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AT&D2).

The convertor modems in a pool for outgoing calls should be configured as follows:

-

Switched line configuration;

-

non-silent mode (result codes enabled, Hayes command ATQ0);

-

CT107 indicates the state of the analogue connection (according to the V.24 specification,
Hayes command AT&S1);

-

when CT108 changes from ON to OFF the modem must go on hook (Hayes command
AT&D2).

C.4.1. Incoming

Call

Figure

Figure C-4 Call Phase Diagram for an Incoming Call.

shows the call phase diagram for

an incoming call. In order to understand the call phase diagram note the following:

-

a circuit number means that the circuit is in the ON state (active);

-

a circuit number followed by a `O' means that the circuit is in the OFF state (deactive);

-

the conversation mode during data transfer and clearing is not described (CT105 and
CT109 interactions).

DTE-B dials the convertor group DNR (ALC side of convertor pool) using for example Hayes
commands.

MODEM-A detects an incoming call (ring current) and activates CT125. In return the
SOPHO-LAM activates CT107 which is connected to CT108 of MODEM-A. Because
MODEM-A operates in the automatic answering mode, it answers the call after receiving an
active CT108. The SOPHO-LAM keeps CT107 active as long as the call exists.

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Summary of Contents for SOPHO Call@Net

Page 1: ...SPBX LICENSING AGREEMENT The licensing agreement for an ISPBX determines which facilities are available It is therefore possible that a facility described here will not work on a specific ISPBX even though it has been correctly configured Check the relevant license agreement to determine what is available GENERAL NOTE Fully Integrated Networks FINs are only supported by the iS3070 3090 ...

Page 2: ...igital information The digital peripherals can be connected to the ISPBX using the existing telephone wiring Alternatively digital connections can be used 1 1 DATA COMMUNICATION For the transfer of digital information between two digital parties terminals or peripherals the same facilities are available as for voice communication The ISPBX provides a transparent path between two ports and the term...

Page 3: ...k WAN 1 1 2 Data Communication over an Analogue Route A modem connection can be established over an analogue trunk or tie line to a data party located in another PBX or in the PSTN The analogue trunk or tie line is connected to an Analogue Trunk Unit ATU If the data party is connected via a modem to an ALC then a data call to an ATU can be established as if it was a normal voice call An outgoing c...

Page 4: ...een the DLC and the DTU is made directly An incoming call can be directly connected to the DLC after analysing the incoming number In this way a fully digital connection between the calling data party and the destination data party in different networks is possible If the external data party in the opposite network is connected via an analogue line to the external network a modem must still be use...

Page 5: ...hen the value of a boundary timer or option must be changed this can be effected via a new projecting with an adapted PEuu POM file Most of the options and timers can be changed in an operational system using the second line maintenance command EXSUBC sometimes activated by a hot start Boundaries can almost never be changed in an operational system because a change in a boundary results in a new p...

Page 6: ...s if the connection is allowed This involves checking traffic class of the caller the IBSC of the caller and the BSPT of the destination and the compatibility value connection allowance The called party is rung The called party answers Answering can be either from the DTE keyboard from the SOPHO SET SOPHO LAM or LAM automatically under control of a software program or from a telephone set if a mod...

Page 7: ... a DNR Data is passed between DTEs in a transparent channel The fully digital connection offers additional opportunities The DTE is not connected directly to the digital line circuit but to a DCE This can be a SOPHO SET SOPHO LAM or LAM The type of DCE determines the interface type between DTE and ISPBX network the dialling and answering capabilities for the call set up and clearing and the actual...

Page 8: ...r and this modulated carrier is transferred through the analogue network in the speech band The receiving modem demodulates the incoming signal and the digital information is transferred to the destination data party The two modems must be compatible with each other use the same transmit and receive frequencies In the case of full duplex communication Frequency Division Multiplexing is used The ca...

Page 9: ...its the connection The facilities offered by data protection prevent a break in attempt by another extension or operator A break in to an established modem connection could disturb the data connection For more information on these mechanisms see Facility Implementation Manual Management 2 2 CONNECTING A DTE TO A DLC DTX A DTE can be connected to the ISPBX using a Digital Line Circuit DLC or Digita...

Page 10: ...M used in the connection must be correctly programmed Both sides of the connection must be compatible The CV of the data DNR must be created as data CRCVAL or CHCVAL and assigned to the DNR CHAGCV For a SOPHO SET the CV for the voice DNR must be assigned as voice The CV of a data DNR can be used to download the data port parameters of the SOPHO SET SOPHO LAM or LAM If this is required then the dat...

Page 11: ... Data Circuit Terminating Equipment DCE A normal flat cable can be used for the connection The full digital connection for data communication within a FIN is illustrated in figure Figure 2 2 Full Digital Connection between Data terminals within the ISPBX ...

Page 12: ...SO lines DNR 5402 CV 3 Data DNR 5403 CV 3 Data DNR 5404 CV 3 Data DNR 5405 CV 3 Data DNR 5407 CV 3 Data DNR 5406 CV 3 Data DNR 5408 CV 3 Data DNR 5301 CV 0 Speech DNR 5302 CV 0 Speech CV3 CV3 allowed CV3 CV0 not allowed V 24 V 24 LAM DCE SOPHO LAM DCE SOPHO LAM DCE SOPHOSET DCE SOPHOSET DCE V 24 V 24 V 24 V 24 V 24 V 24 2B D 2B D 64 kbps 64 kbps 64 kbps 64 kbps 64 kbps 64 kbps DTE DTE DTE DTE DTE ...

