Lucent Technologies DEFINITY Enterprise Communication Server Release 8.2 Administrators Guide

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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. 
						

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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 
						

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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 
						

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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. 
						

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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. 
						

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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 
						

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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 
						

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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. 
						

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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. 
						

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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.