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ATT DEFINITY Communications System Generic 3 Instructions Manual
ATT DEFINITY Communications System Generic 3 Instructions Manual
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Integrated Services Digital Network (ISDN) — Basic Rate Interface (BRI) Issue 3 March 1996 3-797 Administered Connections An Administered Connection is an end-to-end connection between two access endpoints or d ata endpoints that is automatically established by the system whenever the system is restarted or the Administered Connection is a dministered and the Administered Connection is due to be active. The attributes of these connections are user-defined and administered on the “Administered Connection” form via the G3-MT. Once the ADM has been a dministered as one endpoint of an administered connection, the system waits for the scheduled time to set u p the connection. At the scheduled time, the system establishes the connection and maintains it for the specified length of time. Once the call is accepted, the set enters into the continuous mo de for the specified length of time. If the switch is reboote d during the continuous connection, the connection reinitiates the call setu p. At any time that the connection drops (for examp le, disconnected cabling), the switch re-initiates the call setup. Call Request The DEFI NI TY s yst em Generic 3 call processing handles all various BRI Bearer data call requests that are presently defined. Some capabilities that are not supported by AT&T terminals may be provided by a non-AT&T terminal. The switch completes most call requests. For those c a pabilities the switch does not support, a proper cause value is sent back to the terminal. Cause Value BRI stations receive a cause or reason c o de that identifies why the call is being cleared. The BRI data modules convert certain cause values to text messages and d isplays them for the user. Considerations The system supports up to 60 simultaneous voice calls on a BRI since two 7507 terminals (that support 30 call ap p earances/bridged appearances each) can be administered on a BRI port. The following features are not provided to BRI users: nSince the ISDN-BRI protocol requires that the Bearer Cap a bility must be specified at the time of sending the SETUP message (and cannot be changed during the call), the following data functions are not provid e d to the BRI voice users: — One b utton voice call setup transfer to d ata — One b utton data call setup transfer to voice — Preindication of a data call — Voice call transfer to d ata and data call transfer to voic e
Feature Descriptions 3-798Issue 3 March 1996 These functions require a change in the Bearer Cap a bility after the establishment of the call, which is currently not allowed by the BRI protocol. nFeatures that use the switchhook and Recall button (for example, Call Waiting and Analog Conference/Transfer/Hold/Drop) are a p plicable to analog voice terminals only The DEFI NI TY s yst em s u pports BRI data endpoints that perform layer 2 disconnect. BRI data endpoints that support layer 2 disconnect are administered as non-Management Information Message (MIM) supporting data only endpoints. The DEFI NI TY s yst em s u pports non-AT&T BRI voice and data terminals that perform enbloc sending using any one of the following formats: nA S ETUP message with all the digits in the Keypad IE and a Sending Complete IE. nA S ETUP message with all the digits in the Called Party Number IE and a Sending Complete IE. nA SETUP message with all the digits in the Called Party Number IE and no Sending Complete IE. If you are using a 7506D or 7507D to make calls that require a d ditional digits, you can place a comma in the dial sequence after you receive a second dial tone or after the call has been set up. The comma is used to separate the called number from subsequent information. Interactions The following features interact with the ISDN-BRI services: nData Button Besides the call appearance and feature function buttons, BRI voice/data terminals have a fixed, dedicated data button (button 7 on the 7505D and 7506D voice terminals, and button 31 on the 7507D voice terminal) that is used for data call setup. In g eneral, feature function buttons such as Call Forwarding or Send All Calls buttons are always associated with voice features, and cannot be used in conjunction with the data button. For example, the user cannot activate call forwarding for the associated data endpoint by using the data button followed by the Call Forward ing button and the designated extension. nInterworking The same off-premises call types are permitted as for DCP, with the exception of voice to data and data to voice transfer.
