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 
1587 Wideband Switching 
20
Wideband Switching
(Not available with Offer B) 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 connectivity between 
endpoints where dedicated facilities are not economic or appropriate. ISDN-BRI 
trunks do not support wideband...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1588 Wideband Switching 
20
Channel allocation
For standard narrowband communication, ISDN-PRI divides a T1 or E1 trunk as 
follows:
nT1 trunks are divided into 23 information channels and 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...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1589 Wideband Switching 
20
Typical uses
A typical video application uses an ISDN-PRI interface to DS0 1 through 6 of the 
line-side facility. Refer to the following figure.
Figure Notes
Endpoint applications with signaling
An endpoint application is the origination or destination point of a wideband call. 
Endpoint applications can be any number of data applications based on the 
customer’s...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1590 Wideband Switching 
20
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.
The terminal adapter passes calls to and receives calls from the line-side 
ISDN-SETUP messages indicating the data rate and specific B-channels (DS0) to 
be used and...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1591 Wideband Switching 
20
Universal digital signal level 1 board
The UDS1 board is the interface for line-side and network facilities carrying 
wideband calls.
Non-signaling endpoint applications
Wideband can also support configurations using non-signaling (non-ISDN-PRI) 
line-side T1 or E1 facilities. The endpoint applications are the same as those 
defined for configurations with...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1592 Wideband Switching 
20
Guidelines and examples
This section examines wideband and its components in relation to the following 
specific customer usage scenarios:
nHigh-speed video conferencing 
nData backup connection
nScheduled batch processing
nPrimary data connectivity
nNetworking
High-speed video conferencing
All data rates are multiples of 64 Kbps; from 128 Kbps to 1,536 Kbps (T1)...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1593 Wideband Switching 
20
Primary data connectivity. Permanent data connections (those always active 
during business hours), such as interconnections between local area networks 
(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,...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1594 Wideband Switching 
20
Given this facility list concept, the algorithms have the ability to search for trunks, 
by facility, in an attempt to satisfy the bandwidth requirements of a given 
wideband call. If one facility does not have enough available bandwidth to support 
a given call, or it is not used for a given call due to the constraints presented in the 
following section, then the...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1595 Wideband Switching 
20
If the algorithm cannot find an available facility within the trunk group that meets 
these constraints, then the call is blocked from using this trunk group. In this case, 
the call may be routed to a different trunk group preference via Generalized Route 
Selection (GRS), at which time, based on the wideband options administered on 
that trunk group, the call...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1
April 2000
Features and technical reference 
1596 Wideband Switching 
20
scheme supports four (T1) or five (E1) fixed starting points. The H0 algorithm 
searches for an available quadrant within a facility based on the direction of trunk 
or hunt administered. If the algorithm cannot find an available quadrant within any 
facility allocated to this trunk group, then the call is blocked from using this trunk 
group. Again, based on GRS...