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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 417 PC Interface 15 nDMI Trunks If you place a data call from a local analog-data endpoint to a DMI trunk, you must dial the data-origination access code to obtain a modem. Data calls on DMI trunks to local analog-data endpoints automatically obtain modems. nDS1 Tie Trunk Service Connect modems used for Modem Pooling to AVD DS1 tie trunks via Data Terminal Dialing or by dialing the feature-access code for data origination. PC Interface The personal computer (PC) Interface consists of the PC/PBX platforms and PC/ISDN Platform product family. These products are used with DEFINITY ECS to provide users of IBM-compatible PCs fully-integrated voice and data workstation capabilities. Two groups of different configurations are available for PC Interface: group 1 uses Digital Communications Protocol (DCP) and group 2 uses the ISDN-BRI (Basic Rate Interface) protocol. The group 1 configurations consist of DCP configurations that use a DCP expansion card) in the PC to link to the switch. Group 1 (shown in Figure 12) uses the following connections: nThe PC Interface card plugs into an expansion slot on the PC. The card has 2 standard 8-pin modular jacks (line and phone). nThe digital phone plugs into the phone jack on the PC Interface card. nThe line jack on the card provides a digital port connection to DEFINITY ECS. nThe distance between the PC Interface card and the PBX should be no more than 1524m for 24-gauge wire or 1219m for 26-gauge wire.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 418 PC Interface 15 Figure 12. DCP PC interface configuration (Group 1) The group 2 configurations link to the switch using a PC/ISDN Interface card installed in the PC. This group can include a stand-alone PC terminal, or up to 4 telephones, handsets, or headsets. Group 2 (shown in Figure 13 ) uses PC/ISDN Interface cards (up to four cards) which plug into expansion slots on the PC. These cards each provide 2 standard 8-pin modular-jack connections for both line connections (to the switch) and phone connections. A standard 4-pin modular jack is also available for use with a handset or headset. Figure Notes 1. IBM-compatible PC with DCP Interface card 2. IBM-compatible PC with DCP Interface card 3. DCP4. DCP telephone 5. DEFINITY ECS (Digital Line, Digital Line (16-DCP-2-Wire), or Digital Line (24-DCP-2-wire) circuit pack) 6. Host
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 419 PC Interface 15 Figure 13. ISDN—BRI PC interface configuration (Group 2) PC Interface users have multiple appearances (depending on the software application used) for their assigned extension. Designate one or more of these appearances for use with data calls. With the ISDN-BRI version, you can use up to 4 separate PC/ISDN Interface cards on the same PC. Assign each card a separate extension, and assign each extension one or more appearances. The availability of specific features depends on the COS of the extension and the COS for the switch. Modem Pooling is provided to ensure general availability of off-net data-calling services. Figure Notes 1. ISDN telephone 2. PC with application 3. Handset or Headset 4. BRI Interface card 5. 2B + D 6. ISDN Line (12-BRI-S-NT) circuit pack)7. DEFINITY ECS 8. PRI trunks 9. BRI stations 10. Interworking 11. DMI 12. Switch features
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 420 PC Interface 15 Security There are two areas where unauthorized use may occur with this feature: unauthorized local use and remote access. !SECURITY ALERT: Unauthorized local use involves unauthorized users who attempt to make calls from a PC. The PC software has a security setting so users can place the PC in Security Mode when it is unattended. You also can assign Automatic Security so that the administration program on the PC is always active and runs in Security Mode. This mode is password-protected. !SECURITY ALERT: Remote access involves remote access to the PC over a data extension. Remote users can delete or copy PC files with this feature. You can password-protect this feature. Refer to the BCS Products Security Handbook for additional steps to secure your system and to find out about obtaining information regularly about security developments. Administering a PC interface 1. On the Station screen, set the Type field to pc. Considerations nUse the Function Key Module of the 7405D with PC Interface. nBRI terminals normally are initializing terminals and require you to assign an SPID. The PC/ISDN Platform (Group 2), in a stand-alone configuration, is a non-initializing BRI terminal and does not require you to assign a SPID. — Set a locally-defined terminal type with General Terminal Administration — Define the terminal type as a non-initializing terminal that does not support Management Information Messages (MIM). — Assign the PC/ISDN Platform with an associated (initializing) ISDN-BRI telephone (such as an ISDN 7505) using a SPID. — Assign the station (using a locally-defined terminal type) to take full advantage of the capabilities of the PC Interface. This terminal type is also non-initializing with no support of MIMs.