Integrated Services Digital Network (ISDN) — Basic Rate Interface (BRI) Issue 3 March 1996 3-799 nModem Poolin g The Modem Pooling feature provides the necessary protocol conversion between Mode 2 digital data endpoints and analog data facilities. A modem pool resource needs to be inserted by call processing during call setup for both call origination and c all answering. This resourc e translates data between DMI Mode 2 protocol used by BRI data endpoints and the modulated signal used by the modem. nPre-Selection When an ISDN-BRI station assigned with the “Select Last Used Appearance?” field of the “Station” form set to yes completes a transfer while off-hook using the handset, the user will be left hearing a dial tone on the last-used appearance, rather than the silence heard in the same situation by an user of other station types. nVoice Terminal Display BRI terminals take control of the disp lay. For example, when the user is in dialing state (BRI terminal is in the Overlap Sending state) any display information sent to the terminal from the switch is buffered until the state changes and is displayed when the state changes. The 7506 BRI voice terminal, which has a 2-line 24-character display, splits a message when it recognizes a b lank closest to the 24th c haracter. This is left to the discretion of the terminal. As a result, the switch has no control over it. nBusy Tone Forward Disconnect BRI terminals require that the Busy Tone Forward Disconnect (BTFD) feature b e turned off. With BTFD of f, an a g e nt (with Malicious Call Trace) is able to change states after a call. Administration BRI Voice/Data Administration of BRI voice terminals requires all the fields associated with the standard DCP station administration. Ad ditional fields are used to enter the following information: nTEI information: If the BRI terminal supports a fixed TEI value, it has to be entered at the time of station administration. The allowed values are 0 through 63. There are two fields: “Fixed TEI” and “TEI Value” . If the answer to the first field is yes, the second field shows u p where the TEI value is administered. The TEI value on the “Ad ministration” form must match the value supported by the terminal. nMIM support: This is an “ A dministrable” field on the “BRI Station” form. If the answer to this field is ‘‘yes,’’ the following two fields need to be filled in:
Feature Descriptions 3-800Issue 3 March 1996 1. Endpoint Initialization: If the BRI terminal supports endpoint initialization, the administrator has to enter the SPID value. The default value is the extension; however, the value can be changed at the time of a dministration. The SPID can be up to 10 digits, and uniquely identifies the terminal on the BRI. The SPID on the “ Administration” form and the SPID programmed into the endpoint must be the same. (Refer to the terminal’s user manual in ord er to change the terminal’s SPID.) All SPIDs must be d ifferent for each endpoint on the same port. All SPIDs must be different from the service SPID, which is administered on the “System Maintenance” form. 2. MIM Maintenance / Management sup port: This is another BRI specific field that indicates if the terminal supports other maintenance and management messages. For multipoint (passive bus) environment, the system administration checks the number of B-channels used for a port. Administration denies any attempt which might cause call blocking by restricting the numb er of en d points on a port. NOTE: Separate extensions numbers are used for voice and d ata calls to the same endpoint. Any PC/ISDN Platform configuration (stand-alone, with handset/headset, or with voice terminal) should be administered with MIM support set to ‘‘no’’. Other administrable features depend on the PC software application (if the application supports data transmission, the ‘‘Data Module’’ field must be set to ‘‘yes’’). BRI Data The 7500 Data Module is a dministered through the “Data Module Ad ministration” form. The ADM is a dministered through the “Station Ad ministration” form, using the data module administration p a ge. In add ition to the fields used by the DCP endpoints, the following new fields are used for BRI data module administration: nDefault Duplex: Full/Half (default Full) nDefault Mo de: Synchronous/Asynchronous (default Asynchronous) nDefault Speed: 1200, 2400, 4800, 9600, 19200, 56000, and 64000 (default 1200) (In synchronous mode, the speed of the 7500 data module may be set to 56,000 or 64,000 bps.) nDefault Data Ap p lication: mode 0, mode 1, mode 2 sync, mode 2 async, and mode 3/2 adaptable Default Duplex, Default Mode, and Default Speed values are used for initializing data module d efault attributes. The defaults are required for modem pooling conversion resource insertion when the en d point does not support MIM query
