kaplanr@chaos.cs.brandeis.edu (Robert Kaplan) (02/20/90)
Funny you should ask. Brandeis University uses (617)736-2000 to
736-8999. Both "0" and "9" are used for other purposes from campus
phones ("1" is unused for any other purpose, but is presumably
available.) Just the other night I tried some random numbers of the
form 736-0xxx, 736-1xxx, and 736-9xxx.
0xxx and 1xxx returned "not in service messages," as did 90xx-93xx and
95xx-99xx. (at least the ones I tried). Any number of the form
736-94xx connected me with the Xerox Voice Exchange System, apparently
some sort of internal voicemail. Anyone know what that is?
Something similar was in use in Rochester NY a few years ago. The
University of Rochester used (716)275 2xxx-8xxx. 0xxx, 1xxx, and 9xxx
were available to customers in the town of Brighton. About 1982, the
university began moving to 5-digit dialing on campus, and the addition
of the 277 exchange. That allowed use of [27]5-0xxx, 1xxx, and 9xxx.
The non-university customers on those numbers were moved to the 461
exchange; so WWWG radio (275-9212) became 461-9212, for example.
Incredibly, at least according to someone I know who had a 275-9xxx
number, the change took place with *no notice whatsoever* to the
subscriber!
BTW, the phone # here for campus police [I just noticed this] is
PEnnsylvania 6-5000! :-)
A few other examples in NY State are:
The Rochester Institute of Technology uses just part of (716) 475; I
*think* from 475-2000 to 475-6999 (?). The rest of the exchange is
used in the northern part of the town of Henrietta [the part served by
the "Rochester" exchange {272, 424, 427 #s} and not the "Henrietta"
exchange {334, 359}].
SUNY Brockport uses (716) 395-xxxx; although they do not use all of
the numbers possible, there are no other users of that exchange -- other
Brockport customers get (716) 637-xxxx.
SUNY Geneseo uses (716) 245-xxxx; same situation there -- other Geneseo
customers get (716) 243-xxxx.
Cornell University uses (315) 787-xxxx for its agricultural
experimentation center in Geneva NY; as far as I know there is no one
else on 787 but them, although they do not use the whole exchange.
Other Geneva customers are 781- and 789-. Cornell also maintains
leased lines and allows toll-free calling between the experiment
station in Geneva and the main campus in Ithaca.
Most other Centrex users in Rochester Telephone land use parts of the
following "Rochester" exchanges: 222, 238, 253, 258, 263, 274, 292, 424,
427, 588, 722, 724, 726, 777, 781, 955, and 987. 253, 477, 588, 722,
and 781 are exclusively for Eastman Kodak's mammoth phone system,
which also uses large chunks of 722, 724, and 726.
777 is at present used only by Roch Tel itself; they just moved their
office phone #s there from 955 in 1988. 222 is the high-volume one
for the radio stations and such. The 1990 Roch Tel book also lists
255, 429, 957, and 959, which I suspect are Centrex exchanges as well.
428-xxxx is used exclusively by city and county government. Again,
they do not use 428-0xxx, 1xxx, or 9xxx. As far as I know, nobody
does.
One somewhat related question: It seems every year Roch Tel adds at least
5 new exchanges. If NYNEX is doing the same in its (Buffalo LATA) part
of 716, how far is 716 from an area code split? And will the Rochester
LATA get a NNX NPA? Yecch!
I'm getting nostalgic for 716 and it's not even gone yet!
There are no N1/0X exchanges in 716 yet, and dialing toll calls within
the area code is 1+7 digits. Last time I tried, Roch Tel wouldn't
allow 1+716+7 digits.
Scott Fybush
Disclaimer: This may not even be my own opinion.CER2520@ritvax.bitnet (Curtis E. Reid) (02/21/90)
>TELECOM Digest Tue, 20 Feb 90 00:49:08 CST Volume 10 : Issue 116 >The Rochester Institute of Technology uses just part of (716) 475; I >*think* from 475-2000 to 475-6999 (?). The rest of the exchange is >used in the northern part of the town of Henrietta [the part served by >the "Rochester" exchange {272, 424, 427 #s} and not the "Henrietta" >exchange {334, 359}]. RIT uses from 475-2000 to 475-7999 now since RIT switched over from Centrex to AT&T System 85 a couple years back. RIT still uses scores of 475-1xxx lines for private direct connections while the rest goes to business customers. Henrietta is an extremely large suburban town. It has three post offices that serves it: Main Rochester P.O., Henrietta and West Henrietta. Therefore, Henrietta has two C.O.s. The exchanges you mentioned above serves on one C.O. and the other exchanges you mentioned serves the other C.O. For tax purpose, we are Henrietta but that's where the line draws. Some addresses have Rochester as the city, other areas have Henrietta and my area has West Henrietta. Curtis Reid CER2520@RITVAX.Bitnet CER2520%RITVAX.Bitnet@cunyvm.cuny.edu (Internet) CER2520@vaxd.isc.rit.edu (Not Reliable-NYSernet)
dross@fluffy.cs.wisc.edu (Danthe Man with the Plan Ross) (02/22/90)
