CA1295750C - Terminal switching unit for a plurality of maintenance systems - Google Patents
Terminal switching unit for a plurality of maintenance systemsInfo
- Publication number
- CA1295750C CA1295750C CA000551255A CA551255A CA1295750C CA 1295750 C CA1295750 C CA 1295750C CA 000551255 A CA000551255 A CA 000551255A CA 551255 A CA551255 A CA 551255A CA 1295750 C CA1295750 C CA 1295750C
- Authority
- CA
- Canada
- Prior art keywords
- switching
- intelligent terminal
- processor unit
- commands
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/20—Testing circuits or apparatus; Circuits or apparatus for detecting, indicating, or signalling faults or troubles
- H04Q1/22—Automatic arrangements
- H04Q1/26—Automatic arrangements for signalling trouble in unoccupied sub-exchanges
Abstract
A TERMINAL SWITCHING UNIT FOR A PLURALITY OF
MAINTENANCE SYSTEMS
ABSTRACT OF THE INVENTION
A system is shown for interfacing between a work station or intelligent terminal device and a number of maintainable telecommunication systems. The system provides for interfacing between an intelligent CRT
terminal and up to 26 remotely located maintenance processor units. This system provides the CRT attendant or crafts person with the ability to trouble-shoot or perform diagnostic testing upon a maintenance processor unit which is remotely located. In addition, the work station or intelligent terminal may be remotely located from the interface circuitry. This system establishes a connection between the work station or intelligent terminal and a particular maintenance processor unit.
Once that connection is established, the maintenance processor unit of that telecommunications system reports diagnostic and trouble-shooting type information. This system also provides for manual reset and self test capabilities. This system provides for a variable BAUD
rate which may be preprogrammed into a microcontroller device.
MAINTENANCE SYSTEMS
ABSTRACT OF THE INVENTION
A system is shown for interfacing between a work station or intelligent terminal device and a number of maintainable telecommunication systems. The system provides for interfacing between an intelligent CRT
terminal and up to 26 remotely located maintenance processor units. This system provides the CRT attendant or crafts person with the ability to trouble-shoot or perform diagnostic testing upon a maintenance processor unit which is remotely located. In addition, the work station or intelligent terminal may be remotely located from the interface circuitry. This system establishes a connection between the work station or intelligent terminal and a particular maintenance processor unit.
Once that connection is established, the maintenance processor unit of that telecommunications system reports diagnostic and trouble-shooting type information. This system also provides for manual reset and self test capabilities. This system provides for a variable BAUD
rate which may be preprogrammed into a microcontroller device.
Description
1;2957S~
~he pr~ent invention pertains3 to ma~ntenancl3 o~
5 ~eleco~ununication swi'l:ching an~ ~ransmi~ion system~ and more particularly ~o re~ote morli~orirlg ~lld a~ce~s o~ a num~Hr o~ maintainable el ectrollic ~;wit~h~ng and trans-mi~sion ~y~em~ ~rom a ;:entralize~ int~lligent ~ in~
or work station.
~ypically, ~wi~chin~ and tr,an~mi~s~on sy~em~ re~-quire a crafts person to b~ phys ic:ally pre~ent at th~
site o~ thq eguipment to p~rfor3n maint~nance te~ anr3 s~atus cheak~- Having a cra~ts ]Der~on travel ~o ea~h o~
the sites o~ ~he ~ipment i~; expen3ive . For ~itua~ionei in ~rhic}~ largo amount~: ~f e~uipmen~ exi~, sev~ral crar~s people may be required in order lto e~ tiv~ly monitox all thea equipmen~. 'rhis type o~ arra~gem~ant en~ails ~u~h travel by the ora~t~: per~on, along with tran~portinq the re~uired int~ar~ace and te~;t ~uipment.
~he pr~ent invention pertains3 to ma~ntenancl3 o~
5 ~eleco~ununication swi'l:ching an~ ~ransmi~ion system~ and more particularly ~o re~ote morli~orirlg ~lld a~ce~s o~ a num~Hr o~ maintainable el ectrollic ~;wit~h~ng and trans-mi~sion ~y~em~ ~rom a ;:entralize~ int~lligent ~ in~
or work station.
~ypically, ~wi~chin~ and tr,an~mi~s~on sy~em~ re~-quire a crafts person to b~ phys ic:ally pre~ent at th~
site o~ thq eguipment to p~rfor3n maint~nance te~ anr3 s~atus cheak~- Having a cra~ts ]Der~on travel ~o ea~h o~
the sites o~ ~he ~ipment i~; expen3ive . For ~itua~ionei in ~rhic}~ largo amount~: ~f e~uipmen~ exi~, sev~ral crar~s people may be required in order lto e~ tiv~ly monitox all thea equipmen~. 'rhis type o~ arra~gem~ant en~ails ~u~h travel by the ora~t~: per~on, along with tran~portinq the re~uired int~ar~ace and te~;t ~uipment.
2 0 Wit~ the advent of work sta~ions a~ intelligent te~minal device~; ~ communic:atiorl~ between the~3~ work ~ta~
tions or int~ gent t~mlnal~; and other wo~ ~tations, in~elligent te~minal~ or d~vlc:es i5 gr~atly faaili~at~d via tellephone line~. Th~r~fora, it i~3 a~vant2lgeou~ for a single ~ource ~o ~,onitot a nu~b~r o~ mainta~able switch-ing and tran~mission Yyst~am~.
Accordingly, it is an object o~ th~ present inven~
tion to provida an inter~ac~ b~twlsen a ~ingl~ worlc sta-tion or an int&lligen~ e~minal and a num~ar of ~ai-3 0 tainable telecommunicatiorl ~qy~t~m~ .
A t~r~inal ~witchin~ unit ~or a plurality of mainte-nance BySt~ ha~ a intelligerl~ terminal, a numb~r o~
maintenance proce~:sor unit~3 residing in t2ansmission an~
3 5 swi~chin~ ~y~tem~ and a ~witchin~ arxangemen~ connected between ~he int~lligent ~erminal and ~h~ mairltenance~ pro-cessor units. ~rhe intelligent term$nal tran mit~ om m~ndæ and re¢ei~eg: data for di~pl~y. Æach ~witc~ng and ~transmission sy~;te~m includeæ one corr~sponding ~ainte nanCQ pro~R~sor ~mit. Ea~h ~aintenan~e proc:~s30r ~it operates to gathl3~ and to ~r~næmit data and also to per- ~k 40~1l di~gnostic te~;~ing.