Integrated Services Digital Network (ISDN) — Basic Rate Interface (BRI) Issue 3 March 1996 3-801 capability. If you are using supported end p oints (7500 and ADM), you should not change the d efault values. Changing the default values with the MIM Maintenance/Management support o ption as ‘‘y’’ has no effect on modem pooling. These endpoints support the MIM query capability, which enables the switch to query the endpoint when a call arrives. Default Data Ap p lication specifies the default data protocol to b e used for originating data calls if mode is not sp ecified with the calling parameters. This mode is also use d for Administered Connections and for terminating trunk calls that do not have bearer capability specified. Data mo dules that sup p ort two simultaneous data calls should be administered as a 7500 and the MIM Maintenance/Management support option should be set to ‘‘n.’’ NOTE: Two simultaneous data calls to a single endpoint use the same extension numb er. Hardware Requirements BRI services require the following hardware: nThe TN778 Packet Control circuit pack. This circuit pack provides the interface to the LAN (packet) bus on G3i (but not G3r) for establishing the signaling connectivity. nThe TN556 BRI p ort circuit pack, which is the Basic Rate Line circuit pack. Each BRI p ort board c an support 12 line interfaces, each operating at 192 kbps. nA TN2198 two-wire BRI port circuit pack can be used in place of the TN556. In this case an NT1 is also required. nISDN-BRI Typ e B and Type D Terminal Management S/T interface terminals. nThe AT&T ISDN 7505, 7506, 7507, 8503T, 8510, and 8520 voice terminals. nThe 7500 Data Module and the ADM. The ADM is supported by the AT&T ISDN 7505, 7506, and 7507 voice terminals with firmware version FP2.0 or later. nThe PC/ISDN Interface card used in conjunction with a standard PC and one to four voice terminals. See the PC/ISDN Platform Installation and Reference manual, 555-016-102, for a d ditional information. Also see the PC Interface feature d esc rib e d in this book.
Feature Descriptions 3-802Issue 3 March 1996 Integrated Services Digital Network (ISDN) — Primary Rate Interface Feature Availability ISDN-PRI is an optional feature that can be purchased with any Generic 3 releases except G3vs/G3s ABP. Description Allows connection of the system to an Integrated Services Digital Network (ISDN) by using a standard ISDN frame format called the Primary Rate Interface (PRI). The ISDN gives the system users access to a variety of public and private network services and facilities. The ISDN-PRI standard consists of layers 1, 2, and 3 of the Open System Interconnect (OSI) model. In ISDN-PRI, the transmission standard for layer 1 (the physical layer), is either DS1 (T1) or CEPT1 (E1). The DS1 (T1) is a digital transmission standard that in North America carries traffic at the digital signal level-1 (DS1) rate of 1.544 Mbps. T1 facilities are also used in Japan and some Middle-Eastern countries. It consists of a 1.536 Mb ps signal multiplexed with an 8 kbps framing channel. The 1.536 Mb ps signal is divided into 24 channels (DS0s) of 64 kbps each, numb ered 1 - 24. The ‘‘D’’ (data) channel multiplexes signaling messages for the ‘‘B’’ (bearer) channels carrying voice or data. When a D-channel is present, it o c cupies Channel 24. The CEPT1 (E1) is a d igital transmission standard that carries traffic at a rate of 2.048 Mbps. It is used in Europe and elsewhere. The E1 facility is divided into 32 channels (DS0s) of 64 kpbs information numb ered 0-31. Channel 0 is reserved for framing and synchronization information. When a D-channel is present, it occupies channel 16. The DEFI NI TY s yst em of f ers several administrable protocols, each of which provides a different set of services that ISDN-PRI allows. For country 1 (U.S.A.), users can administer either the AT&T Switched Network or National ISDN-2. These protocols are discussed in detail later in this section. For other countries, the DEFINITY system provides a Global ISDN-PRI. This includes any combination of services, including (but not limited to) Basic Call, DDI, Disp lay, and QSIG. The services available with Global ISDN-PRI are country-dependent. (Please refer to the QSIG Global Networking feature. ISDN-PRI signaling in the system is supported by the TN767 (for 24 channels) or the TN464C or later version (for 24 or 32 channels) DS1/E1 Trunk circuit packs, coupled with (for all releases except G3r) the TN765 Processor Interface circuit pack. The D-channel (signaling channel) is switched through the TN765 circuit pack.
