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ATT DEFINITY Communications System Generic 3 Instructions Manual
ATT DEFINITY Communications System Generic 3 Instructions Manual
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Functional Description
2-22Issue 3 March 1996
Data Management Features
The following features are associated with Data Management:
nAdministered Connections
nAlphanumeric Dialing
nData Call Setup [including Default Dialing and Alphanumeric Dialing]
nData Hot Line
nData-Only Off-Premises Extensions
nData Privacy
nData Restriction
nDefault Dialing
nDigital Multiplexed Interface
nDS1/E1 Tie Trunk Servic e
nEIA Interface
nInformation System Network (ISN) Interface
nModem Poolin g
nPC Interface...](http://img.usermanuals.tech/thumb/575/85180/w64_definity-g3-feature-description_d-127.png "Page 128
Functional Description
2-22Issue 3 March 1996
Data Management Features
The following features are associated with Data Management:
nAdministered Connections
nAlphanumeric Dialing
nData Call Setup [including Default Dialing and Alphanumeric Dialing]
nData Hot Line
nData-Only Off-Premises Extensions
nData Privacy
nData Restriction
nDefault Dialing
nDigital Multiplexed Interface
nDS1/E1 Tie Trunk Servic e
nEIA Interface
nInformation System Network (ISN) Interface
nModem Poolin g
nPC Interface...")
Network Services Issue 3 March 1996 2-25 Electronic Tandem Network (ETN) An Electronic Tandem Network (ETN) is a hierarchical network of privately owned trunk and switching facilities that can provide a cost-effective alternative to toll calling between locations. An ETN consists of tandem switches, the intertandem tie trunks that interconnect them, the access or bypass tie trunks from a tandem switch to a main switch, and the capa bility to control call routing over these facilities. A Main/Satellite/Tributary configuration can be served by an ETN or a DCS can also be p art of an ETN. The system can serve as an ETN tandem switch. Within an ETN each location is i dentified by a unique private network office code. With G3i, this private network office code may be of the form RN, RNX, RX, XX, RNX, RXX, XXX, and RNXX, depending on administration (R = digits 2 through 9, N = di gits 2 through 9, and X = digits 0 through 9). After accessing the ETN, the user simp ly dials the private network office code plus the d esired extension number, for a total of ten digits or less. Private network office codes are unique within an ETN. Private network office codes are assigned when the ETN is established. When Direct Inward Dialing (DID) is provided by the local central office, the extension numbers (last four digits of the number) will match. Network Inward Dialing (NID) is the ETN equivalent of DID and can be provided without DID. The software program that controls call routing over an ETN is called Automatic Alternate Routing (AAR). AAR not only determines the route for a call, but, through the Facilities Restriction Level (FRL) function, d efines up to eight levels of calling privileges for users of the ETN. Another function of AAR, Subnet Trunking, can convert an on-network number to a public network or international number. This function is useful when all on-network routes are busy or are not provided. The details of Automatic Alternate Routing, Facilities Restriction Level, and Subnet Trunking are provided in this chapter. AAR digit conversion can be used to convert private network numbers to other private network numbers or public network numb ers. This allows the system to steer some AAR calls to other switches in the private network or, by changing specific dialed digits to a p ublic network number, eventually route some calls via ARS. Also, unauthorized private network calls can be route d to an attendant or receive intercept treatment. Details on AAR digit conversion can be found in the Automatic Alternate Routing feature description. Distributed Communications System (DCS) A Distributed Communication System (DCS) is a cluster of private communications switches (nodes) interc onnected among several geographic locations. These switches can be either a DEFI NI TY Generic 1, DEFINITY Generic 2, DEFI NI TY Generic 3, System 75, System 85, or DIMENSION PBX.