Page 13: ...tination data port is established If the two ports are located in the same unit only one switching network is involved If the ports are located in different units the 64 kbps connection is established between two or more switching networks connected together by a 64 kbps timeslot in 2 Mbps inter unit links For full duplex communication a reversed path from the called to the calling data port is al...

Page 14: ...e CPU using D channel messages If an idle data party is called the microprocessor receives a call set up message If required the calling party identification part of the call set up message can be sent to the DTE The incoming call can be answered automatically DCE answers the call autonomously or manually DTE answers the call The data rate adaptor starts sending and receiving the frame pattern Aft...

Page 15: ...s Keyboard dialling Data port programming LAMPS MEMORY DATA RATE ADAPTION DATA RATE ADAPTION 64 kbps B channel V 24 X 21 V 24 X 21 16 kbps D channel 64 kbps B channel MULTIPLEXER INTERFACE CONTROL µP 2B D 152 kbps Keyboard dialling AT command dialling V 25bis dialling Data port programming LAMPS DISPLAY KEYPAD MEMORY DATA RATE ADAPTION 64 kbps B channel V 24 16 kbps D channel MULTIPLEXER ...

Page 16: ...nsferred The two DCEs use a frame structure to communicate with each other The user data and interface control signals are located in fixed positions within that frame The data rate adaption methods supported by SOPHO SET SOPHO LAM and LAM are summarised below INTERFACE CONTROL µP ECHO CANCELLER 2B D 152 kbps SOPHO SET 308 and S375 D only DATA RATE ADAPTION ANALOGUE DIGITAL CONVERTOR AUDIO INTERFA...

Page 17: ...in a timeslot in the 2 Mbps highway to the PSC PMC The 64 kbps signal is transferred to the opposite DLC via the PSC PMC and the switching network and if necessary inter unit links The receiving DLC extracts the 64 kbps user channel from the 2 Mbps highway and multiplexes it into the user channel of the 2B D line to the destination DCE The data and control signals are extracted from the 2B D line ...

Page 18: ...P375 Data rate adaptions supported Philips proprietary Philips proprietary X 30 X30 V 110 V 110 Synchronous speeds supported 600 600 1200 1200 bps 2400 2400 4800 4800 9600 9600 19200 19200 38400 38400 48000 48000 48000 56000 56000 56000 64000 64000 64000 Asynchronous speeds supported 50 75 bps 110 150 200 300 300 300 600 600 600 1200 1200 1200 1200 75 1200 75 ...

Page 19: ...l from the 2B D line and inserts it in a timeslot in the 2 Mbps highway to the PSC The 64 kbps signal is transferred to the opposite DLC via the PSC PMC and the switching network and if necessary inter unit links The receiving DLC extracts the 64 kbps user channel from the 2 Mbps highway and multiplexes it into the user channel of the 2B D line to the destination DCE The data is extracted from the...

Page 20: ...as used by another remote DTE A data profile contains a complete data port set up Four profiles can be defined A profile must also be allocated to an entry in the name directory of the DCE When either an incoming call from or an outgoing call to another DTE is made the DCE automatically changes the data port set up to that of the profile the two data ports are compatible When a call is initiated u...

Page 21: ...inals to the SOPHO network is illustrated below Figure 2 6 X 21 Connections Two dialling options are offered for the LAM 309 The option is selected by an OM command parameter when creating the CV Switched line The destination is dialled and a connection is made according to one of the following methods The LAM user dials the destination using a keyboard dialling command The LAM analyses the comman...

Page 22: ...ter case the LAM monitors the transmit and receive lines of the X 21 interface If there is no activity on the lines during a specified time period the LAM clears the call automatically The data guarding option and the time limits can be specified in the CV related to the DNR This can then be downloaded to the data port The parameter setting for the X 21 interface is described in appendix A 2 5 GAT...

Page 23: ... data party does not have to dial a free LAM gateway but only the group DNR Group hunting ensures that a free LAM gateway circuit is accessed 2 6 BASIC SERVICE PROFILES BSP A Basic Service Profile is the combination of a DNR and a Basic Service Profile Type BSPT and is identified by a Basic Service Profile Identifier BSP ID This BSP ID is assigned to a line circuit by OM CHDNRC One extension circu...

Page 24: ...callers must be able to discriminate between parties at an S inf0 bus with the same service identifier the facility Multiple Subscriber Number MSN must be used Example 2 BSP ID discriminates between a voice and a FAX call An analogue telephone set has two BSP IDs DNR 2400 with BSPT 95 voice possibly voice DNR 2400 with BSPT 06 telefax4 The FAX machine has the following BSP ID DNR 2401 with BSPT 06...

Page 25: ...sed in this chapter Both a DTE connected via a modem to an ALC or a DTE connected via the data port of a SOPHO SET SOPHO LAM or LAM to a DLC DTX can gain access to the trunk line For both types of parties the data communication aspects over an analogue route and over a digital route are discussed A number of trunks or tie lines can be grouped into bundles a number of bundles can be grouped into ro...

