"The phone is a remarkably complex, simple device, and very rarely ever needs repairs, once you fix them." - Dan/Panther
Started by bellsystem, June 26, 2017, 05:18:03 PM
Quote from: bellsystem on June 26, 2017, 05:18:03 PMDoes anyone know if they can maintain an analog connection between the central office and their house/business using just 1 cable, like PRI, but with analog channels instead of digital? Is there a name for this type of technology to distinguish it from PRI?
QuoteI want the call quality and reliability of having as many separate landlines coming into the building as I needed outside lines, but the convenience that one large cable coming in offers - in addition to one cable, Direct Inward Dialing and Direct Outward Dialing are my primary concerns.
Quote from: bellsystem on June 26, 2017, 05:18:03 PM Transmission must be analog, not digital, for call quality and reliability - the call quality should be basically the same as that with a separate standalone landline connection.
Quote Digits should be dialed immediately. I know many systems "hold" digits and then analyze the digits dialed using a "dial plan". Internally, this might be of some used. But if "9" is dialed for an outside line, I want the PBX to grab an outside line for the station and step out of the picture. The digits should be sent to the central office then as they are dialed, not all at the end (again, as with a separate, standalone landline connection).
Quote Going along with my second point, all central office connections, whether they are individual cables or one large one with separate analog channels, would have to be identical. Because the circuit will be grabbed as soon as "9" is dialed, all "features" (i.e. ability to make Long Distance/International calls) would have to be the same for each line/channel, since it would be impossible for the actual intended number to be analyzed. Basically, the call should be being routed as it is being dialed, not after. There's extreme controversy it seems regarding 9-1-1 and 9 9-1-1 going around (the linked petition will be impossible to force for systems such as the one I desire). I know that 9-1-1 will not be doing anything because to the central office, it looks like 1-1 has been dialed which could have easily been a switchhook mishap (I assume this is why 1-1 is not rerouted to 9-1-1). The PBX will be in a home environment (not a public system) and since I, most of the time, will be its only user, I will know to dial 9911 instead of 911 anyways. 911 should NOT connect to anything.
Quote I don't believe nesting PBXs will be a problem. I am going to buy a PBX that will support at least 50 stations, but one of the "stations" will end up being a corded switchboard PBX (PMBX or Private Manual Branch Exchange), and other "stations" may be other sub-PBXs that are PABXs, like the main one. Is there any way to use features like Direct Inward Dial from telephone stations to PBXs nested further down in the tree?
QuoteI'm trying to figure out which networking technologies would best meet most, if not all, of my requirements. My guess is it would be some technology that lies between separate regular landlines and PRI, if there is one. The PBXs that will actually be used are arbitrary and irrelevant, but they will all be analog and have no digital support.
QuoteIs there a sort of medium between separate analog lines and PRI? I'm looking for a medium that will retain an analog transmission between the PBX and the Central Office, but the switching technology itself can obviously be digital (as all PABXs are).
QuoteIs there any way to maintain an analog connection between the central office and the PBX without running separate regular landlines for each trunk? Analog will be needed to support good call quality for regular analog rotary and pushbutton phones, fax machines, and modems (including dial-up). I want whatever trunk technology is used to function like a standalone line without actually being 4 or 6 separate standalone lines. Costs aside, my primary concern with having standalone lines will be direct inward dialing as well as direct outward dialing. Even if there are 50 stations, there are only a few numbers I'd want to have DID and DOD for - otherwise, I want only ONE telephone number - and NOT as many numbers as there are trunks (this might be appropriate for a Key Telephone System but not a PBX), since I want one number to be used for Caller ID from any non DOD phone, which I don't think standalone lines would support.
QuoteIf my internal extensions range from 1000 to 1500, the numbers I need supported for DID/DOD would be 1000 as well as a few other numbers between 1000 and 1200. I don't want to have to purchase a whole block of 200 "numbers" if that can be avoided (unless there is no additional cost).I am estimating between 4 and 6 trunks will be required. Costs are not a concern, although since this will be installed in a home environment with 1 bill-payer, ideally they should be low.Summary: No digital transmission (i.e. packet switching) Analog multiplexing is possible so multiplexing is fine if each individual circuit is analog. Routing as calls are dialed, not after Compatibility with DID and DODCLARIFICATION: I'm not asking anything about a PBX at all. I'm inquiring about the protocols used, specifically PRI, and if an analog variant of PRI (possibly a predecessor to PRI) exists."
Quote from: bellsystem on June 27, 2017, 02:28:53 PMBut that means going digital, which is not really a sacrifice I think I should have to make. SIP and VoIP are definitely not options and I will never use SIP/VoIP.
Quote from: bellsystem on June 27, 2017, 02:28:53 PMThe best quality is not with VoIP. The folks on networkengineering at StackExchange tried to convince me that digital was superior to analog too.
Quote from: bellsystem on June 27, 2017, 03:02:24 PMYou can either give in or fight. I'm not a puppet that AT&T or Verizon can control. And it's not just me - see www.savelandlines.orgAnyways, I don't want to debate whether landlines are going away or not. I'd just like to know what options are available based on what I outlined. Even if what I'm looking for is deprecated, I'd still like to learn about it. Maybe I'll build my own central office
Quote from: Alex G. Bell on June 27, 2017, 03:03:39 PMWell actually this is not so. Polycom makes a series of SIP telephone sets which have much better than 3KHz BW and sound much better than a conventional telephone set. Of course this benefit only accrues when two such sets are used end-to-end.Carbon transmitters used in conventional passive telephone sets have very high inherent intermodulation distortion, so even an electret mike in a 3KHz circuit is vastly more natural sounding.
Quote from: bellsystem on June 27, 2017, 03:15:21 PMOkay, I'm done debating voice quality. The reality is VoIP does not support many of the things analog lines do - like dial-up, DSL, fax machines, alarm systems, pacemakers, etc. Landlines are extremely versatile and can be used for many different purposes. Plus pulse dialing is supported, which, considering we're on classicrotaryphones.com, is very important!Does anyone know what options I have for the scenario I have described? SIP and VoIP are out of the question. PRI would be my last resort.Thank you all for your input!