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-
- This is an ORIGINAL file from P-80
- Systems...
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- << TSPS COIN CONTROL SIGNALS >>
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- from: <S><C><A><N><*><M><A><N>
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- Over the years several different methods of coin control have evolved to
- meet the changing needs. In addition to coin collect, coin return, and ringback
- the newer MW and expanded inband methods provide signals to control the
- polarity of the battery applied to the coin telephone by the local office. The
- ACTS and Calling Card Service features of TSPS make use of the additional
- signals. In some cases two back-to-back signals spaced by a guard interval
- (required to give the local office time to respond) are used. Guard intervals
- are also neccesary between coin control signals, machine generated
- announcements, and certain other suprivisory signals.
-
-
- There are FOUR different methods of coin control and ringback signaling
- used from TSPS-TO THE LOCAL CENTRAL OFFICE. They are POLAR MARGINAL,
- INBAND, MW, and EXPANDED INBAND SIGNALING (EIS) coin control. all but
- polar marginal coin control can be used from a remote trunking arrangement
- (RTA) to the local central office and can be used with E&M lead signaling on
- other physical or carrier facilities. All four types of coin control can be
- used with 2-wire physical facilities employing loop, high-low, reverse
- battery signaling. In addition all fout types of coin control can be used with
- all TSPS features (except RTA). However with Calling Card service, only MW and
- EIS coin control provide DTMF pad and totalizer control without station set
- modifications. For those of you that are unaware of the totalizers fuction
- it is simply to keep track of the total coin input and has both a LOCAL and
- TOLL mode.
-
-
- There are two types of coin telephones manufactured by Western Electric used
- for prepaid coin service. the older is COIN FIRST, the newer is DIAL TONE
- FIRST.
-
-
-
-
- COIN FIRST
- ---- -----
-
-
- These coin phones use a negative battery supply (usually -48 voltson the
- ring and ground on the tip but can be other voltages,eg, when range extenders
- are not used) from the local central office. They do not require a positive
- battery supply (+48 volts on the ring and ground on the tip). If equipped
- with DTMF, the DTMF pad is diabled unless an initial deposit equal to the
- local rate has been made. When the deposite is collected or returned, the
- DTMF pad is again placed in the disabled state. A feature called coin
- return has been provided for DTMF pad enablement with coin first telephones
- and is required for Calling Card service.
-
-
-
-
- Dial Tone First
- ---- ---- -----
-
-
- These coin telephones initially have the DTMF pad enabled and a negative
- battery supplied similar to the coin first telephones. However, the negative
- battery places the coin totalizer in the C-series sets in local mode,ie, the
- readout does not occur until an amount equal to the initial rate s deposited.
- This can result in composite coin signals which may not be recognized by
- operators or ACTS. In D-series sets the negative battery gives the DTMF pad
- priority over coin signals! Thus pad operation during coin deposite may
- result in coin signal errors at the TSPS.
-
-
- A positive battery supply (+48 volts on the ring and ground on the tip) is
- neede from the local central office when acoin deposite is requested by
- TSPS. The positive battery supply changes the coin totalizer in the
- C-series sets to the TOLL MODE, so that coin deposites of any denomination
- cause an immediate readout which can be detected by an operator or ACTS
- equipment. In the D-series sets, it gives priority to the coin deposites
- thus preventing DTMF pad interference. The positive battery supply also dia
- bles the DTMF pad on ALL BUT TYPE D of dial tone first type fones. Disabling
- the DTMF pad during coin deposites prior to ACTS was desirable to PREVENT
- SIMULATION OF COIN TONES WITH THE PAD!!!!! However, with ACTS the coin
- tone recievers used at TSPS will not respond to DTMF signals so the DTMF pad
- disabling function is no longer neccesary.
-
-
- NOTE: If a positive battery were applied to an A-series coin first
- telephone, the DTMF pad and coin totalizer would fail to function.
-
-
-
-
- Now we shall discuss in some detail the four types of coin control.
-
-
- POLAR MARGINAL COIN CONTROL
- ----- -------- ---- -------
-
-
- (signals)
-
-
- <1> The polar marginal coin control uses the following signals for coin
- control and ringback.
