashion ‘non electric’ phone depends on the phone line for its power. The old phone lines used to have backup power at the central office, so they worked if the power went out. But nowadays the power comes from a local box which has batteries but

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2018-12-14 Voice Filter For Telecom And Radio Comm

from FB group Building Transistor Radios 2018-12-14 A voice band filter for telecomm or radio comm. The .068 or .0068 uF caps can be made by putting a 0.1 and 0.22 or .01 and .022 uF capacitors in series. The opamp can be a 1458 ‘dual 741’ opamp.

2018-11-20 Solder V. IDC Punchdown

from FB group Bell Telephone… 2018-11-22 Happy Turkey day! I use solder all the time, and I trust it as long as it’s done properly. But one thing I learned in my decades of telephone work is that the wiring systems the telcos developed were tested and proven before they were deployed, and they were

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