In article <4112@accuvax.nwu.edu> djcl@contact.uucp (woody) writes: X-Telecom-Digest: Volume 10, Issue 115, message 8 of 11 >Several years ago, the University of Toronto used a Centrex that took >up most of the 978 exchange. However, since extensions couldn't start >with 9 (dial 9 to get local dial tone), there was a gap in the 978 >exchange that was used for automatic mobile phone service (ie. The University of Texas at Austin uses the entire 471 exchange for on-campus offices and departments. The student dorms, however, are on part of the 495 exchange. Intracampus calls are made by the last _5_ digits, so there are numbers of the form 471-9XXX. The dorm "exchange" includes 495-5XXX and 495-3XXX and possibly more. The gap here is more due to not that many student dorm rooms than technical reasons. Many departments have internal systems which allow 4- or 3-digit numbers (which usually, but not always, are the XXXX). The off-campus research labs are tucked away in a north Austin exchange. The campus phone system includes call waiting (which you CAN'T turn off--solution was to "forward" calls to a nonexistent 5-XXXX number, say, 5-8XXX, which gave caller a fast busy signal), 3-way calling, and call forwarding on dorm lines, and more on office lines. The fun arises when you dial a number 495-XXXX from on campus; unless you know someone lives in the dorm, you just have to try it: 9-495-XXXX or 5-XXXX. (There are state and city offices, as well as a cookie store (!) on 495-XXXX.) And the wrong one will not work! However, the "Please check the number and dial again" recording had been read in a most lengthy and dramatic manner by a woman with a British accent, so it was quite pleasant to just sit there and listen to her repeat it over and over. 8-) Dan Ross dross@cs.wisc.edu
dave%westmark@uunet.uu.net (Dave Levenson) (02/23/90)
In article <4112@accuvax.nwu.edu>, djcl@contact.uucp (woody) writes: > Several years ago, the University of Toronto used a Centrex that took > up most of the 978 exchange. However, since extensions couldn't start > with 9 (dial 9 to get local dial tone), there was a gap in the 978 > Perhaps there are other examples of the -9xxx gap where Centrex, or > other direct-dial extension systems are used out there... Most Centrex groups use less than a full 10,000 numbers, and so there are ordinary subscriber lines with numbers having the same prefix. The 0xxx and 9xxx groups are generally not assigned to centrex, so as to provide attendant and 'outside' access. Sometimes there are other centrex groups with the same prefix, but members of one group must dial 9+ 7 digits to reach members of the other. Remember, a centrex is generally not a physical switch, it's a software-defined group of lines (with a group of numbers) which subscribe to a special group of features. Dave Levenson Voice: (201 | 908) 647 0900 Westmark, Inc. Internet: dave@westmark.uu.net Warren, NJ, USA UUCP: {uunet | rutgers | att}!westmark!dave [The Man in the Mooney] AT&T Mail: !westmark!dave
dritchey@ihlpb.att.com (Donald L Ritchey) (02/28/90)
In article <4365@accuvax.nwu.edu>, dave%westmark@uunet.uu.net (Dave Levenson) says: X-Telecom-Digest: Volume 10, Issue 128, Message 7 of 12 > In article <4112@accuvax.nwu.edu>, djcl@contact.uucp (woody) writes: >> Perhaps there are other examples of the -9xxx gap where Centrex, or >> other direct-dial extension systems are used out there... > Most Centrex groups use less than a full 10,000 numbers, and so there > are ordinary subscriber lines with numbers having the same prefix. > The 0xxx and 9xxx groups are generally not assigned to centrex, so as > to provide attendant and 'outside' access. Sometimes there are other > centrex groups with the same prefix, but members of one group must > dial 9+ 7 digits to reach members of the other. Here at Bell Labs in Indian Hill, Naperville, our CENTREX groups use all 10,000 numbers in the 708-979-xxxx range (my number is in there) as well as part of 708-713-xxxx, but we use prefix codes to distinguish between the extensions and the services that seem to conflict. For extensions, we dial 3xxxx or 9xxxx. For operator, we dial *0 (versus just 0) [left over from the days when we only had 4-digit dialing and one prefix]. For outside line, we dial *9 (versus just 9) [see previous comment]. Since most CENTREX services are based on modern digitally controlled switches, the dialing plan used for CENTREX is usually customized to some extent based on the needs of the customer. The customer can specify the needs of the application, and someone from the Telco business office gets the task of making it work. - You want 4-digit extension dialing, if you have less than 10,000 lines, you can get it. - You want 4-digit extension dialing, and you have more than 10,000 lines, then something has to give. Either you can't dial everyone with extension dialing (make outside calls to the other lines not on the same prefix (NXX)) or you go to 5-digit extensions. We did the later here. All of CENTREX is a compromise between what the customer wants done (usually pretty standard to minimize learning curves of new users) and what the Central Office switch can handle. Some switches are more flexible than others, but someone with experience in comparing different vendors offerings will have to assess which switch is "best". That is not something for the casual observer. #include <std/disclaimer.h> Don Ritchey dritchey@ihlpb.att.com or don.ritchey@att.com AT&T Bell Labs, Room IH 1D-409, Naperville, IL 60566, (708) 979-6179 :-) The advice you get here is worth all that you paid for it. :-)