Page 26: ...utomatic dialling modem If the modem supports V 25 bis or Hayes commands the user can type the trunk access code and the external number directly from the DTE for an outgoing call The modem transfers this information as impulses or keytones to the ALC Manual dialling modem The user must dial the destination DNR from a telephone set connected to the modem The telephone set transfers the dial inform...

Page 27: ...the external number Note The last two conditions can be avoided for outgoing calls if the route option direct switch through is true No number analysis is performed on the external number any more After the trunk access code the speech path between the calling party and the trunk is established The dialled digits for the external number are not regenerated by the ISPBX any more The user can only d...

Page 28: ...s speeds up to 64 kbit s support of automatic convertor interconnection only the destination DNR has to be dialled Disadvantages V 110 and X 30 Data Rate Adaption are not supported Proprietary only Hayes modems are not supported because the modem has to operate in the CT108 1 mode SOPHO LAM convertor configuration Advantages V 24 V 24 V 24 V 24 DCE DCE DLC DTX DLC DTX ATU MODEM MODEM ISPBX ISPBX M...

Page 29: ...rom the MLU to the ATU through the switching network has to be set up The configuration of such a leased line connection is shown in figure Figure 3 3 Digital Connection to an Analogue Trunk with MLU Convertor Leased Line Figure 3 3 Digital Connection to an Analogue Trunk with MLU Convertor Leased Line Call progress is as follows For an outgoing data call When a DTE dials the trunk access code to ...

Page 30: ... direction of the call set up The circuits on the MLU are assigned a line number This line is related to a bundle and the bundle to a route This route is related to a destination which can be reached using a normal trunk access code For more information on the line and routes see Facility Implementation Manual Networking and Routing The outgoing route option Direct Switch Through must be set to tr...

Page 31: ... the SOPHO LAM Normally the SOPHO LAM operates in the DCE mode The SOPHO LAM is set in the DTE mode using a special signalling group for projecting the DLC or DTX I see Appendix C Note that a special cable must be connected between the SOPHO LAM and the modem see appendix C Note that the leased line configuration can be used for both incoming and outgoing calls call setup direction The convertor s...

Page 32: ...nation DNR In this situation the calling party uses the keyboard dialling protocol of the SOPHO LAM to dial the destination So when the convertor modem detects an incoming call for example an incoming carrier it initiates a call request to the SOPHO LAM After the call request and after the connection between the modems is established the SOPHO LAM waits for dial information The calling party sends...

Page 33: ...tenance terminal must have acces to the V 24 interface of the SOPHO LAM from the modem towards the SOPHO LAM This is not the case in the leased line configuration Therefore in the leased line configuration the maintenance terminal can not be used to change the SOPHO LAM settings Another method has to be used For example by using the key pad of the SOPHO LAM or by downloading the SOPHO LAM To chang...

Page 34: ...When the remote terminal is switched on the remote modem sets up a connection to the convertor modem After the connection between the modems is established the remote terminal is connected to the SOPHO LAM The remote terminal can initiate a call request by typing a character CT103 as call request After the call request the SOPHO LAM sets up the connection to a fixed destination using PDD or hotlin...

Page 35: ... the SOPHO LAMs using OM command DOWNLD If required project a Permanent Line Extension using OM command CHPLEX If required project a hotline relation using OM command CHHOTL If required program the predefined destination DNR in the convertor SOPHO LAM Ensure that the convertor modem is configured for leased line operation Ensure that the convertor modem operates in the silent mode result codes dis...

Page 36: ...e modem has to be connected to a Modem Line Unit MLU see figure Figure 3 6 Digital Connection to an Analogue Trunk with MLU Convertor Switched Line An MLU is a board in a Unit Group of a PM It can control a maximum of 4 modems Each modem can be connected between any analogue tie or trunk line and any digital line circuit via the MLU Modems of the same type are placed in a modem pool When a modem i...

Page 37: ...ich type of modem must be used is determined in the CV A CV B convertor type number array This array is defined with the command ASCVCT With this command the modem type that must be used when a connection between an internal DTE and an analogue trunk line is defined In a FIN the number of modem pools different modem types is limited by the network boundary NEBOUND 033 max size of convertor compati...

Page 38: ... convertor configuration for both incoming and outgoing calls The SOPHO LAM convertor is used either for incoming calls or for outgoing calls So at least two convertor pools should be created one for incoming and one for outgoing calls The reason for this is that Hayes modems send strings to the SOPHO LAM In some situations this can give problems For example during an incoming call the modem sends...

Page 39: ... refer to the user manual of the modem Unlike automatic convertor interconnection by CV the IBSC of the internal calling party can not be used for addressing the destination The SOPHO LAM convertor uses the IBSC of the output of the convertor ALC side for addressing the basic service profile of the destination Individual convertor selection is used to access one single convertor This way of select...

Page 40: ... LAM Then the calling party has to specify the destination DNR Depending on the modem Hayes commands and or V 25bis commands can be used For example the DTE dials ATD destination DNR The convertor modem now sets up the connection via the ALC Incoming call The calling party dials the convertor group DNR pool for incoming calls This is the group DNR of the ALC circuits to which the convertors are co...