. ~ . 1 ",",, .
S~.5 ~ he ~witahing ar~rang~m~nt an~lyze~ a com~n~ frc~
the intelli~ent terntin2l1 an~ deter~ine~: which partlcula~
m~intenan~ p~oce~or un~t has bezn s~lec:t~CI~ Thi~
maintenance proce~sor unit is ~hen c:onn~ted to t~e 5 swit~h~ng arrangement. Th~ ~witching ~rrAng~nt ~acili-tate-~ th~3 trans~er ~7~ da.ta from the ~a~n~enance pro~es~or unit ~el~c:ted to the intelligen~ terminal ~or dl~pl~y.
In addition, ~h~ swit~hing arr~nge~4ent al~o ~ran~-mits a ~o~mand to the ~intenance processor unit to pe~-10 form ~iagnos~ic tes~ing. Af~er l:he maintenanc:e proces~4runit ~as per~orm~d the dlagno~tia teæl:in~, ik transmit;s the resultant dat~ to the s~itchlng ~rrangemen~ ~or ~ub~
~equen~ di~play on the intelligent ~3rminal.
Fl~u~e 1 i~ a blc~k ~iagra~n of a re~o~ m~lntenance ~ys~tem.
Figure 2 i~ a 1: lock ~.iagra~ of the CRT ~;witching unit OI ~igure 1.
Ft gure 3 i~: a lay out o~ the f~ce plate o~ t~e CRT
20 ~witching unit printed wiring ca~rd~
Fl gure 1 depicts a tex~inal gwitchin~ unit ~or a plurality o~ maintenance sy~qt~m~ A lo~:al ~T ~intel-ligent terminal or wo~k station~ is shown connecte~ to 25 the CRT ~wit~hing ~it (CSU). Tlle re~note c~r ls Rhown connected ~nrough mod~n 40 and ~hrough modem 30 ~o ~he CSU. ~h~ remo~e cPcrr i~: also an irltelligen~ te~minal or work ~t~tion.
Ih~ CSU i~ conn~cted ks~ u~ to ~ maintenanc:e proces-30 sor units~ ~NPlJ~). T~e MPU~ are ~3y~emR which r~asid~ ineither switchillg or tranRmi;sion ~tern~ he M~i pro-vide ~or maint~na,nc:e and di~gnostia interfac~ with ea~:h o~ the a~sociated ~wi~ hi~g and ~rans~ ion ~yste~3.
The CSU ~nay conneal: the local CRT or thla re~o!:e ~ to 35 any o~ ~e 2~ MPU~. An attendan~ or cra~ p~r~;~n at the local or re~o~3 CRT may via input com~and~ ~rouble-&ho~t or per~orffl ~diagno8tic te~ing c3n any o~ th~ witahing or trans~nis~ion 5y~1~Qm8~ having an ~PU. The ~SU allow~ the at~endant at ~ RT to obtain ~;tatu~ info~m~tlon o~ any 40 part~cular switohing or tr~nsmi~ion sy~tem..
once the ~SU establi~he~ a conn2~tion between a CR~
and the ~SPU ~r a given ~witahing or transntission ~ystem, 12~S7~) t:~e MPU of that sye~em o~er~e~ ~he repor~ing o~ ~ain~e-nanc~ and diagno~tic clata to the CSU. ~he C~U then facilitat~ t~ans~r of thQ data between the MPU and eithe~ ~f t~e CRT~.
~he ~SU allow~ s~lection o~ any o~ th~ 2 ~ MPUs by eith~ar th~ loc2~1 CRT or the remote ~ h~ C~U in-ter~aca~ between a ~elect2d MPU and the xamote CR~ via modems 30 and 40u Al~ th63 inpu~ n~ ou~pul~3 to and ~rom t~e CSU, excap~ poweX and elec::tri ::al ground, ~re EIA
~tandard R~-~32~ 3erial intlar~ac6~ gignale;. ~he C8U pro-vide~; a variabl~ BAU~ r~e ~or inter~acing ~o ~pecial I~O
devices. ~he B~UD ratQs ar~ preprogra~me~ into t-he c~;U
-Ro~tware and may be ~ate~ o~ 300 a~UD or more. In addi-tion, the CSU includes hardware for ~ st aLnd r~at-ting ~unc~ion6.
Fig~re 2 is a block diagram o~ the ~SU s~rit~hin~r unit. The heart o~ the switching unit iR the micro controller 200. Th~ microc:ontroller 20~ may be i:nple~
mented w~th an Intel device part no. 8031. Intel ls a 2 o regist~r trademark o~ the Intel CorporaLtion.
The cSU circ:ui~ry i5 impl~men~ on one phy~i~al printed ~irin~ car~. ~hi card may be plugged into sl:andard switchin~ and transmis~eion ~yBtem aard ~
ThiB printed ~iring card has a ~ace plate, 8hOWn in Pigure 3 . Vario~ connectionE~, Z;witche~3 ~n~ indi~ator lampq are inc:orporated on the ~aoe pla~e .
~nput ~nd output ~rom the lo~:al CR~ is tran~mi~ted U~RT 230. Input ~nd outpu ~rom the re~otQ CRT i~ via modem 3 0 and ~ o arld the remote lea~ o~ U~ ~ 3 ~ . UA~
230 i~ a univer~al a~:ynchronous r~acel~rer/tran-~mitter.
The~Q ~ nput commat~ds are transmitte~ ~ria the data ~u~
(D0-D7) ~ microcon~oller 200. U~R~ 230 ~nay }~
ple~nented with an Int~l ~evice part s~o~ 8~74, multl-protoaol ~erial ~ontrol devi::e. ~icrocontrc~ r 200 i~
connec:ted via a ~direc:tional link ~18 to relays 220.
~elays 220 ~el~c~ a ~:onnec~ion ~o on~ of the 26 ~
M~crocontroll~r ~00 is çonne~te~ to latahes 205.
Latches 205 operate ~o latGh an outpu~.memory addre~.
