Lucent Technologies DEFINITY Enterprise Communication Server Release 8.2 Administrators Guide

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1597 Wideband Switching 
20
There are additional factors to note regarding specific values of N and the 
NxDS0 service:
— N = 1 — this is considered a narrowband call and is treated as any 
other voice or narrowband-data (B-channel) call.
— N = 6 — if a trunk group is optioned for both H0 and N x DS0 
service, a 384-kbps call offered to that trunk group is treated as an 
H0 call and the H0 constraints apply. If the H0 constraints cannot be 
met, then the call is blocked.
— N = 24 — if a trunk group is optioned for both H11 and N x DS0 
service, a 384-kbps call offered to that trunk group is treated as an 
H0 call and the H0 constraints apply. If the H0 constraints cannot be 
met, then the call is blocked.
— N = 24 — if a trunk group is optioned for both H11 and N x DS0 
service, a 1,536-kbps call offered to that trunk group is treated as an 
H11 call and the H11 trunk allocation constraints apply.
— N = 30 — if a trunk group is optioned for both H12 and N x DS0 
service, a 1,920-kbps call offered to that trunk group is treated as an 
H12 call and the H12 trunk allocation constraints apply.
Glare prevention
Glare occurs when both sides of an ISDN interface select the same B-channel for 
call initiation. For example, a user side of an interface selects the B-channel for an 
outgoing call and, before the switch receives and processes the SETUP message, 
the switch selects the same B-channel for call origination. Since wideband calls 
use more channels, the chances of glare are greater. Glare conditions can be 
limited with proper channel administration, but they may never be eliminated and 
some calls may still be dropped.
Some glare situations might not be resolvable. In one case, the network and the 
user side may send SETUP messages simultaneously or nearly simultaneously. 
Another glare scenario can occur in the brief window after the SETUP message 
has been sent but before the first response is received from the switch at the other 
side of the interface. If an incoming SETUP arrive during this window, the 
incoming SETUP message is allowed to proceed and the outgoing call is dropped. 
Various glare situations and their resolution are described in the following table.
DEFINITY ECS does not negotiate channels for wideband calls. 
						

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1598 Wideband Switching 
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GLARE RESOLUTION
Outgoing 
Call TypeIncoming 
Call TypeSwitch-Supporting
User ProtocolSwitch-Supporting 
Network Protocol
B-channel B-channel No negotiation
Incoming call (from 
network) winsNegotiation is attempted
Incoming call (from user) 
dropped if negotiation is 
unsuccessful
Outgoing call (to network) 
retried on another trunkOutgoing call (to user) stays 
up
B-channel(s) Wide No negotiation No negotiation
Incoming call (from 
network) droppedIncoming call (from user) 
dropped
Outgoing calls (to network) 
stay up but likely are 
dropped by network 
because channels are in use, 
although there is a 
possibility some switches 
might negotiate these calls.Outgoing calls (to user) stay 
up and possibly stay up if 
other side lets the network 
call win.
Wide B-channel(s) No negotiation Negotiation is attempted
Incoming call (from 
network) winsIncoming call (from user) 
dropped if negotiation is 
unsuccessful
Outgoing call (to network) 
retried on another trunkOutgoing call (to user) stays 
up
Wide Wide No negotiation No negotiation
Incoming call (from 
network) droppedIncoming call (from user) 
dropped
Outgoing call (to network) 
stays up but likely are 
dropped by network 
because channels are in use.Outgoing call (to user) stays 
up and may not be dropped 
by other side because other 
side, if it is not a DEFINITY 
ECS, may let the network 
call win.
Continued on next page 
						

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1599 Wideband Switching 
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To reduce glare probability, the network needs to be administered so both sides of 
the interface select channels from opposite ends of facilities. For example, on a 
23B+D trunk group, the user side could be administered to select B-channels 
starting at channel 23 while the network side would be administered to start 
selecting at channel 1. Using the same example, if channel 22 is active but channel 
23 is idle, the user side should select channel 23 for re-use. This is known as linear 
trunk hunt and is the hunt option used by DEFINITY ECS for wideband.
Blocking prevention
Blocking occurs when insufficient B-channels required to make a call are 
available. Narrowband calls require only one channel so blocking is less likely 
than with wideband calls that require multiple B-channels. Blocking also occurs 
for wideband calls when bandwidth is not available in the appropriate format (that 
is, fixed, floating, or flexible).
To reduce blocking, the switch selects trunks for both wideband and narrowband 
calls to maximize availability of idle fixed channels for H0, H11, and H12 calls 
and idle floating channels for N x DS0 calls that require a contiguous bandwidth. 
The strategy for preserving idle channels depends on the channel type. The 
chances for blocking are reduced if you use a flexible algorithm, assuming it is 
supported on the other end.
Considerations
nFor example, if the user side is provisioned to start at the high side (DS0 
23) and DS0 22 is idle but DS0 23 is active, reselect DS0 22 for the next 
call. This is known as linear trunk hunting. Only the direction of hunt is 
administrable. 
Channel Type Blocking Minimization Strategy
H0 Preserve idle quadrants
H11 Preserve idle facilities
H12 Preserve idle facilities
Flexible NxDS0 Preserve idle facilities
Floating NxDS0 Preserve idle facilities as first priority 
						

