dave%westmark@uunet.uu.net (Dave Levenson) (09/06/90)
A customer has a loop-start CO line (it happens to be the first in a
small hunt-group) where outgoing service is normal. On incoming
calls, the caller hears the ringback tone, but no ringing voltage at
all is delivered to the line. Listening with a butt set (in monitor
mode) when an incoming call is attempted, one hears absolutely nothing
... no clicks, no tones, and no ring power. But switch to talk mode,
and you answer the incoming call and can converse with the caller. If
the first line is in use, calls hunt to other members of the group,
and those lines ring normally. I wonder if the CO is administered
with none of the possible ringing options selected? (No, it's not tip
party, it's not ring party, it's not bridged ringing, etc. None of
the above? Don't ring at all!)
The CO is probably a digital time-division switch of some kind, as
there are no audible clicks or loop current interruptions when calling
out. The access code is 516-234. The customer's site is in Central
Islip, New York (which is on Long Island).
Has anybody ever heard of this failure mode? Does anybody know the
type of CO used by New York Telephone in those parts?
The telco has promised to have somebody out today to look at the
problem. I suggested to the repair bureau agent that they ought to
look at the CO first, as the loop works normally for outgoing service,
but what do _I_ know about it?
Dave Levenson Voice: 908 647 0900 Fax: 908 647 6857
Westmark, Inc. UUCP: {uunet | rutgers | att}!westmark!dave
Warren, NJ, USA AT&T Mail: !westmark!daveDREUBEN@eagle.wesleyan.edu (DOUGLAS SCOTT REUBEN) (09/07/90)
In response to Dave Levenson's posting about (what I believe) is the 516-234 exchange, I think it's a 5ESS. It is in the Brentwood/Ronkonkoma area, and it serves LOTS of exchanges, like 230-234,273, 348, 434-436, and 582. (I think there are supposed to be 2 more, but they are not listed in the book or the recording, so either they are planned or I'm just misinformed.) (Probably the latter! :-) ) You can always call NYTel and ask them - they used to NEVER tell you what sort of switch you were on, but they seem to have become less paranoid and more progressive, and will now freely discuss equipment types, cut-over dates, etc with you at length. (Other Bells, such as, ahem, Pac*Bell, well, it's a different story with them...!) Hope this helps, Doug dreuben@eagle.wesleyan.edu dreuben@wesleyan.bitnet
larry@uunet.uu.net (Larry Lippman) (09/09/90)
In article <11794@accuvax.nwu.edu> dave%westmark@uunet.uu.net (Dave Levenson) writes: > A customer has a loop-start CO line (it happens to be the first in a > small hunt-group) where outgoing service is normal. On incoming > calls, the caller hears the ringback tone, but no ringing voltage at > all is delivered to the line. Listening with a butt set (in monitor > mode) when an incoming call is attempted, one hears absolutely nothing > ... no clicks, no tones, and no ring power. But switch to talk mode, > and you answer the incoming call and can converse with the caller. > The CO is probably a digital time-division switch of some kind, as > there are no audible clicks or loop current interruptions when calling > Has anybody ever heard of this failure mode? Assuming that it is a digital CO, the ringing control is provided directly by the subscriber loop interface circuit. Since ring control circuitry is unique to each line, a failure mode can exist which affects only a single line. Failure of the ring control switching element (could be either solid-state or a relay, depending upon the type of CO apparatus) that switches the ring conductor battery feed between -48 volts and -48 volts superimposed upon 20 Hz ringing could cause the *exact* problem you are describing. > I wonder if the CO is administered > with none of the possible ringing options selected? (No, it's not tip > party, it's not ring party, it's not bridged ringing, etc. None of > the above? Don't ring at all!) My intuition is that it is a simple hardware failure as described above, and not an administration error. Besides, in most if not all digital CO apparatus, party line control requires a subscriber line interface card which is *different* from than that used for regular single-party service. Since it is not likely that such a card would be furnishing service to the above single-party subscriber, such an administration error is most likely physically precluded. Larry Lippman @ Recognition Research Corp. "Have you hugged your cat today?" {boulder||decvax||rutgers||watmath}!acsu.buffalo.edu!kitty!larry VOICE: 716/688-1231 || FAX: 716/741-9635 {utzoo||uunet}!/ \aerion!larry
asd@mtqua.att.com (Adam Denton) (09/11/90)
In article <11794@accuvax.nwu.edu>, dave%westmark@uunet.uu.net (Dave Levenson) writes: > [Dave Levenson is inquiring about a CO switch not delivering ring voltage] > The access code is 516-234. The customer's site is in Central > Islip, New York (which is on Long Island). > Has anybody ever heard of this failure mode? Does anybody know the > type of CO used by New York Telephone in those parts? The switch is a 5ESS. I don't know the generic. You can get the scoop on what exchanges it serves by calling 234-9901 (in area code 516). Most of NYTel's COs can be inquired by dialing NNX-9901 (I think). One time when I was in Hauppauge (right next to Central Islip), and just for fun, I tried 234-9902 (actually it may have been 582-9902). Surprise! I got the most bizarre tone I have ever heard on a phone line. I figured it was some kind of funky second dial tone, so I dialed some more digits. I waited, and someone came on the line and said (in an annoyed voice): "You are dialing on the INTERCOM! If you don't know what you are doing, PLEASE read the INSTRUCTIONS!!" and then they hung up. So I guess you can dial the CO intercom system from outside the switch! Maybe some day, I'll call up one day and have a nice chat with some of the CO personnel. Maybe... :-) Live and learn!! Adam Denton asd@mtqua.att.com
johns@scroff.uk.sun.com (John Slater) (09/12/90)
In article <12017@accuvax.nwu.edu>, asd@mtqua.att.com (Adam Denton) writes: |> One time when I was in Hauppauge (right next to Central Islip), and |> just for fun, I tried 234-9902 (actually it may have been 582-9902). |> Surprise! I got the most bizarre tone I have ever heard on a phone |> line. I figured it was some kind of funky second dial tone, so I |> dialed some more digits. I waited, and someone came on the line and |> said (in an annoyed voice): |> "You are dialing on the INTERCOM! If you don't know what you are |> doing, PLEASE read the INSTRUCTIONS!!" |> and then they hung up. So I guess you can dial the CO intercom system |> from outside the switch! Maybe some day, I'll call up one day and |> have a nice chat with some of the CO personnel. Maybe... :-) The number is definitely 516-582-9902. After the above article, I couldn't resist dialling, even at transatlantic rates. I got a peculiar tone (a bit like UK ringing tone), then silence. I said "Hello" a few times and heard nothing. I decided to hang on for a while, intermittently humming to myself and saying "hello". After about thirty seconds a *very* irritated voice came on the line and said "What do you want?!". Rather than irritate him further, I hung up. I guess it's a fairly stupid idea to have a dial-in intercom system in the first place, so my sympathy level is low. John Slater Sun Microsystems UK, Gatwick Office