~he bidir~ctlonal data bu~3 r)o-D7 connect~; both ~ ~lo and EPRON 212 to m~croc:on~rolle~ 200. Mi~roc~ntr~ller 200 is connected 'co ~A~ 210 via the addre~ lou~
,, j, .3~ 2~S7~
leadE; Ao ~hrough All. M~croaontr~lle~ 00 i~ al~o con-necteâ ~o ÆiPRO~ 2î2 vi~ 2,ddr~as~ ~us lez~d~ AO through A13.
RAM 210 i~; a ranclo~ aca~ss memory devi~e pro~idiny a 2K
by ~-bit me~ory. EPiP~OM 212 is a~ ~le~tr~nic:ally p~o-gram~able xead only memory o~ size 8X b~ 8-bits.
Timer 245 is ~onne~ted to UA~ 230, ~i~r~cont~oll~r 2~0 ~n~l to cloak 240~ Timer 245 ~ay bs implemented with an In~el programmable inter~ral ~imer par~ no. 8~54.
The clock 240 drive~ all ~ihe ~iming ~unation~i of ~S~ he ~loak i~ss connea~ed. ~o miaro~ontrs:~ller 200, to timer 245, to UA~T 230 and to w;3.~ch dog ~m~r 242. ~he cloalc provide~ a ~reguen~:y o~ ~pproxima~ly ~1, 05 m~hert:z.
DC to D~ conv~rker ~70 prollide~ all pow~r to ~his 1~ circuit a~ w~ll a~ ~or illu~inati~g the lamp in~l¢ators on the ~a~e plate via a conne~ion ~o thq LED~ Z50. Th~
DC to DC ~onverter 270 will t~ke e1ther -48 volt~ or -24 volts as an input and provide ~12 Yolt~ volt: and ~5 volts as outputs.
The LE~S 250 and the swi~c:h~ 0 a~e c:o~n~c~ed to the miorocon~oller 200. The microcon~ollqr 200 serves to liqht or extingui~h each o~ th~ ht emitting ~iode~
~lamps) ~50. ~wit~he~ 2~ 3er~ to inpu~ variq~ func-tions ~o microcontroller ~00. The~e ~unction inclu~ed self te~t and goneral ~eset unction~7 ~e looal CRT i ~onneated to UART ~ 3 0 via the lo~al CRT lea~ e re~o~e C~T vi~ mode 30 i~ conne~te~ to mod~m ~0 w~th modem 40 oon~c e~ to U~R~ ~30 vi~ th~ re-mote CRT lea~. Each o~ the M~Us i~ conne~ted to relays 2~0 via a ¢o~re ponding lead MPU1 ~hrou~h MPU26.
COm~RndS are input ~ro~ the lo¢a} or re~ot~ CRTs t~
U~R~ 230. Th~e c~mmands are trans~erred f~o~ UART 230 vi~ the data ~u~ DO-D7 to microco~rolle~ ~00. The~, micro~ontroll~r 200 a~alyzes the commandO ~i~ro~on-troller 200 det~rmin~s whi~h MPU 1~ r~este~ by ~he ~ummand an~ c~nnects t~ that ~PU ~ia r~lays ~20. When th~ partioular ~P~ re~pond~, the re~pon~e i~ ~ran~ ed ~hrough rel~y-~ 2~0 vi~ the bidirection~l lîn~ 218 ~o mi~roco~troll~r 200~
35i7~
EPROM 212 contains the operating firmware for microcontroller 200. RAM memory 210 is a scratch pad data area for receiving and holding data transmitted by an MPU to the CSU.
When RAM memory 210 has been filled with MPU data, microcontroller 200 will transmit a message to the MPU, catlsing the MPU to cease transmitting any more data, until RAM memory 210 has available storage.
Microcontroller 200 displays the data transmitted received from an MPU upon the CRT which had made the request.
Then, the MPU will control sending all requested data, until this data has been sent to the CSU and displayed upon the appropriate CRT.
Timer 245 is a microcomputer peripheral device which supports asynchronous, byte synchronous and bit æynchronous protocols. Asynchronous communication protocols are used by the CSU during its interface with the CRTs. Timer 245 supports two receiver/transmitter channels. One channel supports the local CRT
and the other channel supports the remote CRT.
Clock 240 drives the other various timing functions of the CSU. These functions include the microcontroller, timer 245, UART 230, and watch dog timer 242. The watch dog timer circuitry 242 is located on the CSU printed wiring card and provides a circuit which must be reset by the microcontroller 200 software every 42 milliseconds. Failure of the microcontroller 200 software to reset the watch dog timer circuitry will result in a watch dog time-out. As a result of the watch dog time-out, watch dog circuit 242 will issue a reset signal to microcontroller 200 and to associated latching circuitry. This condition will also cause the local alarm lamp LED (Light Emitting Diode) to be turned-on. This local alarm lamp~ along with other lamps, switches and a connector9 are located on the face plate of the CSU
printed wiring card, shown in Figure 3.
LEDs 250 includes the local alarm LED mentioned above.
In addition, LEDs 250 include an active lamp, a modem lamp and a power on lamp. The active lamp indicates that the CSU is in ~L~9~7S~) active operation. The signal lighting thls lamp i8 generated by software command during normal CSU operation. The modem lamp indicates that the modem yort of the CSU is in use. Thls signal is generated by software of the CSU, when it is interfacing with the remote CRT via the modems. The power on light indicates that each of the three voltages (-~12 volts, -12 volts and +5 volts) is being provided to the CSU. The power on light is turned-off when the +5 volt or ~12 volt power supply is reduced to a ~ero voltage level or when the -12 volt power supply drops below a -6 volt level.
Switches 260 are momentary pushbutton switches for reset and self test functions. The reset pushbutton causes microcontroller 200 and associated latching circuitry to be reset.
The self test pushbutton enables the microcontroller 200 to perform predefined self test routines in response to an interrupt signal generated by pushing of the self test pushbutton.
The DC to DC converter 270 produces -~12 volts, -12 volts and ~-5 volts from either a -48 volt source or a -24 volt source.
Figure 3 depicts the CSU face plate. Four lamps or LEDs are shown for each of the above mentioned functions. In addition, two momentary pushbutton switches and a 25 pin RS-232-C
connector for connecting the local CRT to the CSU are shown.
