adnan@ico.isc.com (Adnan Yaqub) (07/08/90)
Could some kind body please point me to a suitable reference which describes the signaling between the main office and my home phone. I would like to know such things as how much power is provided, what the ring signal is like, how the click for call waiting is done, etc. Adnan Yaqub Star Gate Technologies, 29300 Aurora Rd, Solon, OH, 44139, USA, +1 216 349 1860 [...cwjcc!ncoast ...uunet!abvax ...ism780c ...sco ...mstar]!sgtech!adnan
varney@ihlpf.att.com (Al L Varney) (07/11/90)
In article <9506@accuvax.nwu.edu> sgtech!adnan@ico.isc.com (Adnan Yaqub) writes: >Could some kind body please point me to a suitable reference which >describes the signaling between the main office and my home phone. I >would like to know such things as how much power is provided, what the >ring signal is like, how the click for call waiting is done, etc. There is no true reference for this, since the answer depends on where you look at the subscriber loop; central office or customer end. There are no requirements I know of that mandate requirements on central office output viewed at the subscriber end of the loop. Essentially, central offices have "requirements" (with lots of exceptions) for inputs and outputs at the central office end of the loop, designed to work with various customer equipment over various loop distances/conditions. The primary "voluntary" requirement document for the central office switch today is the Bellcore LSSGR series, particularly, TR-TSY-000506, Signaling, (this might answer your "signaling" question) TR-TSY-000510, System Interfaces (here's the power and electrical stuff) TR-TSY-000515, Electromagnetic and Electrical Environment (lightning protection, EMI, etc. on the loop) TR-TSY-000522, Features Common to Residence and Business Customers III (Call Waiting is in here, & other Custom Calling stuff) Also of interest is an older publication, PUB 61100 Analog Voiceband Interface between the Bell System Local Exchange Lines and Terminal Equipment -- I believe this replaced with TA-NPL-000912, Compatibility Information for Telephone Exchange Service (order reference RFC 89-0007) There are a series of Technical Advisories (TA) that don't cost money, but Bellcore says they are distributed to "members of the telecommunications industry." The TRs above will cost about $200; they take plastic on (201) 699-5800. Ask about TAs, usually you have to write. Note that the output of a switch is not necessarily connected to your telephone, so don't make any assumptions about your end of the loop. There are Pair-gain, analog carrier, digital carrier, loop multiplex and range extension equipment that could sit between your switch and your telephone. They each have their own set of requirements for the telephone side of the subscriber "loop". Even if you knew the information today, it could change tomorrow, and no notice would be given. So long as the "standard" telephone works, the loop can change. So, let's say you found out all this stuff for YOUR TELEPHONE line and wanted to use the information in building an interface to the telephone system. Unfortunately, many manufacturers did this in the past, and were dismayed (or their customers were) to find that telephone lines are not the same everywhere, or even the same from day to day. The requirements on YOUR end of the loop are specified in the FCC part of the published Federal Regulations (47 CFR) Section 68. Any reasonable library should have a copy. This will give you power, ringing, timing and signaling requirements your equipment must meet. There are all kinds of requirements, including such things as (para. 68.318(c)1 -- "...Automatic dialing to a particular number must cease after fifteen successive attempts." Want to guess how many modems/terminal emulators violate this? Also check out EIA Standard RS-470, Telephone Instruments with Loop Signaling for Voiceband Applications. In summary, there is no detailed single reference, any library has general references (except for the Call Waiting signal) under the Telephony heading, and Section 68 details your equipment's allowed behavior for legal access. I don't believe the FCC has requirements for the switch interface, but the LSSGR documents the interface that most switches meet, and a lot of PUC rulings and court cases over many years probably define the telephone company's real legal interface to a particular customer. The opinions above are my own, the facts speak for themselves. Al Varney, AT&T Network Systems, Lisle, IL