Integrated Services Digital Network (ISDN) — Primary Rate Interface Issue 3 March 1996 3-803 NOTE: For G3r, the D-channel information can only use the TN464C (or later version) circuit pack; TN767 can be used for NFAS interfaces carrying only B-channels, but not for ISDN signaling information (D-channel). With the ISDN-PRI, the system can interface with a wide range of other products including network switches, PBXs, and host computers. These products include the following: nPublic Network switches (for example, 4ESS, 5ESS, Northern Telecom DMS250, etc.) nDEFI NI TY Com munications System Generic 2 and System 85 R2V4. nDEFI NI TY Com munications System Generic 1 nDEFI NI TY Com munications System Generic 3 nSome of the other products that adhere to the ISDN-PRI signaling protocol. As an example of how the ISDN-PRI is used in private and public network configurations, see Figure 3-20 and Figure 3-21. As seen in these figures, the ISDN-PRI c a n b e u se d to interface a PBX to a Public Switched Network, a PBX to a Host Computer, or a PBX to another PBX. Figure 3-20. ISDN-PRI Private Network Configuration ISDN-PRI DEFINITY COMMUNICATIONS SYSTEM HOST COMPUTERDEFINITY COMMUNICATIONS SYSTEM DEFINITY COMMUNICATIONS SYSTEM
Feature Descriptions 3-804Issue 3 March 1996 Figure 3-21. ISDN-PRI Public Network Configuration AT&T Switched Network Protocol The AT&T Switched Network Protocol is an ISND-PRI protocol that uses 4ESS implementation. The DEFI NIT Y syst em ISDN-PRI implementation is consistent with the ITU-T Recommendation Q.931 and Q.921 for ISDN signaling. The AT&T Switc h ed Network provides system users with the following services: nAccess to AT&T Switched Network Services (for example, SDN, MEGA, etc.) nCall Identification Display — Calling Party Num ber (CPN) — Billing Number (BN) — Calling and Connected Number Display — Calling and Connected Party Name Display nCPN/BN to Host Call Identification nPrivate Network Services nWideband (NxDSO, H0, H11, H12) (both private and public networks) nCall-by-Call Service Selection These services are discussed in detail in the following subsections. ISDN-PRI DEFINITY COMMUNICATIONS SYSTEM HOST COMPUTERPUBLIC SWITCHED NETWORK (4 ESS)DEFINITY COMMUNICATIONS SYSTEM DEFINITY COMMUNICATIONS SYSTEM ISDN-PRI
Integrated Services Digital Network (ISDN) — Primary Rate Interface Issue 3 March 1996 3-805 Access to AT&T Switched Network Services ISDN-PRI pro vides access to AT&T Switched Network Services such as SDN (Software Defined Network), SDDN (Software Defined Data Network), MEGACOM, etc. An ISDN-PRI trunk group may be dedicated to a particular feature. Alternately, an ISDN-PRI call-b y-call trunk group may provide access to several features. For a description of the ASN services accessible via ISDN-PRI (either via dedicated or call-by-call trunk groups) see the Call-by-Call Service Selection feature description elsewhere in this document. Call Identification Display ISDN-PRI Call Identification Display provides a transparent name/number d isplay for all display-equipped voice terminals within an ISDN-PRI network. The feature is transparent in that the same information is provided at all ISDN-PRI facilities. Voice terminals using this feature should be digital voice terminals with a %40-character alphanumeric display. The Merlin hybrid sets with 32-character displays (7315H and 7317H) also support this feature. ISDN-PRI Display Information is provid e d in addition to the normal Voice Terminal Display and Attendant Display features, when the network supports end-to-end ISDN-PRI connectivity. When both ISDN-PRI and DCS d isplay information, or DCS display information only, are received, the switch displays the DCS display information in the DCS format. If ISDN disp lay information is received, and no DCS display information is received, then the ISDN display information is displayed in the ISDN formats. Two types of identification numb