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 421 Wideband Switching 15 nDo not use telephones with data modules with the PC Interface. (You can still use 3270 Data Modules if you also use 3270 emulation). If you attach a DCP data module or ISDN data module to a telephone that is connected to a PC Interface card, the data module is bypassed (not used). All the interface functions are performed by the interface card even if a data module is present. nThe 7404D telephone with messaging cartridge cannot be used with PC Interface. However, the 7404D with PC cartridge can be used, but only with Group 1 configurations. Wideband Switching Wideband Switching provides the ability to dedicate 2 or more ISDN-PRI B-channels or DS0 endpoints for applications that require large bandwidth. It provides high-speed end-to-end communication between endpoints where dedicated facilities are not economic or appropriate. ISDN-BRI trunks do not support wideband switching. Wideband Switching supports: nHigh-speed video conferencing nWAN disaster recovery nScheduled batch processing (for example, nightly file transfers) nLAN interconnections and imaging nOther applications involving high-speed data transmission, video transmission, or high bandwidth Detailed description ISDN-PRI divides a T1 or E1 trunk into 24 (32 for E1) channels, where one channel is used for signaling, and all others for standard narrowband communication. Certain applications, like video conferencing, require greater bandwidth. You can combine several narrowband channels into one wideband channel to accommodate the extra bandwidth requirement. DEFINITY ECS serves as a gateway to many types of high-bandwidth traffic. In addition, DS1 Converter circuit packs are used for wideband switching at DS1 remote EPN locations. They are compatible with both a 24-channel T1 and 32-channel E1 facility (transmission equipment). They support circuit-switched wideband connections (NxDS0) and a 192 Kbps packet channel.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 422 Wideband Switching 15 The following table provides information on Wideband Switching channel types. Channel allocation For standard narrowband communication, ISDN-PRI divides a T1 or E1 trunk as follows: nT1 trunks are divided into 23 information channels are 1 signaling channel nE1 trunks are divided into 30 information channels, 1 signaling channel, and 1 framing channel Certain applications, like video conferencing, require greater bandwidth. You can combine several narrowband channels into one wideband channel to accommodate the extra bandwidth requirement. DEFINITY ECS serves as a gateway to many types of high-bandwidth traffic. In addition, DS1 converters are used for wideband switching at remote locations. Performed using one of the three allocation algorithms: fixed, flexible, or floating. nFixed allocation — Provides contiguous-channel aggregation. The starting channel is constrained to a predetermined starting point. (Used only for H0, H11, and H12 calls.) nFlexible allocation — Allows a wideband call to occupy non-contiguous positions within a single T1 or E1 facility (NxDS0). nFloating allocation — Enforces contiguous-channel aggregation. The starting channel is not constrained to a predetermined starting point (NxDS0). Channel Type Number of Channels (DSOs) Data Rate H0 (T1 or E1) 6 (grouped 4 (T1) or 5 (E1) quadrants of 6 B-channels each)384 Kbps H11 (T1 or E1) 24 (on T1 - all 24 B-channels, with the D-channel not used; on E1 - B-channels 1 to 15, and 17 to 25, and B-channels 26 to 31 unused)1536 Kbps H12 (E1 only) 30 (B-channels 1 to 15 and 17 to 31) 1920 Kbps NxDS0 (T1) 2-24 128–1536 Kbps NxDS0 (E1) 2-31 128–1984 Kbps
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 423 Wideband Switching 15 Typical uses A typical video application uses an ISDN-PRI interface to DS0 1 through 6 of the line-side facility. Refer to Figure 14 . Figure Notes Figure 14. Wideband Switching Video Application 1. Video application 2. Port 1 3. Port 2 4. ISDN terminal adaptor 5. Line-side ISDN-PRI 6. DEFINITY ECS 7. ISDN trunk8. Network 9. DS0 24 D-channel 10. DS0 23 unused 11.DS0 1–6 wideband 12. DS0 24 D-channel 13. DS0 7–23 narrow bands 14. DS0 1–6 wideband wdbndex CJL 061996
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 424 Wideband Switching 15 Endpoint applications An endpoint application is the origination or destination of a wideband call. Endpoint application can be any number of data applications based on the customer’s particular needs. ISDN-PRI terminal adapters For wideband switching with non-ISDN-PRI equipment, you can use an ISDN-PRI terminal adapter. ISDN-PRI terminal adapters translate standard ISDN signaling into a form that can be used by the endpoint application and vice versa. The terminal adapter also must adhere to the PRI-endpoint boundaries as administered on the DEFINITY ECS switch when handling both incoming (to the endpoint) applications and outgoing calls. Line-side (T1 or E1) ISDN-PRI facility A line-side ISDN-PRI (T1 or E1) facility is comprised of a group of DS0s (24 for a T1 facility and 32 for an E1 facility). In this context, these DS0s are also called channels. T1 facilities have 23 B-channels and a single D-channel. E1 facilities have 30 B-channels, 1 D-channel, and a framing channel. Data flows bi-directionally