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Lucent Technologies DEFINITY Enterprise Communication Server Release 8.2 Administrators Guide
Lucent Technologies DEFINITY Enterprise Communication Server Release 8.2 Administrators Guide
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DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 407 Data Modules — general 15 CALLMASTER phones that have a connection to a data terminal or personal computer. The data modules integrate data and voice into the DCP protocol required to interface with the switch via a port on a digital-line circuit pack. Use the 7400B+ or 8400B+ instead of an MPDM when you need asynchronous operation at speeds up to 19.2-kbps to provide a DCP interface to the switch for data terminals and printers. The 7400B+ and 8400B+ do not support synchronous operation and keyboard dialing. Dialing is provided using the standard Hayes command set. 7400D This data module supports synchronous operation with AUDIX, CMS, and DCS. It provides synchronous data transmissions at speeds of 19.2-Kbps full duplex. 7400C High Speed Link The 7400C high-speed link (HSL) is a data-service unit that allows access to DCP data services. It provides synchronous data transmission at speeds of 56- and 64-Kbps and provides a link to high-speed data networks. Used for Group 4 fax applications that include electronic mail and messaging, and electronic storage of printed documents and graphics. Use the 7400C for video teleconferencing and LAN interconnect applications. 7500 Data Modules The 7500 Data Module connects data-terminal equipment (DTE) or data-communications equipment (DCE) to the ISDN network. The 7500 Data Module supports EIA 232C and V.35 interfaces and RS-366 automatic-calling unit interface (for the EIA 232C interface only). The 7500 has no voice functions. Configure in the following ways: nAsynchronous DCE 300, 1200, 2400, 4800, 9600, 19200-bps nSynchronous DCE 1200, 2400, 4800, 9600, 19200, 56000, 64000-bps nAsynchronous DTE (used for modem pooling) up to 19200-bps The 7500 Data Module is stand-alone or in a multiple-mount housing.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 408 Administered Connection 15 Asynchronous Data Module NOTE: The alias station command cannot be used to alias data modules. Use the Asynchronous Data Module (ADM) with asynchronous DTEs as a data stand for the 7500 and 8500 Series of ISDN-BRI phones, thus providing connection to the ISDN network. The ADM provides integrated voice and data on the same phone and supports data rates of 300, 1200, 2400, 4800, 9600, and 19200-bps. This module also supports the Hayes command set, providing compatibility with PC communications packages. Related topics Refer to ‘‘ Data modules’’ on page 558 for more information. Administered Connection An Administered Connection (AC) is a connection between two access or data endpoints. DEFINITY ECS automatically establishes and maintains the connection based on the attributes you administer. ACs provides the following capabilities. nSupport of both permanent and scheduled connections nAuto Restoration (preserving the active session) for connections routed over Software Defined Data Network (SDDN) trunks nAdministrable retry interval (from 1 to 60 minutes) per AC nAdministrable alarm strategy per AC nEstablishment/retry/auto restoration order based on administered priority Detailed description Establish an AC between the following: nTwo endpoints on the same switch nTwo endpoints in the same private network, but on different switches nOne endpoint on the controlling switch and another endpoint off the private network In all configurations, administer the AC on the switch having the originating endpoint. For an AC in a private network, if the two endpoints are on two different switches, normally the connection routes via Automatic Alternate Routing (AAR)
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 409 Administered Connection 15 through tie trunks (ISDN, DS1, or analog tie trunks) and intermediate switches. If required, route the connection via Automatic Route Selection (ARS) and Generalized Route Selection (GRS) through the public network. The call routes over associated ISDN trunks. When the far-end answers, a connection occurs between the far-end and the near-end extension in the Originator field on the AC screen. Because the system makes an administered connection automatically, you do not use the following: nData Call Setup Do not assign a default dialing destination to a data module when it is used in an AC. nData Hotline Do not assign a hotline destination to a data module that is used in an AC. nTerminal Dialing Turn off terminal dialing for data modules involved in an AC. This prevents display of call-processing