Although the preferred embodiment of the invention has been illustrated, and that form described in detail, it will be readily apparent to those skilled in the art that various modifications may be made therein without departing from the spirit of the invention or from the scope of the appended claims.
tions or int~ gent t~mlnal~; and other wo~ ~tations, in~elligent te~minal~ or d~vlc:es i5 gr~atly faaili~at~d via tellephone line~. Th~r~fora, it i~3 a~vant2lgeou~ for a single ~ource ~o ~,onitot a nu~b~r o~ mainta~able switch-ing and tran~mission Yyst~am~.
Accordingly, it is an object o~ th~ present inven~
tion to provida an inter~ac~ b~twlsen a ~ingl~ worlc sta-tion or an int&lligen~ e~minal and a num~ar of ~ai-3 0 tainable telecommunicatiorl ~qy~t~m~ .
A t~r~inal ~witchin~ unit ~or a plurality of mainte-nance BySt~ ha~ a intelligerl~ terminal, a numb~r o~
maintenance proce~:sor unit~3 residing in t2ansmission an~
3 5 swi~chin~ ~y~tem~ and a ~witchin~ arxangemen~ connected between ~he int~lligent ~erminal and ~h~ mairltenance~ pro-cessor units. ~rhe intelligent term$nal tran mit~ om m~ndæ and re¢ei~eg: data for di~pl~y. Æach ~witc~ng and ~transmission sy~;te~m includeæ one corr~sponding ~ainte nanCQ pro~R~sor ~mit. Ea~h ~aintenan~e proc:~s30r ~it operates to gathl3~ and to ~r~næmit data and also to per- ~k 40~1l di~gnostic te~;~ing.
. ~ . 1 ",",, .
S~.5 ~ he ~witahing ar~rang~m~nt an~lyze~ a com~n~ frc~
the intelli~ent terntin2l1 an~ deter~ine~: which partlcula~
m~intenan~ p~oce~or un~t has bezn s~lec:t~CI~ Thi~
maintenance proce~sor unit is ~hen c:onn~ted to t~e 5 swit~h~ng arrangement. Th~ ~witching ~rrAng~nt ~acili-tate-~ th~3 trans~er ~7~ da.ta from the ~a~n~enance pro~es~or unit ~el~c:ted to the intelligen~ terminal ~or dl~pl~y.
In addition, ~h~ swit~hing arr~nge~4ent al~o ~ran~-mits a ~o~mand to the ~intenance processor unit to pe~-10 form ~iagnos~ic tes~ing. Af~er l:he maintenanc:e proces~4runit ~as per~orm~d the dlagno~tia teæl:in~, ik transmit;s the resultant dat~ to the s~itchlng ~rrangemen~ ~or ~ub~
~equen~ di~play on the intelligent ~3rminal.
Fl~u~e 1 i~ a blc~k ~iagra~n of a re~o~ m~lntenance ~ys~tem.
Figure 2 i~ a 1: lock ~.iagra~ of the CRT ~;witching unit OI ~igure 1.
Ft gure 3 i~: a lay out o~ the f~ce plate o~ t~e CRT
20 ~witching unit printed wiring ca~rd~
Fl gure 1 depicts a tex~inal gwitchin~ unit ~or a plurality o~ maintenance sy~qt~m~ A lo~:al ~T ~intel-ligent terminal or wo~k station~ is shown connecte~ to 25 the CRT ~wit~hing ~it (CSU). Tlle re~note c~r ls Rhown connected ~nrough mod~n 40 and ~hrough modem 30 ~o ~he CSU. ~h~ remo~e cPcrr i~: also an irltelligen~ te~minal or work ~t~tion.
Ih~ CSU i~ conn~cted ks~ u~ to ~ maintenanc:e proces-30 sor units~ ~NPlJ~). T~e MPU~ are ~3y~emR which r~asid~ ineither switchillg or tranRmi;sion ~tern~ he M~i pro-vide ~or maint~na,nc:e and di~gnostia interfac~ with ea~:h o~ the a~sociated ~wi~ hi~g and ~rans~ ion ~yste~3.
The CSU ~nay conneal: the local CRT or thla re~o!:e ~ to 35 any o~ ~e 2~ MPU~. An attendan~ or cra~ p~r~;~n at the local or re~o~3 CRT may via input com~and~ ~rouble-&ho~t or per~orffl ~diagno8tic te~ing c3n any o~ th~ witahing or trans~nis~ion 5y~1~Qm8~ having an ~PU. The ~SU allow~ the at~endant at ~ RT to obtain ~;tatu~ info~m~tlon o~ any 40 part~cular switohing or tr~nsmi~ion sy~tem..
once the ~SU establi~he~ a conn2~tion between a CR~
and the ~SPU ~r a given ~witahing or transntission ~ystem, 12~S7~) t:~e MPU of that sye~em o~er~e~ ~he repor~ing o~ ~ain~e-nanc~ and diagno~tic clata to the CSU. ~he C~U then facilitat~ t~ans~r of thQ data between the MPU and eithe~ ~f t~e CRT~.
~he ~SU allow~ s~lection o~ any o~ th~ 2 ~ MPUs by eith~ar th~ loc2~1 CRT or the remote ~ h~ C~U in-ter~aca~ between a ~elect2d MPU and the xamote CR~ via modems 30 and 40u Al~ th63 inpu~ n~ ou~pul~3 to and ~rom t~e CSU, excap~ poweX and elec::tri ::al ground, ~re EIA
~tandard R~-~32~ 3erial intlar~ac6~ gignale;. ~he C8U pro-vide~; a variabl~ BAU~ r~e ~or inter~acing ~o ~pecial I~O
devices. ~he B~UD ratQs ar~ preprogra~me~ into t-he c~;U
-Ro~tware and may be ~ate~ o~ 300 a~UD or more. In addi-tion, the CSU includes hardware for ~ st aLnd r~at-ting ~unc~ion6.
Fig~re 2 is a block diagram o~ the ~SU s~rit~hin~r unit. The heart o~ the switching unit iR the micro controller 200. Th~ microc:ontroller 20~ may be i:nple~
mented w~th an Intel device part no. 8031. Intel ls a 2 o regist~r trademark o~ the Intel CorporaLtion.
The cSU circ:ui~ry i5 impl~men~ on one phy~i~al printed ~irin~ car~. ~hi card may be plugged into sl:andard switchin~ and transmis~eion ~yBtem aard ~
ThiB printed ~iring card has a ~ace plate, 8hOWn in Pigure 3 . Vario~ connectionE~, Z;witche~3 ~n~ indi~ator lampq are inc:orporated on the ~aoe pla~e .