across the facility between the switch and the ISDN-PRI terminal adapter. PRI-endpoints A PRI-endpoint (PE) is a combination of DS0 B-channels on a line-side ISDN-PRI facility that has been assigned an extension. A PRI-endpoint can support calls of lower bandwidth. In other words, a PE having a width 6 (six DS0s) can handle a call of one channel (64 Kbps) up to an including 6 channels. For example, an endpoint application connected to a PE defined as using B-channels 1 through 6 of an ISDN-PRI facility could originate a call using B-channels 1, 3, and 5 successfully. If the PE has been administered to use flexible channel allocation, the algorithm for offering a call to the PE starts from the first DS0 administered to the PE. Since only one active call is permitted on a PE, contiguous B-channels always are selected unless one or more B-channels are not in service. One facility can support multiple separate and distinct PRI-endpoints (several extensions) within a single facility. Non-overlapping contiguous sets of DS0s (B-channels) are associated with each PE. Universal digital signaling level 1 circuit pack The UDS1 circuit pack is the interface for line-side and network facilities carrying wideband calls.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 425 Wideband Switching 15 Non-signaling configuration Wideband also can support configurations using non-signaling (non-ISDN-PRI) line-side T1 or E1 connections. The endpoints are the same as those defined for configurations with signaling. Data service unit/channel service unit This unit simply passes the call to the endpoint application. Unlike terminal adapters, the DSU/CSU does not have signaling capability. NOTE: No DSU/CSU is needed if the endpoint application has a fractional T1 interface. Line-side (T1 or E1) facility This facility, like the ISDN-PRI facility, is composed of a group of DS0s (24 for a T1 facility and 32 for an E1 facility; both T1 and E1 use 2 channels for signaling purposes). Line-side facilities are controlled solely from the switch. Through the access-endpoint command, a specific DS0 or group of DS0s is assigned an extension. This individual DS0 or group, along with the extension, is known as a Wideband Access Endpoint (WAE). Wideband access endpoint WAEs have no signaling interface to the switch. These endpoints simply transmit and receive wideband data when the connection is active. NOTE: The switch can determine if the connection is active, but this does not necessarily mean that data is actually coming across the connection. A WAE is treated as a single endpoint and can support only one call. If all DS0s comprising a wideband access endpoint are in service, then the wideband access endpoint is considered in service. Otherwise, the wideband access endpoint is considered out of service. If an in-service wideband access endpoint has no active calls on its DS0s, it is considered idle. Otherwise, the wideband access endpoint is considered busy. Multiple WAEs are separate and distinct within the facility and endpoint applications must be administered to send and receive the correct data rate over the correct DS0s. An incoming call at the incorrect data rate is blocked.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Managing data calls 426 Wideband Switching 15 Guidelines and examples This section examines wideband and its components in relation to the following specific customer usage scenarios: nData backup connection nScheduled batch processing nPrimary data connectivity nNetworking Data backup connection Using wideband for data transmission backup provides customers with alternate transmission paths for critical data in the event of primary transmission path failure. Scheduled batch processing Scheduled batch processing applications are used for periodic database updates (for example, retail inventory) or distributions (for example, airline fare schedules). These updates are primarily done after business hours and are often referred to as nightly file transfers. Wideband meets the high bandwidth requirements at low cost for scheduled batch processing. In addition, wideband allows the dedicated-access bandwidth for busy-hour switch traffic to be used for these applications after business hours; no additional bandwidth costs are incurred. The non-ISDN backup data connection is also appropriate for scheduled batch processing applications. Administered Connections are used to schedule daily or weekly sessions originating from this application. Primary data connectivity Permanent data connections (those always active during business hours), such as interconnections between LANs, are well suited for DEFINITY ECS when ISDN-PRI endpoints are used. The ISDN end-to-end monitoring and the endpoint’s ability to react to failures provide for critical data availability needs. With ISDN, endpoints can detect network failures and initiate backup connections through the switch; ISDN endpoints can also establish additional calls when extra bandwidth is needed. Any failures not automatically restored by DEFINITY ECS are signaled to the endpoint application, which can initiate backup data connections over the same PRI endpoint. DEFINITY ECS routes the backup data connections over alternate facilities if necessary.