messages (INCOMING CALL,...) on the terminal. Access endpoints Access endpoints are non-signaling trunk ports. They neither generate signaling to the far-end of the trunk nor respond to signaling from the far-end. Designate an access endpoint as the originating endpoint or destination endpoint in an AC. Typical AC applications The following are typical AC applications: nA local data endpoint connection to a local or remote-access endpoint. Examples: an MPDM ACCUNET digital service connecting to SDDN via an ISDN trunk-group DS1 port; an MPDM ACCUNET digital service connecting to an ACCUNET Switched 56 Service via a DS1 port. nA local-access endpoint connecting to a local or remote-access endpoint. Examples: a DSO cross-connect and a 4-wire leased-line modem to a 4-wire modem connection via an analog tie trunk.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 410 Administered Connection 15 nA local data endpoint connecting to a local or remote data endpoint such as a connection between two 3270 data modules. NOTE: The following guidelines do not include AAR and ARS, or GRS administration information for routing AC calls over trunk groups. Refer to the respective feature elsewhere in this book for that information. Establishing Administered Connections The originating switch attempts to establish an AC only if one of the following conditions exist: nAC is active. nAC is due to be active (either a permanent AC or time-of-day requirements are satisfied if it is a scheduled AC). nOriginating endpoint is in in-service or idle state. If the originating endpoint is not in service or is idle, no activity takes place for the AC until the endpoint transitions to the desired state. The originating switch uses the destination address to route the call to the desired endpoint. When the switch establishes two or more ACs at the same time, the switch arranges the connections in order of priority. AC attempts can fail for the following reasons: nResources are unavailable to route to the destination. nA required conversion resource is not available. nAccess is denied by class of restriction (COR), facilities restriction level (FRL), or bearer capability class (BCC). Or, an attempt is made to route voice-band-data over SDDN trunks in the public switch network. nDestination address is incorrect. nDestination endpoint is busy. nOther network or signaling failures occur. In the event of a failure, an error is entered into the error log, which generates an alarm, if it is warranted by your alarming strategy. You can display AC failures via the status-administered connection command.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 411 Administered Connection 15 As long as an AC is due to be active, the originating switch continues to establish an AC unless the attempt fails because of an administrative error (for example, a wrong number) or service-blocking condition (for example, outgoing calls barred). nThe frequency with which failed attempts are retried is determined by the administered retry interval (1 to 60 minutes) for each AC. nRetries are made after the retry interval has elapsed regardless of the restorable attribute of the AC. nACs are retried in priority order. nWhen you change the time of day on the switch, an attempt is made to establish all ACs in the waiting-for-retry state. Dropping Administered Connections An AC remains active until one of the following occurs: nThe AC is changed, disabled, or removed. nThe time-of-day requirements of a scheduled AC are no longer satisfied. nOne of the endpoints drops the connection. This could be because of user action (in the case of a data endpoint), maintenance activity resulting from an endpoint failure, busying out of the endpoint, or handshake failure. If the endpoints are incompatible, the connection is successful until handshake failure occurs. NOTE: An AC between access endpoints remains connected even if the attached access equipment fails to handshake. nAn interruption (for example, facility failure) occurs between the endpoints. If an AC drops because it was disabled/removed or is no longer due to be active, no action is taken. If an AC drops because of changed AC attributes, an immediate attempt is made to establish the connection with the changed attributes if it is still due to be active. Existing entries in the error/alarm log are resolved if they no longer apply. If handshake failure resulted in the dropping of the connection, in the case of an AC involving at least one data endpoint, no action is taken for that AC until the change administered-connection command is executed.