Functional Description 2-26Issue 3 March 1996 Refer to the System Parameters table In Appendix A for the node limitations of each system type. An attribute of a DCS configuration that distinguishes it from other networks is that it appears as a single switch with respect to certain features. This provides simplified dialing procedures between locations, as well as the convenience of using some of the system’s features between locations. DCS is particularly useful if there is frequent interlocation calling. Each DCS node is connected with every other DCS node by tie trunks or ISDN-PRI trunks (DEFINITY Generic 3) for voice communications and data links that send and receive control and feature information. However, each DCS node does not have to be directly connected to every other node. Communication may be through a DCS tandem node. The data links and voice channels may be directly between nodes or may pass through a tandem node. Nodes that cannot serve as a tandem node (that is, those that cannot receive information from one node and pass it on to another node) are called endpoints (or endpoint nodes). Nodes that can pass information are simply referred to as nodes. DEFINITY Generic 3i can serve as either an endpoint node or a regular (tandem) node. Figure 2-6 shows a typical DCS configuration. A DCS can consist of all end points. That is, each node in the DCS may be directly connected by data links and voice channels with every other node in the DCS. Some of the applications of the DCS configuration are as follows: nIn a ‘‘campus environment’’ that has two or more separate buildings and the nodes are connected by local cable. nIn a larger area such as a city, several states, or even the entire country, where the nodes are separated by distances too great for local cable and may be connected to different central offices. A DCS has the property of ‘‘transparency’’ with respect to inside calling and some features. Transparency is the ability of the system, from the user’s standpoint, to operate across several nodes in the same way it does at the local node. This allows users to dial from any terminal to any other terminal within the DCS without regard for which nodes are involved. Likewise, transparency allows certain voice features to b e used across nodes.
Network Services Issue 3 March 1996 2-27 Figure 2-6. Typical Distributed Communications System Some voice features have transparency in a DCS configuration. The following voice features have unique aspects in a DCS environment and are d esc rib e d in detail in this book. nDCS Alphanumeric Display for Terminals nDCS Attendant Call Waiting (described under DCS Call Waiting) nDCS Attendant Control of Trunk Group Ac cess nDCS Attendant Direct Trunk Group Selection nDCS Attendant Display nDCS Automatic Callback nDCS Automatic Circuit Assuranc e nDCS Busy Verification of Terminals and Trunks nDCS Call Coverage TIE TRUNKS SYSTEM B ENDPOINT NODE TIE TRUNKS DATA LINKCO OUTSIDE TRUNKS MAIN LOCATION BRANCH CO OUTSIDE TRUNKSRELEASE LINK TRUNKS*DATA LINK TIE TRUNKS DATA LINK CENTRALIZED ATTENDANT SERVICE CO CO OUTSIDE TRUNKS OUTSIDE TRUNKS SYSTEM D (SYSTEM A) SYSTEM C ENDPOINT NODE * REQUIRED ONLY IF THE NETWORK HAS OPTIONAL CENTRALIZED ATTENDANT SERVICE. RELEASE LINK TRUNKS ARE NOT REQUIRED FOR DCS. WITH V2, SYSTEM 75 CAN ONLY BE AN ENDPOINT IN DCS.
