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Author Topic: Old telephone plugs. Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 03-04-2009 08:00 AM                        I don't know about the correct orientation for a 4-pin plug, but there are adapters to convert this to RJ11, so it would be easy enough to figure out if someone has one of these adapters. In an RJ11 connector, the center pair (pins 3 and 4) is tip and ring, but I can never remember which pin is which. Our ringing cadence is 2 sec. ring, 4 sec. silence, which was supposedly designed to be annoying enough to get people to answer the phone (and, thus, generate billable calls). It sounds as if your ringing voltage is close enough to ours that most phones will ring just fine (but sound wrong). You can get a ringing freqnency generator (the Western Electric 118A is commonly available on ebay) if you want it to sound right. In the US, a normal line is supposed to support a REN of 5 (i.e. it can ring up to five 500-set ringers, and often more if the CO is nearby). This is a problem with many VOIP ATA devices, which often support much lower RENs and can thus be difficult to interface with a house full of telephones. Newer sets with lighted dials use LEDs and can be powered off the line current. The transformers were needed for older sets. If you use a transformer, be sure that you do _not_ connect a set that is wired for A-lead control to the same line, as it will short the yellow and black pairs and either blow a fuse or burn down the house. It's interesting that your telephones are so similar to ours, yet different enough to be distinctive. The 2500 set is still quite common here, particularly in commercial buildings, but rotary sets are rare.  |  IP: Logged Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 03-05-2009 05:51 PM                     The maximum REN over here is 4. Most 'phones, including converted old-style ones, have a REN of 1. If they weren't converted they would be 4. Some of the older modern ones were higher than 1. quote: Scott Norwood It's interesting that your telephones are so similar to ours, yet different enough to be distinctive. The 2500 set is still quite common here, particularly in commercial buildings, but rotary sets are rare. That's why I decided to get US 'phones for the couple of foreign ones which I've got, rather than, say, French ones; there's an equivalent to each standard model, and they make an interesting comparison. Scott, I've sent you a private message.  |  IP: Logged Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 03-11-2009 04:33 PM                     Scott, I sent you a private message last week, but it's status is still unread; please check your private messages.  |  IP: Logged

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