Page 41: ...tie line is informed about this via the convertor The modem must be able to handle the destination information from the calling party For example Hayes or V 25 bis During the convertor interconnection the ISPBX checks the IBSC BSPT compatibility and the CV compatibility When a convertor is selected then the call is proceeded with the service characteristics of the convertor output circuit For exam...

Page 42: ...Hayes command AT D2 CT107 indicates the condition of the analogue line normal operation according to V 24 specifications This means the following CT107 is OFF in the idle state CT107 goes OFF when the Hang Up process is started CT107 goes ON as soon as the connection set up is started CT107 goes ON in the V 25 bis dialog mode You can set this operation using Hayes command AT S1 For a convertor poo...

Page 43: ...n the digital trunk or tie line For full duplex communication the reversed path must also be established Figure 3 9 Analogue Connection to a Digital Trunk For an outgoing call the internal DTE must be allowed to dial the applicable trunk access code For an incoming call the external party must be allowed to dial the ALC DNR The connection allowance between the compatibility value of the internal D...

Page 44: ...e external network by a digital interface or by a modem This gives rise to the following configurations Opposite DTE connected to a digital interface No modem connection in the ISPBX has to be used The 64 kbps data signal from the DLC DTX can be transparently switched through to a circuit of the DTU DTX Here the 64 kbps signal with the user data incorporated is inserted in a free timeslot in the 2...

Page 45: ... internal DTE must be allowed to dial the relevant access code or the incoming call must be allowed to dial the DLC DTX DNR The connection allowance between the CV of the internal DTE and the CV of the route must be set to allowed with convertor 2 The relation between the CVs must indicate which type of modem is to be used For more information see the modem pool dialling part with the analogue tru...

Page 46: ...connection between the switching network and the external network The access code will be a trunk access code for connection to the public network or a network access code for connection within a private network For an incoming call For an incoming call DDI the number is analysed in the DDI tree related to the digital route If the number indicates an internal number ringing current is sent to the ...

Page 47: ...users in both networks are compatible a special parameter is transferred over the ISDN link with incoming or outgoing calls This parameter is the External Service Indicator ESI The ESI is a two byte code which is derived from the IBSC of the ISPBX internal party The ESI can be assigned as voice or data together with some additional values for data such as speed and parity For an incoming call the ...

Page 48: ...dix A For more information on the routing aspects and on the Service Indicator Code see Facility Implementation Manual Networks and Routing 3 3 4 1TR6 Route A 1 Technische Richtlinie 6 1TR6 link is used for connection to a private or a public network The link can be either A 2Mbps line 30B D timeslot 16 is used for signalling timeslot 0 is used for synchronisation This requires a DTU PH which hand...

Page 49: ...2 SI is a two byte code which is derived from the IBSC of the ISPBX internal party The VN2 SI can be assigned as voice or data together with some additional values for data such as speed and parity For an incoming call the VN2 SI is translated into an Internal Service Identifier ISI The ISI comprises an Internal Service Identification Code ISIC and an Internal Basic Service Category IBSC The ISIC ...

Page 50: ...ks are compatible For an incoming call the fixed IBSC 3 1 kHz audio non ISDN IBSC 3 is passed to the destination port and used for conectivity checking For more information on routing aspects see Facility Implementation Manual Networking and Routing ...

Page 51: ...ss marks to a DNR are mentioned in the applicable facility description With the OM command DIFACM all facility class marks that are assigned to a DNR can be displayed In a number of cases the extension user has to activate a facility by dialling a certain prefix from the extension data terminal In the facility description the OM command that must be used to assign the prefix in the correct analysi...

Page 52: ...onisation of the connection The tone will not be sent to a busy terminal when the call of the busy DNR is data protected A call can be data protected in 3 different ways as discussed in the data protected facility Not only the call waiting tone burst is not sent towards the data terminal it is even not possible to break in or listen in on the connection by either operator or other extension users ...

Page 53: ...n If this data protection is successful the user receives dial tone and a normal call setup is possible Only for this call the connection is data protected After the call has been released the data protection mark is erased and must be set again for a next data protected call If an IBSC is used that is not for speech then it is impossible for a speech oriented third party to break in to the connec...

Page 54: ...fered for voice calls are also available for data calls see Group Arrangements in the Facility Implementation Manual Voice Facilities This facility is particularly useful for a pool of host computer ports terminals or printers Each data port has its own DNR these ports must be collected in a group arrangement When a call is routed to the group DNR a cyclic or fixed hunting sequence is started to f...

Page 55: ...ta port or by programming the data port locally on the LAM or SOPHO SET Keyboard dialling is the default condition for a DTE which is connected to a LAM If the DTE is connected to a SOPHO SET S375D however the SOPHO SET must be programmed to allow keyboard dialling see the appropriate manuals and user guides 4 13 MNEMONIC NUMBER DIALLING The number of another data terminal can be dialled from the ...

Page 56: ...NG CONNECTIVITY For a successful data connection it is necessary that both parties involved are compatible A number of checks are done by ISPBX to ensure this compatibility This section describes a number of important factors in determining connectivity Internal Basic Service Category IBSC Each DNR has an IBSC allocated to it A default IBSC is allocated using NEBOUND 025 All DNRs get this IBSC unl...