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 412 Administered Connection 15 Administered Connections failure: Auto Restoration and Fast Retry When an active AC drops prematurely, you must invoke either auto restoration or fast retry to determine whether auto restoration is attempted for an active AC. If you option AC for auto restoration and the connection was routed over SDDN trunks, auto restoration is attempted. During restoration, connections are maintained between the switch and both endpoints. In addition to allowing the active session to be maintained, AC also provides a high level of security by prohibiting other connections from intervening in active sessions. Auto restoration generally completes before the 60-second endpoint holdover interval. If auto restoration is successful, the call might be maintained (no guarantee). The restoration is transparent to the user with the exception of a temporary disruption of service while restoration is in progress. A successful restoration is reflected by the restored state on the status AC screen. Although the restoration was successful, the data session may not have been preserved. If auto restoration is not active or if the AC is not routed over SDDN trunks, the switch immediately attempts to reestablish the connection (fast retry). The switch also attempts a retry if the originating endpoint initiated the drop. With fast retry, connections are not maintained on both ends. Fast Retry is not attempted for an AC that was last established via fast retry, unless the AC is active for at least two minutes. If auto restoration or fast retry fails to restore or reestablish the connection, the call drops and the AC goes into retry mode. Retry attempts continue, at the administered retry interval, as long as the AC is due to be active. Administering Administered Connections 1. Choose one of the following data modules and administer all fields: nData Line Data Module (use with Data Line circuit pack) nProcessor/Trunk Data Module (use with one of the following:) — MPDMs, 700D, 7400B, 7400D, or 8400B MTDMs, 700B, 700C, 700E, or 7400A nProcessor Interface Data Module (refer to DEFINITY ECS Administration for Network Connectivityfor more information) nX.25 Data Module (refer to DEFINITY ECS Administration for Network Connectivity for more information) n7500 Data Module (use with ISDN Line 12-BRI-S-NT or ISDN Line 12-BRI-U-NT circuit pack) nWorld Class Core BRI Data Module (use with wcbri)
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 413 Administered Connection 15 2. On the DS1 Circuit Pack screen, administer all fields. Refer to ‘‘DS1 Circuit Pack’’ on page 599 for more information. (Use with switch node carriers.) 3. On the Access Endpoint screen, administer all fields. Refer to ‘‘ Access Endpoint’’ on page 467 for more information. 4. Choose one of the following trunk groups and administer all fields. Refer to ‘‘ ISDN trunk group’’ on page 738 and ‘‘Trunk Group’’ on page 967 for more information. nISDN-BRI nISDN-PRI nTie 5. On the Class of Restriction screen, administer all fields. Refer to ‘‘ Class of Restriction’’ on page 520 for more information. 6. On the Class of Service screen, administer all fields. Refer to ‘‘ Class of Service’’ on page 532 for more information. 7. On the Dial Plan Record screen, administer the Local Node Number field with a number from 1-63 that matches the DCS switch node number and the CDR node number. Refer to ‘‘ Dial Plan Record’’ on page 593 for more information. 8. On the Administered Connection screen, administer all fields. Refer to ‘‘ Administered Connection’’ on page 471 for more information. 9. On the Station screen, assign one button as ac-alarm. Refer to ‘‘ Station’’ on page 882 for more information. 10. On the Attendant Console screen, assign one button as ac-alarm. Refer to ‘‘ Attendant Console’’ on page 484 for more information. Interactions nAbbreviated Dialing Use Abbreviated Dialing entries in the Destination field. Entries must comply with restrictions. nBusy Verification of Stations and Trunks This feature does not apply to access endpoints because they are used only for data. nCall Detail Recording For an AC that uses a trunk when CDR is active, the origination extension is the originator of the call.