ers are provided with the ISDN-PR I. These identification numbers may be used in the various typ es of displays used with the ISDN-PRI. The two types of identification numbers are as follows: nCalling Party Num ber (CPN): A 0 to 15 d igit DDD number ass o ciated with a specific station. When a system user makes a call that uses the ISDN, that user’s CPN is provided by the system for the ISDN. The “CPN Prefix” form is administered to create a 0-15 digit CPN from a local station number. nBilling Number (BN): The calling party’s billing number that is provided to an inter-exc hange network via Equal Ac cess or Centralized Automatic Message A c counting (CAMA). This number is stored at either a local or network switch. If a customer is connected directly to the AT&T network, the BN is the customer’s billing numb er stored in that network. If the CPN is not provided on an incoming ISDN-PRI c a ll, the system uses the BN for the station identification numb er. The following types of display information are provided with the ISDN-PRI. nCalling Party’s Number The calling party’s number is shown on the called p arty’s display. On calls generated from a DEFINITY system, the calling party’s number is a 0- to 15-digit DDD number. This number is provided only if the outgoing ISDN-PRI trunk group is administered to send the CPN and if the “ CPN
Feature Descriptions 3-806Issue 3 March 1996 Prefix” form is a dministered to c reate a CPN. For G3vs/G3sV1, G3iV1, and G3rV1, the Calling Party number, if sent, is always 10 digits long. On calls incoming to a system, the network may provide either the CPN or BN as the calling party’s numb er. Exc ept for G3i-Global, dashes are inserted in the displayed number between the area code (if shown), the office code, and the local number. Extension numbers and 12-digit international numbers are shown without dashes. For G3V2 and later releases, dashes are only used for 7-digit and 10-digit numbers when the ‘‘North American Area Code’’ field is administered on the ‘‘Dial Plan” form.’ nCalling Party’s Name The calling party’s name is shown on the called party’s display. On calls generated from a DEFINITY system, the calling party’s name is provided if the ISDN-PRI trunk group is administered to send the name to the network. On calls incoming to a DEFINITY system, the (p ublic or private) network may provide the calling party’s name. If the calling party’s name is not available, the called party’s display shows ‘‘CALL FROM’’ instead, followed by the calling party’s number (if available). nConnected Party’s Number The connected party’s number is shown on the calling party’s display. On calls generated from a DEFINITY system, the called party’s number is shown on the calling party’s display as the calling party dials the number. If the (public or private) ISDN network provides the connected party’s number, the calling party’s display is u pdated to show the connected party’s number. The format of the connected party’s number is the same as that of the calling party’s number described previously on calls incoming to a DEFI NIT Y syst em . The 0-15 d i git number of the p arty who answers the call is provided to the ISDN network only if the incoming ISDN-PRI trunk group is administered to send the CPN to the network and the “ CPN Prefix” form is a dministered to create a CPN. NOTE: The connected party may or may not be the party actually called. For G3vs/G3sv1, G3iV1, and G3rV1, the connected party number, if sent, is always 10 digits long. nConnected Party’s Name The connected party’s name is shown on the calling party’s display. On calls generated from a DEFINITY system, the (public or private) ISDN network may provide the connected party’s name to the DEFINITY syst em, when the call is answered. If the connected party’s name is not available, the calling party’s disp lay shows ANSWERED BY, followed by the connected party’s numb er (if available).