Page 57: ...e CV of a DNR can be changed using the OM command CHAGCV The CV of a route can be changed using the OM command CHRTCG The maximum number of CVs in the network is determined by NEBOUND 032 The CV for a data port can be used to download the parameters of a DCE Such a CV can be created using the OM command CRCVAL or changed using CHCVAL Downloading is done using DOWNLD The connection allowance of CVs...

Page 58: ...9 1 Slow scan television 10 10 1 Fernwirken 11 11 1 GrafikTelefon 12 12 1 Bildschirmtext 13 13 1 Bildtelefon Bild 14 14 1 SOPHO speech 15 15 1 SOPHO modem data 16 16 1 X 21 17 17 1 X 25 18 18 1 Bildtelefon Ton 19 19 1 64 kBit s unrestricted non ISDN 20 93 User definable 2 Free for use CRBSPT command 94 0 2 3 4 5 6 7 8 9 10 11 12 13 15 16 17 19 2 Data possibly data 95 1 3 4 14 18 19 2 Voice possibl...

Page 59: ...n of compatibility within ISPBX For an outgoing call Information passed over the route must be accompanied by an External Service Indicator ESI The Lower Layer Compatibility LLC from the user port if applicable is incorporated into the ISIC The ISIC and IBSC are combined into the ISI which is translated to an ESI The list below shows the route type and the name used to identify the ESI 96 0 2 5 6 ...

Page 60: ... compatible Not allowed 1 The ports may not be connected even though they may be compatible Allowed with convertor 2 A modem must be used to connect the two ports Allowed 3 The ports can be connected together The OM command CHCVCA is used for defining the connection allowance between CVs The command defines the connection allowance between the calling party CV A and the called party CV B To allow ...

Page 61: ...knows that a modem has to be switched into the connection between the DLC and the ATU Convertor Type The convertor type is determined by a table corresponding to the CV connection allowances This table is defined by the system manager with the OM command ASCVCT This is a table indicating which convertor type must be used when CV A is to be connected with CV B If the connection is to be set up in b...

Page 62: ...or type every time the extension makes the same outgoing data call dialling the trunk access code and the external number If the extension user wishes to select another modem type for instance with another data speed then the user can select which convertor type is switched into the data path The user has to dial the Convertor Prefix and Convertor Type Number followed by the trunk access code for ...

Page 63: ...R A CV is assigned to the DNR as described above This CV must be for data and subsequently have the additional interface parameters The parameters are downloaded to the data port in the following circumstances Manual request with OM command DOWNLD If the DLC circuit is transferred to the service condition INS Whenever the SOPHO SET SOPHO LAM or LAM is connected to the telephone line Upon manual re...

Page 64: ...ending on the state of the data terminal connected to the port When the X 21 DTE is ready the LAM 309 will send a message towards the ISPBXto set up the hot line connection When the X 21 DTE is not ready the LAM 309 will send a message towards the ISPBX to clear the hot line connection If set to 1 the hot line call set up and clear request is done using the key on the front of the LAM 309 Speed Mo...

Page 65: ...ginating DNR and a destination DNR The destination number may be stored in the LAM 309 see chapter Internal Data Communication E BYTE ORIENTED PROTOCOL This parameter defines if the transfer of information between the data terminal and the data port is byte or bit oriented If this parameter is set to 0 the protocol is bit oriented In this case the value for parameter 6 wordlength is not important ...

Page 66: ...66 Note If the timer is assigned the value 000 the timer is not used any more The data guarding is NOT active SSS for GUARD 2 Not used for a LAM 309 Enter 000 ...

Page 67: ... 2 wire or 4 wire and this type must be set accordingly by means of straps on the MLU The straps are numbered X1 1 to X1 8 X1 1 and X1 2 for modem number 0 X1 3 and X1 4 for modem number 1 X1 5 and X1 6 for modem number 2 X1 7 and X1 8 for modem number 3 The board positions of the straps and the correct settings for 2 wire or 4 wire operation are given in the Maintenance Manual To be able to adapt...

Page 68: ...E and the MLU as the DTE The control of the board is performed by a microprocessor This control is common for all modem circuits This control guards the status of the 4 modem circuits on the board The status changes of the modems are transferred to the PPU and further on to the CPU via the CODI and CODO 2 Mbps lines on the back panel The user information is transferred via the USI and USO 2 Mbps l...

Page 69: ... 2 Straps 1 Strap CODO CODEC CODI D A V 24 DRIVER V 24 Analogue from modulator to demodulator MODEM MLU INPUT PORT TIMING µP CONTROL CLOCK ADAPT DATA RATE ADAPTOR OUTPUT PORT 103 105 113 107 142 104 106 115 109 108 1 111 126 140 141 102 TxD RTS TSET DSR T1 USO USI CLOCK CDSL DSRS STF RIL LL GND V 25 TONE GENERATOR 1300 Hz CALLING TONE 2100 Hz or 2225 Hz ANSWERING TONE V 25 TONE DETECTOR 2100 Hz or...