~nput ~nd output ~rom the lo~:al CR~ is tran~mi~ted U~RT 230. Input ~nd outpu ~rom the re~otQ CRT i~ via modem 3 0 and ~ o arld the remote lea~ o~ U~ ~ 3 ~ . UA~
230 i~ a univer~al a~:ynchronous r~acel~rer/tran-~mitter.
The~Q ~ nput commat~ds are transmitte~ ~ria the data ~u~
(D0-D7) ~ microcon~oller 200. U~R~ 230 ~nay }~
ple~nented with an Int~l ~evice part s~o~ 8~74, multl-protoaol ~erial ~ontrol devi::e. ~icrocontrc~ r 200 i~
connec:ted via a ~direc:tional link ~18 to relays 220.
~elays 220 ~el~c~ a ~:onnec~ion ~o on~ of the 26 ~
M~crocontroll~r ~00 is çonne~te~ to latahes 205.
Latches 205 operate ~o latGh an outpu~.memory addre~.
~he bidir~ctlonal data bu~3 r)o-D7 connect~; both ~ ~lo and EPRON 212 to m~croc:on~rolle~ 200. Mi~roc~ntr~ller 200 is connected 'co ~A~ 210 via the addre~ lou~
,, j, .3~ 2~S7~
leadE; Ao ~hrough All. M~croaontr~lle~ 00 i~ al~o con-necteâ ~o ÆiPRO~ 2î2 vi~ 2,ddr~as~ ~us lez~d~ AO through A13.
RAM 210 i~; a ranclo~ aca~ss memory devi~e pro~idiny a 2K
by ~-bit me~ory. EPiP~OM 212 is a~ ~le~tr~nic:ally p~o-gram~able xead only memory o~ size 8X b~ 8-bits.
Timer 245 is ~onne~ted to UA~ 230, ~i~r~cont~oll~r 2~0 ~n~l to cloak 240~ Timer 245 ~ay bs implemented with an In~el programmable inter~ral ~imer par~ no. 8~54.
The clock 240 drive~ all ~ihe ~iming ~unation~i of ~S~ he ~loak i~ss connea~ed. ~o miaro~ontrs:~ller 200, to timer 245, to UA~T 230 and to w;3.~ch dog ~m~r 242. ~he cloalc provide~ a ~reguen~:y o~ ~pproxima~ly ~1, 05 m~hert:z.
DC to D~ conv~rker ~70 prollide~ all pow~r to ~his 1~ circuit a~ w~ll a~ ~or illu~inati~g the lamp in~l¢ators on the ~a~e plate via a conne~ion ~o thq LED~ Z50. Th~
DC to DC ~onverter 270 will t~ke e1ther -48 volt~ or -24 volts as an input and provide ~12 Yolt~ volt: and ~5 volts as outputs.
The LE~S 250 and the swi~c:h~ 0 a~e c:o~n~c~ed to the miorocon~oller 200. The microcon~ollqr 200 serves to liqht or extingui~h each o~ th~ ht emitting ~iode~
~lamps) ~50. ~wit~he~ 2~ 3er~ to inpu~ variq~ func-tions ~o microcontroller ~00. The~e ~unction inclu~ed self te~t and goneral ~eset unction~7 ~e looal CRT i ~onneated to UART ~ 3 0 via the lo~al CRT lea~ e re~o~e C~T vi~ mode 30 i~ conne~te~ to mod~m ~0 w~th modem 40 oon~c e~ to U~R~ ~30 vi~ th~ re-mote CRT lea~. Each o~ the M~Us i~ conne~ted to relays 2~0 via a ¢o~re ponding lead MPU1 ~hrou~h MPU26.
COm~RndS are input ~ro~ the lo¢a} or re~ot~ CRTs t~
U~R~ 230. Th~e c~mmands are trans~erred f~o~ UART 230 vi~ the data ~u~ DO-D7 to microco~rolle~ ~00. The~, micro~ontroll~r 200 a~alyzes the commandO ~i~ro~on-troller 200 det~rmin~s whi~h MPU 1~ r~este~ by ~he ~ummand an~ c~nnects t~ that ~PU ~ia r~lays ~20. When th~ partioular ~P~ re~pond~, the re~pon~e i~ ~ran~ ed ~hrough rel~y-~ 2~0 vi~ the bidirection~l lîn~ 218 ~o mi~roco~troll~r 200~
35i7~
EPROM 212 contains the operating firmware for microcontroller 200. RAM memory 210 is a scratch pad data area for receiving and holding data transmitted by an MPU to the CSU.
When RAM memory 210 has been filled with MPU data, microcontroller 200 will transmit a message to the MPU, catlsing the MPU to cease transmitting any more data, until RAM memory 210 has available storage.
Microcontroller 200 displays the data transmitted received from an MPU upon the CRT which had made the request.
Then, the MPU will control sending all requested data, until this data has been sent to the CSU and displayed upon the appropriate CRT.
Timer 245 is a microcomputer peripheral device which supports asynchronous, byte synchronous and bit æynchronous protocols. Asynchronous communication protocols are used by the CSU during its interface with the CRTs. Timer 245 supports two receiver/transmitter channels. One channel supports the local CRT
and the other channel supports the remote CRT.
Clock 240 drives the other various timing functions of the CSU. These functions include the microcontroller, timer 245, UART 230, and watch dog timer 242. The watch dog timer circuitry 242 is located on the CSU printed wiring card and provides a circuit which must be reset by the microcontroller 200 software every 42 milliseconds. Failure of the microcontroller 200 software to reset the watch dog timer circuitry will result in a watch dog time-out. As a result of the watch dog time-out, watch dog circuit 242 will issue a reset signal to microcontroller 200 and to associated latching circuitry. This condition will also cause the local alarm lamp LED (Light Emitting Diode) to be turned-on. This local alarm lamp~ along with other lamps, switches and a connector9 are located on the face plate of the CSU
printed wiring card, shown in Figure 3.
LEDs 250 includes the local alarm LED mentioned above.