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1600 Wideband Switching 
20
Interactions 
nAdministered Connections
Provides call initiation for WAEs. All Administered Connections that 
originate from WAEs use the entire bandwidth administered for WAE. The 
destination of an Administered Connection can be a PRI endpoint.
nAutomatic Circuit Assurance 
Treats wideband calls as single-trunk calls so that a single ACA-referral 
call is made if an ACA-referral call is required. The call is on the lowest 
B-channel associated with the wideband call.
nCall Coverage
A wideband endpoint extension cannot be administered as a coverage point 
in a call-coverage path.
nCall Detail Recording 
When CDR is active for the trunk group, all wideband calls generate CDR 
records. The feature flag indicates a data call and CDR records contain 
bandwidth and Bearer Capability Class (BCC). 
nCall Forwarding
You must block Call Forwarding through Class of Service.
nCall Management System and Basic Call Management System
Wideband calls can be carried over trunks that are measured by CMS and 
BCMS. Wideband endpoints are not measured by CMS and BCMS.
nCall Vectoring
PRI endpoints use a vector-directory number when dialing. For example, 
PRI endpoint 1001 dials VDN 500. VDN 500 points to Vector 1. Vector 1 
can point to other PRI endpoints such as route-to 1002, or route-to 1003, or 
busy.
Call Vectoring is used by certain applications. When an incoming 
wideband call hunts for an available wideband endpoint, the call can route 
to a VDN, that sends the call to the first available PRI endpoint. 
nClass of Restriction
COR identifies caller and called-party privileges for PRI endpoints. 
Administer the COR so that account codes are not required. Forced entry of 
account codes is turned off for wideband endpoints. 
nClass of Service
COS determines the class of features that a wideband endpoint can activate.  
						

							DEFINITY ECS Release 8.2
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Features and technical reference 
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nFacility and Non-Facility Associated Signaling
FAS and NFAS with or without D-Channel Backup requires administration 
via signaling groups for trunk-side wideband interfaces.
nFacility Busy Indication
You can administer a busy-indicator button for a wideband-endpoint 
extension, but the button does not accurately track endpoint status.
nFacility Test Calls
Use Facility Test Calls to perform loop-back testing of the wideband call 
facility.
nGeneralized Route Selection
GRS supports wideband BCC to identify wideband calls. GRS searches a 
route pattern for a preference that has wideband BCC. Route preferences 
that support wideband BCC also support other BCCs to allow different call 
types to share the same trunk group.
nCO Trunk (TTC - Japan) Circuit Pack
The CO Trunk (TTC - Japan) circuit pack cannot perform wideband 
switching. No member of the circuit pack should be a member of a 
wideband group.
World-Class Tone Detection and 
Generation
World-Class Tone Detection allows DEFINITY ECS to identify and handle 
different types of call-progress tones. The tone detector and identification is used 
to display on Data Terminal Dialing and for deciding when to send digits on trunk 
calls through Abbreviated Dialing, ARS, AAR, and Data Terminal Dialing.
World-Class Tone Generation allows you to define call-progress tones. You can 
select values for frequency and cadence. If you do not define a call-progress tone, 
DEFINITY ECS sends silence. Brief call-waiting tones are optimal because, 
while a tone is sounding, speech cannot be heard.
A Lucent representative must administer tone detection and tone generation when 
establishing country-specific system parameters. 
						

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1602 World-Class Tone Detection and Generation 
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Interactions
nData Modules
Multiline Data Terminal Dialing is disabled if the Multiple-line Level of 
Tone Detection field is 
medium or broadband. It is enabled if the Level of 
Tone Detection field is 
precise. 
						