Page 70: ...be modulated and transmitted MODEM MLU DATA VOICE CONTROL RTS RFS TSET RSET DCD RI RIL TI LL TXD DSRS STF RxD DSR CDSL CT105 CT106 CT113 CT115 CT109 CT125 CT140 CT142 CT141 CT103 CT111 CT126 CT104 CT107 CT108 1 TRANS REC CONTROL TRANSMIT CLOCK Only used with synchronous communication SHIFT REGISTER SHIFT REGISTER MOD DEMOD RECEIVE CLOCK CARRIER DETECT RING INDICATOR TEST CONTROL ...

Page 71: ...mand which does not need a second condition CT109 DCD data carrier detect This signal indicates to the MLU that an incoming carrier signal is detected CT111 DSRS data signal rate selection If the modem offers the possibility to operate with a high or a low speed the MLU is able to select the high or the low speed by means of this signal The lower speed can be selected if there are too many transmi...

Page 72: ...o connect CT103 and CT104 can the test mode be entered CT142 TI test indicator The modem indicates to the MLU that the test mode is entered after a loop request Note The MLU does not support the RI ring indicator signal CT125 B 1 V 25 CALLING AND ANSWERING TONES If a modem is equipped with an Automatic Calling Unit the connected DTE can send a destination number to this ACU The modem now transfers...

Page 73: ... the answering tone Calling party When the calling modem detects the answering tone it stops sending the calling tone Called party The called modem detects the end of the calling tone and stops the answering tone Now also the signal CT107 is returned to the DTE to indicate the modem is ready for operation The DTE sends CT105 to the modem and the modem starts sending the carrier in the backward cha...

Page 74: ...ll not respond to the calling tone and immediately send the carrier in the high band The calling modem will detect this 2400 Hz carrier and consider it to be the indication that the called party is connected After sending the 1200 Hz carrier the connection is established If neither the called modem nor the calling V 24 V 25 bis V 24 V 25 bis MODEM NETWORK MODEM Calling DTE Called DTE CT108 on CDSL...

Page 75: ...r one direction only By means of the relation CV A CV B modem pool type the modem must be assigned to a pool with modems with one direction incoming or outgoing The relation CV trunk line CV internal party incoming now uses a different modem pool type than for the relation CV internal party CV trunk line outgoing B 2 1 Incoming Call Modem pool dialling with incoming calls is only possible for trun...

Page 76: ...ination party and starts waiting for the answering of the call The call establishment is guarded by timers When the destination party answers the call manually or automatically the pool modem is activated CT108 1 CDSL forces the modem on line CT111 DSRS is sent to the modem to indicate if the high or the low speed must be used depending on the projecting of the MLU circuit CT126 STF is set in the ...

Page 77: ...er the trunk line in the applicable signalling type bundle dependent The V 25 Automatic Calling Unit of the modem is not used Two data paths are established through the switching network From the destination party to the MLU The V 24 user data is incorporated in a 2B D 64 kbps signal by a SOPHO SET SOPHO LAM or LAM and transferred to the MLU circuit via the DLC circuit and the switching network Th...

Page 78: ...dy to accept data The modem now starts transmitting the 1200 Hz carrier in the forward channel and returns CT106 RFS to the DTE to indicate the DTE may starts sending The connection between the remote party and the local party is established Note Depending on the projecting of the MLU it can switch the CT111 circuit DSRS to off or on to indicate to the modem that the low or the high speed must be ...

Page 79: ...a For more information see Projecting aspects If the send and receive frequency of the modem is controlled by the MLU by signal CT126 STF the constant carrier can only be in the high frequency band If the modem is idle the signal CT126 is in the off condition The modem is set in the calling mode and only detects the carrier in the high frequency band If the send and receive frequency is controlled...

Page 80: ...a The connection between the remote party and the local party is established B 3 2 Incoming Call For an incoming call over a leased line the procedure is quite different from the convertor situation Because there is no way of detecting an incoming call when the line is connected to the telephone set unattended modem the CDSL CT108 1 signal must be continuously active The modem is continuously conn...

Page 81: ...ice retrieves the user information from the 64 kbps signal and sends it to the data terminal For full duplex data communication the reversed path must also be established through the switching network The outgoing route option direct switch through must be yes As the analogue part of the MLU is not used the tone generation and detection circuits of the MLU are not available the modem must be able ...

Page 82: ... asynchronous communication If the communication is asynchronous the speed of the communication is determined by the projecting of the MLU and the speed of the user terminal for the initiated call S8 on synchronous communication If the communication is synchronous the speed of the communication must be set with the DIL switches 1 to 5 see table B 2 SPEED S1 S2 S3 S4 S5 600 on off off off on 1200 o...

Page 83: ...U generates the V 25 answer and calling tones S10 off modem generates the answering tone itself switch 9 determines if the MLU or the modem generates the calling tone S9 off modem also generates the calling tone itself the MLU does not have to generate any tone S9 on modem does not generate the calling tone the MLU must generate calling tone S10 on modem does not generate any tone itself the MLU m...

Page 84: ...and two paths through the switching network must be established from the DLC circuit to the V 24 interface of the MLU circuit and from the analogue interface of the MLU circuit to the ATU circuit The MLU circuit must be assigned to a modem pool In this case the board must be assigned with board type 33 1 The modem is used for leased line connection and only one path through the switching network h...