Functional Description 2-28Issue 3 March 1996 nDCS Call Forward ing All Calls nDCS Call Waiting — Termination (described under DCS Call Waiting) nDCS Distinctive Ringing nDCS Leave Word Calling nDCS Multi-Appearance Conference/Transfer nDCS Priority Calling (described under DCS Call Waiting) nDCS Trunk Group Busy/Warning Indication. nEnhanced DCS (described under Enhanced DCS). Abbreviated Dialing and Last Numb er Dialed also have transparency in a DCS configuration. These features o perate the same in a DCS as they do at a single switch. A DCS cluster can consist of up to 64 nodes. Since AUDIX and the Call Management System (CMS) and ISDN-PRI each require the same data link facilities as a node, each of these included in the system reduces the number of available d ata links, which, depending on the system configuration, may reduce the maximum number of nodes. Use of the DCS over the ISDN-PRI D-channel feature on the other hand, may increase the maximum number of nodes. (Note that on G3r, ISDN-PRI d oes not require the same data link facilities as a node.) DCS Message Hopping lets a DCS message route through an intermediate node without tandeming an associated trunk call. This is accomplished through the use of hop channels. The system provides Message Hopping through up to two hops. DCS transparency is more restricted when the tandem node is an Enhanced DIMENSION PBX or a System 85 Release 2 Version 1 than when it is a System 85 Release 2 Version 2, or later, or a DEFINITY Generic 2.1, or later. (See the DCS Alphanumeric Display for Terminals and DCS Leave Word Calling features.) Certain feature capabilities are unique to a particular type of node (for example, a D EFI NITY Generic 3 endpoint node). Therefore, a d etailed feature description should be consulted for each type of node. The Centralized Attendant Service (CAS) feature can be used as an advantage in DCS networks where all attendants are at one node. CAS reduces traffic volume on interconnecting tie trunks caused by incoming attendant-seeking calls at the endpoint nodes. DEFI NIT Y Generic 3 can serve as the main location for CAS attendants. Centralized Attendant Service capabilities are given in detail in this manual. With DCS Call Coverage (G3V4 and later releases), calls to an extension on one system can be covered by extensions administered as coverage points on
Network Services Issue 3 March 1996 2-29 remote systems. DCS Call Coverage provides transparenc y across systems for the Call Coverage feature. Main/Satellite/Tributary Figure 2-7 shows a Main/Satellite/Tributary configuration. It can function independently or serve as an ETN access arrangement. For a Main/Satellite configuration, attendant positions and public network trunk facilities are concentrated at the Main, and calls to or from satellite locations pass through the Main. To a caller outside the Main/Satellite complex, the system a p pears to be a single switch with one Listed Directory Number. This is accomplished with the optional Uniform Dial Plan software. Tributary and Satellite locations are similar except that a Tributary has one or more attendant positions and its own Listed Directory Number. DEFI NI TY Generic 3 can serve as a Main, Satellite, or Tributary. A small business can start with a single Main/Satellite or Main/Tributary complex and add trunk and switching facilities as the business grows. In this situation, tie trunks connect the main locations within an urban area and intercity traffic is routed via the p ublic network. This arrangement favors a medium-size organization or one that has small isolated locations where the intercity traffic is too small to justify the cost of tie trunks. Figure 2-7. Main/Satellite/Tributary Configuration TIE TRUNKS SATELLITE TRIBUTARY SYSTEM SYSTEM MAIN
Functional Description 2-30Issue 3 March 1996 Trunking Trunking is the use of communications links to interconnect two switching systems, such as connecting the switch to a local central office or to another switch. These links, called trunks, can be grouped together in Trunk Groups when all the trunks in the group perform the same function. This g rouping simplifies administration since the required service characteristics (parameters) are assigned to the group rather than to each trunk. Grouping also simplifies call processing. Calls requiring a trunk are routed to the appropriate trunk group and an idle trunk, if available, is selected from the group. There are analog trunks and digital type trunks. The type of signal is specified for each trunk in the list below. The following types of trunk groups can b e used