In addition, LEDs 250 include an active lamp, a modem lamp and a power on lamp. The active lamp indicates that the CSU is in ~L~9~7S~) active operation. The signal lighting thls lamp i8 generated by software command during normal CSU operation. The modem lamp indicates that the modem yort of the CSU is in use. Thls signal is generated by software of the CSU, when it is interfacing with the remote CRT via the modems. The power on light indicates that each of the three voltages (-~12 volts, -12 volts and +5 volts) is being provided to the CSU. The power on light is turned-off when the +5 volt or ~12 volt power supply is reduced to a ~ero voltage level or when the -12 volt power supply drops below a -6 volt level.
Switches 260 are momentary pushbutton switches for reset and self test functions. The reset pushbutton causes microcontroller 200 and associated latching circuitry to be reset.
The self test pushbutton enables the microcontroller 200 to perform predefined self test routines in response to an interrupt signal generated by pushing of the self test pushbutton.
The DC to DC converter 270 produces -~12 volts, -12 volts and ~-5 volts from either a -48 volt source or a -24 volt source.
Figure 3 depicts the CSU face plate. Four lamps or LEDs are shown for each of the above mentioned functions. In addition, two momentary pushbutton switches and a 25 pin RS-232-C
connector for connecting the local CRT to the CSU are shown.
Although the preferred embodiment of the invention has been illustrated, and that form described in detail, it will be readily apparent to those skilled in the art that various modifications may be made therein without departing from the spirit of the invention or from the scope of the appended claims.
Claims (18)
1. A terminal switching unit for a plurality of maintenance systems comprising:
intelligent terminal means including at least one local intelligent terminal means and at least one remote intelligent terminal means, said local and said remote intelligent terminal means each operated to transmit commands and to receive and display data;
said remote intelligent terminal means including, first modem means connected to said remote intelligent terminal means and to a transmission line, said first modem means arranged to transmit said commands from said remote intelligent terminal means to said transmission line and to receive said data from said transmission line and to transmit said data to said remote intelligent terminal means;
a plurality of switching and transmission systems and a plurality of maintenance processor unit means, each switching and transmission system including one corresponding maintenance processor unit means, each maintenance processor unit means arranged to perform diagnostic testing of said corresponding switching and transmission system responsive to said command, and to transmit said data gathered during the diagnostic testing of said corresponding switching and transmission system;
switching means including second modem means con-nected to said switching means and to said transmission line, said second modem means arranged to transmit said data from said switching means to said transmission line and to receive said commands from said transmission line, said switching means further connected to said local intelligent terminal means and each of said plurality of maintenance processor unit means, said switching means operable to analyze said commands transmitted by said local intelligent terminal means and to connect one of said plurality of maintenance processor unit means to said local intelligent terminal means for facilitating the transfer of said data from the connected maintenance processor unit means to said local intelligent terminal means, and alternatively said switching means further operable to analyze said commands transmitted by said remote intelligent terminal means and to connect one other of said plurality of maintenance processor unit means to said remote intelligent terminal means for facilitating the transfer of said data from the connected maintenance processor unit means to said remote intelligent terminal means;
said switching means being further operated in re-sponse to said commands to transmit said commands from said local intelligent terminal means to the connected maintenance processor unit means and alternatively, to transmit said commands from said remote intelligent terminal means to the connected maintenance processor unit means; and and in response to said commands from said local intelligent terminal means the connected maintenance processor unit performs said diagnostic testing of said corresponding switching and transmission system, transmitting said data to said switching means and alternatively,, in response to said commands from said intelligent terminal means the connected maintenance processor unit means performs said diagnostic testing of said corresponding switching and transmission system transmitting said data to said switching means.
intelligent terminal means including at least one local intelligent terminal means and at least one remote intelligent terminal means, said local and said remote intelligent terminal means each operated to transmit commands and to receive and display data;
said remote intelligent terminal means including, first modem means connected to said remote intelligent terminal means and to a transmission line, said first modem means arranged to transmit said commands from said remote intelligent terminal means to said transmission line and to receive said data from said transmission line and to transmit said data to said remote intelligent terminal means;
a plurality of switching and transmission systems and a plurality of maintenance processor unit means, each switching and transmission system including one corresponding maintenance processor unit means, each maintenance processor unit means arranged to perform diagnostic testing of said corresponding switching and transmission system responsive to said command, and to transmit said data gathered during the diagnostic testing of said corresponding switching and transmission system;
switching means including second modem means con-nected to said switching means and to said transmission line, said second modem means arranged to transmit said data from said switching means to said transmission line and to receive said commands from said transmission line, said switching means further connected to said local intelligent terminal means and each of said plurality of maintenance processor unit means, said switching means operable to analyze said commands transmitted by said local intelligent terminal means and to connect one of said plurality of maintenance processor unit means to said local intelligent terminal means for facilitating the transfer of said data from the connected maintenance processor unit means to said local intelligent terminal means, and alternatively said switching means further operable to analyze said commands transmitted by said remote intelligent terminal means and to connect one other of said plurality of maintenance processor unit means to said remote intelligent terminal means for facilitating the transfer of said data from the connected maintenance processor unit means to said remote intelligent terminal means;
said switching means being further operated in re-sponse to said commands to transmit said commands from said local intelligent terminal means to the connected maintenance processor unit means and alternatively, to transmit said commands from said remote intelligent terminal means to the connected maintenance processor unit means; and and in response to said commands from said local intelligent terminal means the connected maintenance processor unit performs said diagnostic testing of said corresponding switching and transmission system, transmitting said data to said switching means and alternatively,, in response to said commands from said intelligent terminal means the connected maintenance processor unit means performs said diagnostic testing of said corresponding switching and transmission system transmitting said data to said switching means.
2. A terminal switching unit as claimed in claim 1, said switching means including receiver/transmitter means connected to said local intelligent terminal means and to said second modem means, said receiver/transmitter means being operated in response to commands from said local and said remote intelligent terminal means to transmit parallel data in response to received serial data and to transmit serial data in response to received parallel data.
3. A terminal switching unit as claimed in claim 2, said switching means further including controller means connected to said receiver/transmitter means, said controller means being operated in response to parallel data of said receiver/transmitter means to analyze said command for selecting one of said plurality of mainte-nance processor unit means, said controller means being further operated in response to said data of said one connected maintenance processor unit means to transmit said parallel data to said receiver/transmitter means.