-
-
- (a) COIN COLLECT: +130 volts tip and -48 volts ring
-
-
- (b) COIN RETURN: -48 volts tip and +130 volts ring
-
-
- (c) RINGBACK: ground on tip and -48 volts ring and ground on ring for 50 to
- 100 milliseconds alternatly for the duration of the ringback signal
- (approx: 2-2.5 seconds). RINGBACK PROTOCOL: When ringback is used at the
- end of a call, the signal is repeated up to five times or untill off-hook
- suprivision from the local office is detected. The siganals are spaced at
- approxamately 4-second intervals. If the local office remains on-hook after
- five ringback signals have been sent,TSPS sends a coin return signal
- and then releases the connection (goes on-hook toward the local office). The
- release back will occur no sooner than 300 milliseconds after the coin control
- signal.
-
-
-
-
- <2> INBAND COIN CONTROL
-
-
- (signals)
-
-
- Inband coin control uses MF signals to control coins and ringback the coin
- station as follows:
-
-
- (a) COIN COLLECT: 700+1100 HZ
-
-
- (b) COIN RETURN: 1100+1700 HZ
-
-
- (c) RINGBACK: 700+1700 HZ
-
-
- An on-hook wink (off-hook,on-hook,off-hook) of 70 to 130 milliseconds is sent
- (50 to 100 in duration when recieved) from the TSPS equipment to alert the
- local central office to prepare a reciever for the MF signal that begins 95 to
- 195 milliseconds after the end of the wink. The MF signal will persist for
- approxamately 1 second for COLLECT & RETURN and 2 second for RINGBACK. The
- reciever requirements are are the same as for regular MF pulsing. RINGBACK
- PROTOCOL: The ringback protocol is the same as described in the POLAR MARGINAL
- coin control. It is used in step-by-step,NO.5 crossbar,NO.3ESS,and
- NO.5ESS switching equipment.
-
-
-
-
- I would like to take this oportunity to remind you this is an original file
- from P-80 Systems, and credits should not be removed from this file when
- posting on other systems!!!
-
-
-
-
- <3> MW COIN CONTROL
-
-
- MW coin control uses multiple on-hook wink signals sent from TSPS to a local
- central office. It is used in step-by-step,NO.5 crossbar,NO.3ESS and
- NO.5ESS switching systems, and by DMS-10 and DMS-100F digital switching
- systems. In addition to providing coin collect,coin return and ringback
- signals, this signaling format provides two additional signals, called
- OPERATOR-ATTACHED and OPERATOR-RELEASED. the operator-attached signal is used
- with dial tone first coin telephones to instruct the local office to change the
- mode of the coin totalizer or coin signaling priority to the TOLL mode by
- application of positive battery to the coin telephone (see first two
- paragraphs of this article). IT is not sent the first time a coin call is
- forwarded to TSPS ((contrary to:Notes On Distance Dialing 1975)for those of
- you that have it) because the local central office is expected to connect a
- coin call to the TSPS in the OPERATOR-ATTACHED condition. However, the
- operator-attached signal is sent before each subsequent TSPS attachment
- requiring a coin deposite. The OPERATOR-RELEASED signal (negative
- battery supplied to the payphone) restores the coin totalizer or coin
- signaling priority to the LOCAL mode and and enables the DTMF pad on certain
- payphones. The OPERATOR-RELEASED signal is sent whenever TSPS releases from a
- connection having a positive battery applied to the payphone. It is also
- sent upon initial connection to a 0+ coin call on a DIAL-TONE-FIRST trunk
- when the trunk provides for calling card service!!!
-
-
- (signals)
-
-
- The MW signaling format uses a series of 1 to 5 suprivisory on-hook winks
- from the TSPS to the local office outgoing trunks. The signals and there
- functions are as follows:
-
-
- Number of Use or
- on-hook winks Function
-
-
- 1
- OPERATOR-RELEASED
- 2
- OPERATOR-ATTACHED
- 3 COIN COLLECT
- 4 COIN RETURN
- 5 RINGBACK
-
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- The wink on-hook intervals as sent by the TSPS are 70 to 130 milliseconds and
- the wink off-hook intervals are 95 to 150 milliseconds. To allow for pulse
- distortion, the local central office trunk should be CAPABLE of operating
- with on-hook intervals from 50 to 150 milliseconds spaced from 75 to 185
- milliseconds apart when recieved !!!
-
-
- At the end of a wink signal, the TSPS will allow time for the locale central
- office to complete detection and application of the signal before
- sending a new signal. The minimum interval after sending a signal by TSPS
- and the maximum time in which the local central office (CO) must detect and
- apply the signal are as follows:
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-
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- . . . . . . . . . . . . . . . . . . . . . . . . . . .