Page 85: ...used when bit 2 is 0 0 The speed is fixed to low speed by means of a constant value of the signal DSRS CT111 1 The speed is fixed to high speed by means of a constant value of the signal DSRS CT111 Bit 4 constant carrier with guarding only used with leased lines constant carrier This bit indicates if the MLU must be blocked if no carrier is detected on the leased line The MLU expects a constant ca...

Page 86: ...o determine which speed high or low is to be used the ISPBX needs a reference This reference is byte 0 The Compatibility Value for the data party also holds data transfer speed If the CV speed indicates that the speed of the call is smaller than the speed indicated by byte 0 the DSRS signal is used to set the modem in the low speed mode If the CV speed indicates the speed of the call is higher or ...

Page 87: ... between these bits This relation is displayed in diagram Figure C 8 In this diagram also the standard signalling groups are indicated BYTE VALUE HEXADECIMAL DECIMAL SPEED bps 0B 11 50 0C 12 75 0D 13 110 0E 14 150 0F 15 200 10 16 300 11 17 600 12 18 1200 13 19 2400 14 20 3600 15 21 4800 16 22 7200 17 23 9600 18 24 12000 19 25 1200 75 1A 26 14400 1B 27 19200 1C 28 38400 1D 29 48000 1E 30 56000 1F 3...

Page 88: ... outgoing calls STF CT126 switched The communication speed is fixed to the high speed of the modem DSRS CT111 fixed on 1608 Modem is used as a pool modem in the convertor configuration for both incoming and outgoing calls STF CT126 switched The communication speed is call dependent DSRS CT111 switched The speed is switched to the high speed if the CV speed indicates the communication speed is 1200...

Page 89: ...hout guarding the line When transmitting the modem uses the low band STF CT126 off The communication speed is fixed to low speed DSRS CT111 off 160E Modem is used as a pool modem in the leased line configuration for outgoing calls only the MLU expects a constant carrier on the line and guards the line When transmitting the modem uses the low band STF CT126 off The communication speed is fixed to l...

Page 90: ...r on the line and guards the line When transmitting the modem uses the high band STF CT126 on The communication speed is fixed to low speed DSRS CT111 off 1618 Modem is used as a pool modem in the leased line configuration for outgoing calls only the MLU expects a constant carrier on the line but without guarding the line When transmitting the modem uses the high band STF CT126 on The communicatio...

Page 91: ...on speed is fixed to high speed DSRS CT111 on 1620 Modem is used as a pool modem in the leased line configuration for both incoming and outgoing calls the MLU does not expect a constant carrier on the line When transmitting the modem uses low band STF CT126 off The communication speed is fixed to low speed DSRS CT111 off 1622 Modem is used as a pool modem in the leased line configuration for both ...

Page 92: ...line configuration for both incoming and outgoing calls the MLU does not expect a constant carrier on the line When transmitting the modem uses high band STF CT126 on The communication speed is fixed to high speed DSRS CT111 on BIT 0 BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BYTE 0 1 0 0 1 0 0 0 H FF don t care don t care don t care BIT 0 BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BYTE 0 1 0 0 0 0 0 1 H FF don...

Page 93: ...ecial sub signalling groups These subsignalling groups are The basic functions of the SOPHO LAM operating in DTE mode can be divided in three parts basic functions during an incoming call during an outgoing call and during idle state Note active signal ON state of V 24 circuit deactive signal OFF state of V 24 circuit Incoming call When the modem detects an incoming call it activates CT125 This ci...

Page 94: ...s commands Idle state In idle state CT107 of the SOPHO LAM is OFF The extended functions of the SOPHO LAM operating in DTE mode are as follows The SOPHO LAM can select the calling or answering mode of the modem via CT142 Output circuit CT142 of the SOPHO LAM is connected to circuit CT126 of the modem CT142 is programmable When CT142 is active the modem transmits in the high frequency channel other...

Page 95: ...s request No Incoming guard sec 60 seconds CT108 assumed on No Xon character 017 CT105 as request No Xoff character 019 CT103 as request No Transmission Asynchronous CT107 as clear No Mode Full duplex CT107 assumed on No Speed 1200 bits sec Auto answer Yes Format bits 8 bits Connect CT105 CT109 No Format parity No parity CT109 enables CT106 No Format stopbits 1 stop bit Connect CT105 CT106 No Echo...

Page 96: ...C 4 C 2 V 24 CABLE BETWEEN SOPHO LAM AND MODEM When the SOPHO LAM is used in a convertor configuration it must operate in the DTE mode In this mode the test circuits CT141 and CT142 are used to provide full DTE functionality So a few V 24 circuits are not used according to the CCITT V 24 recommendations Therefore a special cable has to be used between the SOPHO LAM and the modem Figure Figure C 1 ...

Page 97: ...3 14 25 CABLE CONNECTOR AT SOPHO LAM SIDE CABLE CONNECTOR AT MODEM SIDE 1 13 17 18 17 18 2 3 4 6 7 24 25 20 8 22 11 2 3 4 6 7 24 25 20 8 22 11 Circuit CT103 A CT104 B CT105 C CT115 D CT141 E CT107 F CT102 G CT113 L CT142 M CT108 H CT109 I CT125 J CT126 K Circuit B CT103 A CT104 I CT105 L CT115 J CT141 H CT107 G CT102 D CT113 K CT142 F CT108 C CT109 E CT125 M CT126 ...