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 414 Administered Connection 15 nClass of Restriction Reserve a COR for AC endpoints and SDDN trunks. This restricts endpoints that are not involved in AC from connecting to SDDN trunks or endpoints involved in AC. nClass of Service/Call Forwarding Assign to an AC endpoint a COS that blocks Call Forwarding activation at the endpoint. nDigital Multiplexed Interface (DMI) Use DMI endpoints as the destination in an AC. DMI endpoints do not have associated extensions, so do not use them as the originator in an AC. nFacility Test Calls The feature does not apply to access endpoints because an access endpoint acts as an endpoint rather than as a trunk. nModem Pooling If you require a modem in an AC, one is inserted automatically. If no modem is available, the connection is dropped. nNon-Facility Associated Signaling (NFAS) and D-Channel Backup Auto restoration for an AC that is initially routed over an NFAS facility may fail if the only backup route is over the facility on which the backup D-channel is administered. The backup D-channel may not come into service in time to handle the restoration attempt. nSet Time Command When you change the system time via the set time command, all scheduled ACs are examined. If the time change causes an active AC to be outside its scheduled period, the AC is dropped. If the time change causes an inactive AC to be within its scheduled period, the switch attempts to establish the AC. If any AC (scheduled or continuous) is in retry mode and the system time changes, the switch attempts to establish the AC. nSystem Measurements Access endpoints are not measured. All other trunks in an AC are measured as usual.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 415 Modem Pooling 15 Modem Pooling Modem Pooling allows switched connections between digital-data endpoints (data modules) and analog-data endpoints via pods of acoustic-coupled modems. The analog-data endpoint is either a trunk or a line circuit. Data transmission between a digital data endpoint and an analog endpoint requires conversion via a modem, because the DCP format used by the data module is not compatible with the modulated signals of an analog modem. A modem translates DCP format into modulated signals and vice versa. Modem Pooling feature provides pools of integrated-conversion modems and combined-conversion modems. Integrated-conversion modem pools have functionality integrated on the Pooled Modem circuit pack, providing two modems. Each one emulates a TDM cabled to a 212 modem. Integrated are modem pools not available in countries that use A-law companding. Combined-conversion modem pools are TDMs cabled to any TDM-compatible modem. Combined-conversion modem pools can be used with all systems. The system can detect the needs for a modem. Data calls from an analog-data endpoint require that the user indicate the need for a modem, because the system considers such calls to be voice calls. Users indicate this need by dialing the data-origination access code field on the Feature Access Code screen before dialing the digital-data endpoint. The system provides a Hold Time parameter to specify the maximum time any modem can be held but not used (while a data call is in queue). Administering Modem Pooling For Integrated modem poolings: 1. On the Modem Pool Group screen, administer all fields. Refer to ‘‘ Modem Pool Group’’ on page 817 for more information. 2. On the Feature Access Code screen, administer the Data Origination Access Code field. Refer to ‘‘ Feature Access Code’’ on page 619 for more information. 3. On the Data Module screen, administer all fields. Refer to ‘‘ Data modules’’ on page 558 for more information.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 416 Modem Pooling 15 For Combined modem poolings: 1. On the Modem Pool Group screen, administer all fields. Refer to ‘‘ Modem Pool Group’’ on page 817 for more information. 2. On the Feature Access Code screen, administer the Data Origination Access Code field. Refer to ‘‘ Feature Access Code’’ on page 619 for more information. Considerations nOn data calls between a data module and an analog-data endpoint, Return-to-Voice releases the modem and returns it to the pool. The telephone user connects to the analog-data endpoint. nFor traffic purposes, the system accumulates data on modem-pooling calls separate from voice calls. Measurements on the pools also accumulate. nModem Pooling is not restricted. Queuing for modems is not provided, although calls queued on a hunt group retain reserved modems. nAvoid mixing modems from different vendors within a combined pool because such modems may differ in transmission characteristics. nEach data call that uses Modem Pooling uses four time slots (not just two). As a result, heavy usage of Modem Pooling could affect TDM bus-blocking characteristics. nTandem switches do not insert a pooled modem. The originating and terminating switches insert a pooled modem. Interactions nCall Detail Recording Data call CDR records the use of modem pools on trunk calls. nData Call Setup Data calls to or from a TDM cannot use Modem Pooling. nData Privacy and Data Restriction The insertion of a modem pool does not turn off Data Privacy or Data Restriction. nData-Only Off-Premises Extensions Calls to or from a Data-Only Off-Premises Extension cannot use Modem Pooling, when this type of digital-data endpoint uses a TDM.