4. A terminal switching unit as claimed in claim 3, said switching means further including:
bidirectional ink means connected to said controller means, said bidirectional link means being operated to transmit said commands and receive said data to and from said controller means; and relay means connected between said bidirectional link means and each of said plurality of maintenance processor unit means, said relay means being operated in response to said controller means to connect said one maintenance processor unit means to said controller means via said bidirectional link means.
bidirectional ink means connected to said controller means, said bidirectional link means being operated to transmit said commands and receive said data to and from said controller means; and relay means connected between said bidirectional link means and each of said plurality of maintenance processor unit means, said relay means being operated in response to said controller means to connect said one maintenance processor unit means to said controller means via said bidirectional link means.
5. A terminal switching unit as claimed in claim 4, said switching means further including latching means connected to said controller means via an address bus, said latching means being operated in response to an ad-dress transmitted on said address bus by said controller means to store said transmitted address.
6. A terminal switching unit as claimed in claim 5, said switching means further including first memory means connected to said latching means and to said controller means via a data bus, said first memory means being operated to store data transmitted from said controller means via said data bus.
7. A terminal switching unit as claimed in claim 6, said first memory means including random access memory means.
8. A terminal switching unit as claimed in claim 6, said switching means further including second memory means connected to said first memory means and to said controller means, said second memory means being operated to store and transmit program code instructions to said controller means for operating said controller means.
9. A terminal switching unit as claimed in claim 8, said second memory means including electronically programmable read only memory means.
10. A terminal switching unit as claimed in claim 8, said switching means further including clock means connected to said controller means and to said receiver/
transmitter means, said clock means being operated to produce a plurality of periodic signals.
transmitter means, said clock means being operated to produce a plurality of periodic signals.
11. A terminal switching unit as claimed in claim 10, said switching means further including timer means connected to said clock means and to said receiver/
transmitter means, said timer means being operated in response to one of said plurality of periodic signals of said clock means to transmit one of a plurality of proto-col signals to said receiver/transmitter means for op-erating said receiver/transmitter means at one of a plu-rality of BAUD rates.
transmitter means, said timer means being operated in response to one of said plurality of periodic signals of said clock means to transmit one of a plurality of proto-col signals to said receiver/transmitter means for op-erating said receiver/transmitter means at one of a plu-rality of BAUD rates.
12. A terminal switching unit as claimed in claim 11, said switching means further including watch dog means connected to said clock means and to said con-troller means, said watch dog means being operated in re-sponse to an absence of a periodic first signal of said controller means to produce a second signal for resetting said controller means.
13. A terminal switching unit as claimed in claim 12, wherein there is further included indicator means connected to said controller means;
said indicator means including:
first lamp means for indicating an alarm status of said remote maintenance system;
second lamp means for indicating and active operation of said remote maintenance system;
third lamp means for indicating an active operation of said remote intelligent terminal means;
and fourth lamp means for indicating a power status condition of said remote maintenance system.
said indicator means including:
first lamp means for indicating an alarm status of said remote maintenance system;
second lamp means for indicating and active operation of said remote maintenance system;
third lamp means for indicating an active operation of said remote intelligent terminal means;
and fourth lamp means for indicating a power status condition of said remote maintenance system.
14. A terminal switching unit as claimed in claim 13, wherein there is further included manual input means connected to said controller means, said manual input means including:
first pushbutton means being operated to generate a signal to reset said remote maintenance system; and second pushbutton means being operated to generate a signal for self testing said remote maintenance system.
first pushbutton means being operated to generate a signal to reset said remote maintenance system; and second pushbutton means being operated to generate a signal for self testing said remote maintenance system.
15. A terminal switching unit as claimed in claim 14, wherein there is further included connector means for connecting said local intelligent terminal means to said receiver/transmitter means.
16. A terminal switching unit as claimed in claim 15, wherein there is further included power converter means connected to said controller means and to said in-dicator means, said power converter means being operated in response to a power input signal of a first or a sec-ond DC voltage level to produce power output signals of third, fourth and fifth DC voltage levels.
17. A terminal switching unit for a plurality of maintenance systems comprising:
intelligent terminal means including at least one local intelligent terminal means said local intelligent terminal means operated to transmit commands and to receiver and display data;
a plurality of switching and transmission systems and a plurality of maintenance processor unit means, each switching and transmission system including one corresponding maintenance processor unit means, each maintenance processor unit means arranged to perform diagnostic testing of said corresponding switching and transmission system responsive to said commands, and to transmit said data gathered during the diagnostic testing of said corresponding switching and transmission system;
switching means connected to said local intelligent terminal means, and each of said plurality of maintenance processor unit means, said switching means including controller means arranged to analyze the commands transmitted by said local intelligent terminal means, bidirectional link means connected to said controller means for transmitting said commands and receiving said data to and from said controller means, and relay means connected between said bidirectional link means and each of said plurality of maintenance processor unit means, and responsive to said commands from said local intelligent terminal means said relay means are operated by said controller means to connect a maintenance processor unit means to said local remote intelligent terminal means for facilitating the transfer of said data from said connected maintenance processor unit means to said local intelligent terminal means;
said switching means being further operated in re-sponse to said commands to transmit said commands from said local intelligent terminal means to the connected maintenance processor unit means; and said maintenance processor unit means operated in response to said commands from said local intelligent terminal means to perform said diagnostic testing of said corresponding switching and transmission system and to transit said data to said switching means.
intelligent terminal means including at least one local intelligent terminal means said local intelligent terminal means operated to transmit commands and to receiver and display data;
a plurality of switching and transmission systems and a plurality of maintenance processor unit means, each switching and transmission system including one corresponding maintenance processor unit means, each maintenance processor unit means arranged to perform diagnostic testing of said corresponding switching and transmission system responsive to said commands, and to transmit said data gathered during the diagnostic testing of said corresponding switching and transmission system;
switching means connected to said local intelligent terminal means, and each of said plurality of maintenance processor unit means, said switching means including controller means arranged to analyze the commands transmitted by said local intelligent terminal means, bidirectional link means connected to said controller means for transmitting said commands and receiving said data to and from said controller means, and relay means connected between said bidirectional link means and each of said plurality of maintenance processor unit means, and responsive to said commands from said local intelligent terminal means said relay means are operated by said controller means to connect a maintenance processor unit means to said local remote intelligent terminal means for facilitating the transfer of said data from said connected maintenance processor unit means to said local intelligent terminal means;
said switching means being further operated in re-sponse to said commands to transmit said commands from said local intelligent terminal means to the connected maintenance processor unit means; and said maintenance processor unit means operated in response to said commands from said local intelligent terminal means to perform said diagnostic testing of said corresponding switching and transmission system and to transit said data to said switching means.