with the system: nAuxiliary — Provides internal trunk a p plications for features such as Loudspeaker Paging and Music-on-Hold. This is an analog signal. nCO — Provides a link with the local Central Office (CO) for Direct Outward Dialing (DOD) and manually completed incoming calls, not Direct Inward Dialing (DID) calls. The signals may be analog or digital nDirect Inward Dialing (DID) — Provides a link with the local CO that is only usable for incoming calls and allows the CO to send d igits to the PBX so the call can be routed to a particular station. The signal can be analog or digital nDirect Inward/Outward Dialing (DIOD) — Provides a link with the local CO that allows digits to be sent in either direction for incoming and outgoing calls. The signal can be either analog or digital nDS1/E1 Tie Trunk — Provides for two types of digital tie trunk interfaces: Voice-Grade DS1/E1 and Alternate Voice/Data (AVD) DS1/E1 tie trunks. The Voice-Grade DS1 tie trunks are an alternative to four-wire analog E&M tie trunks and may be used to interface with other properly-equipped switching systems. AVD DS1/E1 tie trunks permit alternate voice and data calling between a System 75, DEFI NIT Y Generic 1, DEFI NI TY Generic 3 and a System 85 or DEFINITY Generic 2. DS1/E1 tie trunks also can be used with Release Link trunks for Centralized Attendant Service, and can be used with AT&T unbanded telecommunications service. (d igital signal) nFX — Provides a link with a CO other than the local CO. (analog or digital signal) nISDN-PRI — Provides end-to-end digital connectivity and supports a wide range of voice and non-voice services. Calls to a variety of switched nodal services and calls destined for different inter-exchange carriers can be processed. (digital signal) nTie a n d Release Link — Provide a link with another private switching system for calls between the systems. Release link trunks are used only with Centralized Attendant Service. The signal can be analog or digital. Tie trunks are used on calls to or from the following:
Network Services Issue 3 March 1996 2-31 — a Private Branch Exc hange (PBX) — an ETN switc h — an EPSCS or Common Control Switching Arrangement (CCSA) office — MEGACOM Service (AT&T unbanded long distance service.) nWATS —Provides access to a portion of the DDD network via d e dicated trunks to a WATS serving office. Each WATS trunk terminates as a WATS line in the WATS serving office. The trunks used are always one-way outgoing. Outgoing WATS calls to various geographic areas are ma de on an attendant-handled basis or a station direct-outward-dial basis. Signals can be analo g or digital. Tie trunks used with the system are administered as either internal or external. The internal or external designation controls the type of ringing (which is administrable) received at a voice terminal when an incoming tie trunk call arrives and controls the routing of the call if it is redirected through the Call Coverage feature. The d efault ringing pattern is the following: nIncoming internal tie trunk calls cause internal-call ringing and will redirect according to the redirection criteria administered for internal calls. nIncoming external tie trunk calls cause external-call ringing and redirect according to the redirection criteria administered for external calls. The number of bursts for internal/external/priority calls is a dministrable in G3i-Global and G3V2 and later releases. The Call Coverage feature interaction with Tie Trunks is described in detail in Chapter 3 of this manual. Selection of the trunk group to be used for a given call is determined by digit translation on the trunk access code by the AAR/ARS routing tables. Assuming an idle trunk in the selecte d group is found, a seizure signal (service request) is sent to the distant switch. If the distant switch requires the called number, a start dial signal is normally returned to the calling switch, indicating readiness to accept digit transmission. The start dial signal(s) used is dictated by the serving FX office, WATS office, or local CO. For interconnection with other private switching systems, the System Manager may select the start d ial signal(s) to be used. ‘‘Trunk typ e’’ refers to the physical design of a trunk circuit. Trunk type and the start dial signal are often used interchangeably, although trunk type is a more accurate term. A brief description of the available trunk types follows: nGround Start — A ground signal is sent over the trunk ring lead and is received over the trunk tip lead. nLoop Start — A closure signal is sent through the loop formed by the trunk leads.