hes@ccvr1.cc.ncsu.edu (Henry E. Schaffer) (07/20/90)
In article <9620@accuvax.nwu.edu> varney@ihlpf.att.com (Al L Varney) writes: X-Telecom-Digest: Volume 10, Issue 475, Message 9 of 9 >In article <9506@accuvax.nwu.edu> sgtech!adnan@ico.isc.com (Adnan >Yaqub) writes: >>Could some kind body please point me to a suitable reference which >>describes the signaling between the main office and my home phone. ... >There is no true reference for this, since the answer depends on where >you look at the subscriber loop; central office or customer end. ... However, there are some references which give quite a lot of info and which are a good place to start. One book which I have given to many people as a way to get started is: Understanding Telephone Electronics Developed and Published by Texas Instruments Learning Center J. L. Fike, et al 1983 Radio Shack catalog number 62-1388 I haven't checked lately to see if there is a new edition or even if it is still available. This is a self-teaching type of text with quizzes and answers for each chapter. henry schaffer n c state univ
mnc@us.cc.umich.edu (Miguel Cruz) (07/22/90)
In article 9970, Henry Schaffer writes: >Understanding Telephone Electronics >Developed and Published by Texas Instruments Learning Center >J. L. Fike, et al 1983 >Radio Shack catalog number 62-1388 > I haven't checked lately to see if there is a new edition or even if >it is still available. This is a self-teaching type of text with >quizzes and answers for each chapter. Well, I saw this book at Radio Shack not a year ago ... bought it, in fact. It's a paperback with a red cover. Most likely they still have it - Radio Shack is has one of the less dynamic stocking systems - They still have the disco traffic strobe lights. Miguel Cruz
jane@hpuxa.ircc.ohio-state.edu (Jane M. Fraser) (07/24/90)
>>Understanding Telephone Electronics >>Developed and Published by Texas Instruments Learning Center >>J. L. Fike, et al 1983 >>Radio Shack catalog number 62-1388 I (rather, my TA) tried very hard to get our local Radio Shack to get copies of this book for a class I am teaching this summer. We made it very clear that ten people would buy copies. We gave up and made photocopies of the whole book, something I hate doing. Jane Fraser
chip@chinacat.unicom.com (Chip Rosenthal) (07/25/90)
In article <10029@accuvax.nwu.edu> jane@hpuxa.ircc.ohio-state. edu (Jane M. Fraser) writes: >>>Understanding Telephone Electronics [...] J. L. Fike, et al 1983 >I (rather, my TA) tried very hard to get our local Radio Shack to get >copies of this book for a class I am teaching this summer. There is a newer edition available. Sams publishes it; I believe Rat Shak just puts their name on it. Sams can be contacted at 800-257-5755. However, for any telecom books, the Telecom Library is always a good bet. They are at 800-LIBRARY (or 212-691-8215). Chip Rosenthal chip@chinacat.Unicom.COM Unicom Systems Development, 512-482-8260
siegel@stsci.edu (07/26/90)
In <9970@accuvax.nwu.edu> "Henry E. Schaffer" <hes@ccvr1.cc.ncsu.edu> writes: > However, there are some references which give quite a lot of info >and which are a good place to start. One book which I have given to >many people as a way to get started is: >Understanding Telephone Electronics >Developed and Published by Texas Instruments Learning Center >J. L. Fike, et al 1983 >Radio Shack catalog number 62-1388 > I haven't checked lately to see if there is a new edition or even if >it is still available. This is a self-teaching type of text with >quizzes and answers for each chapter. I have looked for this book since it was mentioned here a few weeks back. I have not been able to find it. It is not listed in any current Radio Shack catalogs nor do they have it on the shelves. They some other books that have the same kind of information but I don't know how good these others are. Since I didn't know the catalog number that was used I didn't actually ask any of the salesfolk if it was available. Now that I have the catalog number I'll have to go back and ask. Does anyone have another source for this book should Radio Shack turn into a non-source? ==-->> Standard disclaimers applied. Your mileage will vary! <<--== Howard Siegel (301) 338-4418 TRW c/o Space Telescope Science Institute Baltimore, MD 21218 Internet: siegel@stsci.edu SPAN: STOSC::SIEGEL uucp: {arizona,decvax,hao}!noao!stsci!siegel