Page 98: ...LEASED LINE CONFIGURATION Figure Figure C 2 Leased Line Configuration with SOPHO LAM convertor shows the leased line configuration with SOPHO LAM convertor SOPHO LAM CONNECTOR MODEM CONNECTOR PIN CIRCUIT MNEMON IC PIN CIRCUIT MNEMON IC 7 CT102 GND Connected to 7 CT102 GND 3 CT104 RCD Connected to 2 CT103 TMD 2 CT103 TMD Connected to 3 CT104 RCD 8 CT109 DCD Connected to 4 CT105 RTS 4 CT105 RTS Conn...

Page 99: ...nnection between the modems as long as the remote terminal is operational So the connection is only cleared when the remote terminal is switched off In the following sub sections the operation of the SOPHO LAM convertor configuration is described without dialling protocol information So the required V 25bis Hayes and keyboard dialling commands are not described For a detailed description of these ...

Page 100: ...all request DTE B can initiate a call request by typing some characters Note that CT103 can only be used as call request provided CT108 CT107 CT105 and CT106 of the SOPHO LAM are ON After the call request the SOPHO LAM establishes a connection to a fixed destination The SOPHO LAM uses either Predefined Destination Dialling the hotline facility or keyboard dialling Call clearing In both situations ...

Page 101: ...rcuit is connected to CT108 of MODEM A In return the MODEM A activates CT107 which is connected to CT108 of the SOPHO LAM At this moment the SOPHO LAM accepts the call from DTE A Because the analogue connection is already present DTE A is directly connected to DTE B If the analogue connection is not present the MODEM A does not return CT109 In this situation the SOPHO LAM does not accept the call ...

Page 102: ... configuration silent mode result codes disabled Hayes command ATQ1 Automatic answering ON Hayes command ATS0 1 CT107 indicates the state of the analogue connection according to the V 24 specification Hayes command AT S1 when CT108 changes from ON to OFF the modem must go on hook Hayes command V 24 V 24 2B D 2B D IMP 64 kbps IMP 64 kbps V 24 DCE SOPHO LAM DLC DTX I DLC DTX SN 2 3 4 4 1 1 MODEM MOD...

Page 103: ...rstand the call phase diagram note the following a circuit number means that the circuit is in the ON state active a circuit number followed by a O means that the circuit is in the OFF state deactive the conversation mode during data transfer and clearing is not described CT105 and CT109 interactions DTE B dials the convertor group DNR ALC side of convertor pool using for example Hayes commands MO...

Page 104: ... When CT105 is used as call request the carrier of MODEM B initiates a call request via CT109 DCD of MODEM A In this case the connection between DTE A and the SOPHO LAM convertor is cleared when the line connection is out of synchronisation DTE A USER A USER B DIGITAL CONNECTION CONVERTOR ANALOGUE CONNECTION TA A ISPBX ISPBX SOPHO LAM MODEM A MODEM B DTE B CT108 CT105 RINGING CT108 CT107 Call requ...

Page 105: ...ial the DNR of DTE A using one of the dialling protocols offered by the SOPHO LAM keyboard dialling Hayes commands or V 25bis TA A activates CT125 after receiving an incoming call TA A answeres the call either after receiving an active CT108 or directly when CT108 is already present After synchronisation and after DTE A has activated CT105 MODEM A receives an active CT105 The reason for this is th...

Page 106: ...es an active signal at CT105 an goes off hook Now DTE A has a transparent connection with the MODEM A Note that MODEM A in figure Figure C 5 Call Phase Diagram for an Outgoing Call operates in the CT108 2 mode Otherwise MODEM A would DTE A USER A USER B DIGITAL CONNECTION CONVERTOR ANALOGUE CONNECTION TA A ISPBX ISPBX SOPHO LAM MODEM A MODEM B DTE B RINGING ANSWER CONNECT ANSWER ANSWER CT107 CT108...

Page 107: ...e active CT109 of MODEM A is signalled to TA A via the Proprietary protocol V 110 or X 30 after which TA A also activates CT109 After these interactions there is a transparent connection between DTE A and DTE B C 4 3 Call Clearing from the ISPBX side Figure Figure C 6 Call Phase Diagram for Call Clearing from ISPBX side shows the call phase diagram for clearing a call from the ISPBX side Figure C ...

Page 108: ...the ISPBX side Figure C 7 Call Phase Diagram for Call Clearing from Remote side DTE B clears the call by deactivating CT108 As a result MODEM B goes on hook and MODEM A deactivates CT109 The condition of CT109 connected to CT105 of the SOPHO LAM is signalled to CT109 of TA A via a frame bit Meanwhile MODEM A also deactivates CT107 after which the SOPHO LAM goes on hook This is signalled to TA A us...

Page 109: ...bit 6 direct fixed inc don t care bit 1 constant carrier don t care use low use low use low answering do not guard line DCD CT is incoming seizure DCD CT109 No is 161C 1622 161C 161E 1614 161A 1616 1624 1618 1626 160C 1612 160E 1620 1610 1622 160C 161C 160E 1620 1614 1624 1616 1610 161E 1612 1622 1618 1626 161A 160C 1614 1610 1618 160E 1608 byte 0 D 18 Leased line board Convector board use high us...

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