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1603 World-Class Tone Detection and Generation 
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							References 
1604 Basic DEFINITY ECS documents 
21
DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
21
References
This chapter contains a list of user documents for the DEFINITY Enterprise 
Communications Server (ECS) Release 8.2. Most of these documents are 
backward compatible with DEFINITY ECS Release 7 systems.
To order these or other DEFINITY documents, contact the Lucent Technologies 
Publications Center at the address and phone number on the back of the title page 
of this document. A complete catalog of Business Communications Systems 
(BCS) documents is available on the World Wide Web: 
http://www.lucent.com/enterprise/documentation
Basic DEFINITY ECS documents
These documents are issued for all new and upgrade DEFINITY ECS Release 8.2 
systems.
Administration
The primary audience for these documents consists of customer administrators.
DEFINITY ECS Release 8.2 — Administrator’s Guide, 555-233-506, Issue 1
A task-based document that provides step-by-step procedures for administering 
the switch. This book contains information previously found in DEFINITY ECS 
Administration and Feature Description, 555-230-522, and DEFINITY ECS 
Release 8 — Administrator’s Guide, 555-233-502, as well as new information for 
this release. 
						

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
References 
1605 Basic DEFINITY ECS documents 
21
DEFINITY ECS Release 8.2 — Administration for Network Connectivity, 
555-233-504, Issue 1
Describes how to administer connections between DEFINITY ECS switches (csi, 
si, and r models) for DCS messaging. The main focus is on TCP/IP connectivity 
introduced with DEFINITY Releases 7 and 8, including voice over IP (VOIP).
DEFINITY ECS Release 8.2 — Change Description, 555-233-411, Issue 1
Provides a high-level overview of what is new in DEFINITY ECS R8.2. Describes 
the hardware and software enhancements and lists the problem corrections for this 
release. It also includes any last-minute changes that come in after the remaining 
books have gone to production.
DEFINITY ECS Release 8.2 — System Description, 555-233-200, Issue 1
Provides hardware descriptions, system parameters, listing of hardware required 
to use features, system configurations, and environmental requirements.
DEFINITY System’s Little Instruction Book for basic administration, 
555-233-756, Issue 1
Provides step-by-step procedures for performing basic switch administration 
tasks. Includes managing phones, managing features, routing outgoing calls, and 
enhancing system security.
DEFINITY System’s Little Instruction Book for advanced administration, 
555-233-757, Issue 1
Provides step-by-step procedures for managing trunks, managing hunt groups, 
setting up night service, writing vectors, recording announcements, using reports, 
and understanding call centers.
DEFINITY System’s Little Instruction Book for basic diagnostics, 
555-233-758, Issue 1
Provides step-by-step procedures for baselining your system, solving common 
problems, reading alarms and errors, using features to troubleshoot your system, 
and contacting Lucent. 
						

							DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
References 
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DEFINITY ECS Release 8.2 — Reports, 555-233-505, Issue 1
Provides detailed descriptions of the measurement, status, security, and recent 
change history reports available in the system and is intended for administrators 
who validate traffic reports and evaluation system performance. Includes 
corrective actions for potential problems. Previously known as DEFINITY ECS 
System Monitoring and Reporting.
BCS Products Security Handbook, 555-025-600, Issue 7
Provides information about the risks of telecommunications fraud and measures 
for addressing those risks and preventing unauthorized use of BCS products. This 
document is intended for telecommunications managers, console operators, and 
security organizations within companies.
DEFINITY Terminals and Adjuncts Reference, 555-015-201, Issue 10
Provides drawings and full descriptions for all phones, phone adjuncts, and data 
terminals that can be used with System 75, System 85, DEFINITY 
Communications System, and DEFINITY ECS. This document is intended for 
customers and Lucent Technologies account teams for selecting the correct 
equipment.
Guide Builder™ Software for DEFINITY® Telephones, 555-230-755, Issue 5
Provides the ability to produce laser-printed documentation for specific 
telephones. A comprehensive user’s guide and on-line help support the software. 
This information applies to Release 8.2 as well as earlier DEFINITY systems. All 
customers receive this software.
Installation and maintenance
DEFINITY ECS Release 8.2 — Installation and Test for Single-Carrier 
Cabinets, 555-233-120, Issue 1
Provides procedures and information for hardware installation and initial testing 
of single-carrier cabinets. This document is availabe in languages other than 
English and can be ordered from the BCS Publications Catalog web site.
DEFINITY ECS Release 8.2 — Installation and Test for Multi-Carrier 
Cabinets, 555-233-114, Issue 1
Provides procedures and information for hardware installation and initial testing 
of multi-carrier cabinets.