18. A terminal switching unit for a plurality of remote maintenance systems comprising:
intelligent terminal means including at least one remote intelligent terminal means operated to transmit commands and to receive and display data, said remote intelligent terminal means including, first modem meas connected to said remote intelligent terminal means and to a transmission line, said first modem means arranged to transmit said commands from said remote intelligent terminal means to said transmission line and to receive said data from said transmission line and to transmit said data to said remote intelligent terminal means;
a plurality of switching and transmission systems and a plurality of maintenance processor unit means, each switching and transmission system including one corresponding maintenance processor unit means, each maintenance processor unit means arranged to perform diagnostic testing of said corresponding switching and transmission system responsive to said commands, and to transmit said data gathered during the diagnostic testing of said corresponding switching and transmission system;
switching means including second modem means con-nected to said switching means and to said transmission line, said second modem means arranged to transmit said data from said switching means to said transmission line and to receive said commands from said transmission line, and said switching means further connected to each of said plurality of maintenance processor unit means, said switching means including controller means arranged to analyze the commands transmitted by said remote intel-ligent terminal means bidirectional link means connected to said controller means for transmitting said commands and receiving said data to and from said controller means, and relay means connected between said bidirectional link means and each of said plurality of maintenance processor unit means and responsive to said commands from said remote intelligent terminal means said relay means are operated by said controller means to connect a maintenance processor unit means to said remote intelligent terminal means for facilitating the transfer of said data from said connected maintenance processor unit means to said remote intelligent terminal means;
said switching means being further operated in re-sponse to said commands to transmit said commands from said remote intelligent terminal means to the connected maintenance processor unit means; and said maintenance processor unit means operated in response to said commands from said remote intelligent terminal means to perform said diagnostic testing of said corresponding switching and transmission system and to transmit said data to said switching means.
intelligent terminal means including at least one remote intelligent terminal means operated to transmit commands and to receive and display data, said remote intelligent terminal means including, first modem meas connected to said remote intelligent terminal means and to a transmission line, said first modem means arranged to transmit said commands from said remote intelligent terminal means to said transmission line and to receive said data from said transmission line and to transmit said data to said remote intelligent terminal means;
a plurality of switching and transmission systems and a plurality of maintenance processor unit means, each switching and transmission system including one corresponding maintenance processor unit means, each maintenance processor unit means arranged to perform diagnostic testing of said corresponding switching and transmission system responsive to said commands, and to transmit said data gathered during the diagnostic testing of said corresponding switching and transmission system;
switching means including second modem means con-nected to said switching means and to said transmission line, said second modem means arranged to transmit said data from said switching means to said transmission line and to receive said commands from said transmission line, and said switching means further connected to each of said plurality of maintenance processor unit means, said switching means including controller means arranged to analyze the commands transmitted by said remote intel-ligent terminal means bidirectional link means connected to said controller means for transmitting said commands and receiving said data to and from said controller means, and relay means connected between said bidirectional link means and each of said plurality of maintenance processor unit means and responsive to said commands from said remote intelligent terminal means said relay means are operated by said controller means to connect a maintenance processor unit means to said remote intelligent terminal means for facilitating the transfer of said data from said connected maintenance processor unit means to said remote intelligent terminal means;
said switching means being further operated in re-sponse to said commands to transmit said commands from said remote intelligent terminal means to the connected maintenance processor unit means; and said maintenance processor unit means operated in response to said commands from said remote intelligent terminal means to perform said diagnostic testing of said corresponding switching and transmission system and to transmit said data to said switching means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US93589486A | 1986-11-28 | 1986-11-28 | |
| US935,894 | 1986-11-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1295750C true CA1295750C (en) | 1992-02-11 |
Family
ID=25467856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000551255A Expired - Fee Related CA1295750C (en) | 1986-11-28 | 1987-11-06 | Terminal switching unit for a plurality of maintenance systems |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE1000223A6 (en) |
| CA (1) | CA1295750C (en) |
| IT (1) | IT1223143B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5442690A (en) | 1992-08-25 | 1995-08-15 | Bell Communications Research, Inc. | Telecommunication service record structure and method of execution |
| US5455853A (en) | 1992-08-25 | 1995-10-03 | Bell Communications Research, Inc. | Method of creating a telecommunication service template |
| US5463682A (en) | 1992-08-25 | 1995-10-31 | Bell Communications Research, Inc. | Method of creating user-defined call processing procedures |
| US5481601A (en) | 1992-08-25 | 1996-01-02 | Bell Communications Research Inc. | System and method for creating, transfering, and monitoring services in a telecommunication system |
| US5511116A (en) | 1992-08-25 | 1996-04-23 | Bell Communications Research Inc. | Method of creating and accessing value tables in a telecommunication service creation and execution environment |
-
1987
- 1987-11-06 CA CA000551255A patent/CA1295750C/en not_active Expired - Fee Related
- 1987-11-17 IT IT22667/87A patent/IT1223143B/en active
- 1987-11-26 BE BE8701340A patent/BE1000223A6/en not_active IP Right Cessation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5442690A (en) | 1992-08-25 | 1995-08-15 | Bell Communications Research, Inc. | Telecommunication service record structure and method of execution |
| US5455853A (en) | 1992-08-25 | 1995-10-03 | Bell Communications Research, Inc. | Method of creating a telecommunication service template |
| US5463682A (en) | 1992-08-25 | 1995-10-31 | Bell Communications Research, Inc. | Method of creating user-defined call processing procedures |
| US5481601A (en) | 1992-08-25 | 1996-01-02 | Bell Communications Research Inc. | System and method for creating, transfering, and monitoring services in a telecommunication system |
| US5511116A (en) | 1992-08-25 | 1996-04-23 | Bell Communications Research Inc. | Method of creating and accessing value tables in a telecommunication service creation and execution environment |
| US5608789A (en) | 1992-08-25 | 1997-03-04 | Bell Communications Research, Inc. | Method of creating user-defined call processing procedures |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1223143B (en) | 1990-09-12 |
| BE1000223A6 (en) | 1988-08-30 |
| IT8722667A0 (en) | 1987-11-17 |
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Legal Events
| Date | Code | Title | Description |
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| MKLA | Lapsed |