- . SUBSEQUENT LOCAL OFFICE.
- . TSPS GUARD INTERVALS WORK TIME .
- .TSPS SIGNAL (minimum) (maximum) .
- . . . . . . . . . . . . . . . . . . . . . . . . . . .
- . .
- .oper.-attached 500-MS 380-MS .
- . .
- .oper.-released 500-MS 380-MS .
- . .
- .coin collect 1.1 seconds 880-MS .
- . .
- .coin return 1.1 seconds 880-MS .
- . .
- .ringback 2.4 seconds 2.1 seconds .
- . .
- .MS= Milliseconds .
- . . . . . . . . . . . . . . . . . . . . . . . . . . .
-
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- RINGBACK PROTOCOL: is the same as with
- MARGINAL POLAR ringback protocol.
-
-
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- <4> EIS COIN CONTROL
-
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- As with INBAND COIN CONTROL, EIS (expanded inband service) coin control
- uses an on-hook wink to alert the local central office that MF tones will be
- sent (to elaborate the wink serves the same function as KP when boxing, it
- simply tells the system that digits (MF tones) will be sent). IT is used in the
- NO. 1/1A ESS, NO.2/2B ESS, and NO.5 ESS switching systems, and the DMS-100F
- digital switching systems. With EIS, the wink is being extended to produce
- an on-hook of between 325 and 425 milliseconds (300 and 450 milliseconds
- when recieved). In addition the interval between the end of the wink
- signal and the start of the MF tones is being lenthend to a value of between
- 770 and 850 milliseconds while the duration of the tones is being
- reproduced to a value of between 480 and 700 milliseconds.
-
-
- (signals)
-
-
- TSPS is able to work with EIS after TSPS GENERIC 1T10 or GENERIC 1BT1 is
- installed. (GENERIC PROGRAM (software)=a set of instructions for an electronic
- switching system that is the same for all offices using that type of
- switching system. Detailed differences for each individual office will occur).
- The first instalation of this program occured in mid-1980. Each TSPS in use
- today should now have this change. The actual signaling is as follows:
-
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- . . . . . . . . . . . . . . . . . . . .. . . . . . . . .
- . SUBSEQUENT TSPS .
- . FUNCTION MF FREQUENCIES GUARD INTERVAL .
- . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
- . .
- .oper.-released 900 + 1500 (HZ) 600 milliseconds.
- . .
- .oper.-attached 1300+ 1500 (HZ) 600 milliseconds.
- . .
- .coin collect 700 + 1100 (HZ) 2 seconds .
- . .
- .coin return 1100+ 1700 (HZ) 2 seconds .
- . .
- .ringback 700 + 1700 (HZ) 2 seconds .
- . .
- .coin collect & 1500+ 1700 (HZ) 2 seconds .
- .oper.-released .
- . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-
-
- EIS also provides operator attached and operator released signals as does MW
- (multiwink) coin control. However in eis a coin station innitiating a 0+,0-
- or non-chargable call on a trunk providing CALLING CARD SERVICE is
- initially connected to the TSPS with negative battery applied to the
- station. AS with the other signaling methods, 1+ calls are initially
- connected with positive battery applied. THE operator attached signal
- is sent whenever the TSPS is connected for a coin deposit, and the operator
- released signal is sent whenever the TSPS is released from a connection
- having positive battery applied to the coin station. There is a new signal not
- available with MW, which is combined coin collect operator released. This
- signal which causes the local office to collect coins then apply negative
- battery to the coin station, is currently used for interim overtime
- collections still in the talking state. RINGBACK PROTOCOL: EIS uses a different
- ringback protocol than the other coin control signaling methods. The TSPS
- sends one ringback signal. The local office applies standard ringing (2
- seconds on, 4 seconds off) to the station and an audible ring toward the
- TSPS until the station answers or TSPS is released and recieved. The TSPS
- times for 30-36 seconds waiting for an answer. If answer is not recieved TSPS
- releases back. The local office performs a coin return before releasing
- the coin station. If answer is recieved and coin control signal sent, release
- back will not occur until at least 300 milliseconds after completion of the
- signal.
-
-
- IN CLOSING--
-
-
- I sincerly hope that this article has been of some assistance to all.
- Remember this is another original file from P-80 Systems &
-
-
- <S><C><A><N><*><M><A><N>
-
-
-