Functional Description 2-32Issue 3 March 1996 nImmediate Start — No start dial signals are used. On outgoing calls, the system waits at least 80 milliseconds (a configurable amount of time) after sending the seizure signal b efore sending the digits required at the d istant switch. This gives the distant switch enough time to attach a digit receiver to the call. nWink Start — A momentary signal (wink) is sent to the distant switc h when the trunk is ready to receive digits. nDelay Dial — A steady signal is sent to the distant switch and is removed when the trunk is ready to receive d i gits. nAutomatic — No dialing is performed. The seizure signal sent or received is sufficient to route the call. The call destination is specified when the trunk group is administered. The destination can be the attendant group or any extension number assigned in the system. Trunk groups connecting with a WATS office, FX office, or local CO can be ground or loop start. DID trunk groups can be immediate or wink start. Tie trunk groups can be delay dial, wink start, immediate start, or automatic. Trunk groups can be one-way incoming, one-way outgoing, or two-way. Whether the trunk group is available for incoming, outgoing, or two-way traffic is called direction. A two-way loop-start trunk is subject to glare. Glare occurs when the distant switch is trying to use a given trunk for a call to a DEFINITY PBX at the same time the DEFINITY system is trying to use the same trunk for a call to the distant switch. Incoming calls are not a borted because of glare. The incoming call will complete, and the outgoing call will receive reorder tone (G3i and G3vs/G3s). In G3r and G3V2 and later releases, glare retry handling for two-way trunks is administrable. Queuing at both ends of a two-way trunk group compounds the possibility of glare and is, therefore, not recommended. Each non-DCS outgoing and two-way trunk group can have a queue. If all trunks in the group are busy, the call waits in the queue until a trunk becomes idle. The queue length, which is the number of calls waiting, may be from one to 100. A queue length of 0 (zero) indicates no queue has been established. This information is entered on the trunk group form when the trunk group is administered. Dual Tone Multifrequency (DTMF) (touch-tone) signaling or rotary dial (dial-pulse) signaling can be used between switches. The system can send or receive either type of signaling required by the distant switch as well as ISDN-PRI and R2-MFC and others. An incoming trunk call to the system can be connected to another trunk, a voice terminal, an attendant console, or an announcement. When the call is answered, ‘‘an answer supervision’’ signal is sent to the distant public network switching office. This signal initiates the recording of the call details normally used for charging. Any CO call route d outward is deemed ‘‘answered’’ 10 seconds (system d efault; however, this may be administered as higher or lower on the trunk group form) after the last d igit is dialed. Tie trunk calls are deemed
Network Services Issue 3 March 1996 2-33 ‘‘answered’’ when answer supervision is returned from the far end or when answer supervision time-out expires. Also, if there is a trunk incoming from one of the previously listed offices on a call of this type, then answer supervision is sent to that office. An incoming call to a Direct Department Calling (DDC) or Uniform Call Distribution (UCD) recorded delay announcement is deemed ‘‘answered’’ when the calling party is connected to the announcement. Other types of announcements, such as unassigned number announcements, are treated as an unanswered call.
Functional Description 2-34Issue 3 March 1996 System Management System Management provides the capabilities to control and maintain the system and also provides system usage reports to help determine if the system is being used as intended. In short, System Management allows the System Manager to establish the system, monitor its use, and make additions and/or changes as necessary. System management d evices are the Generic 3 Management Terminal (G3-MT) or the Generic 3 Management Adjunct (G3-MA). The G3-MA system management device is an enhanced PC-based administration system. !WARNING: Secure your system from unauthorized access by following the guidelines suggested in the GBCS Products Security Hand book, 555-025-600, and in the Security Measures section, Chapter 1. System Management features and functions are described in this chapter. Functions are more fully described in the following documents. nDEFI NI TY Com munications System Generic 3 V4 Implementation, 555-230-655 nDEFI NI TY Com munications System Generic 3 V2 Traffic Reports, 555-230-511 nDEFI NI TY Com munications System Generic 3r Maintenanc e, 555-230-105 Changes made to system translations are effected only at the single system for which the changes were made. If a system is part of a network, changes may need to be made at more than one system to effect the desired changes to the network. Similarly, changes intended for only a single system could affect the network. Therefore, the System Manager must understand the effect on the network before making any changes. System Management Features The following features are associated with System Management: nAdministration nAdvice of Charg e nCall Detail Recording (CDR) nCustomer-Provid e d Equip ment (CPE) Alarm nFacility Test Calls nMove Ag ent From CMS nRecent Change History nReport Scheduler and System Printer nSecurity Violation Notification