Lucent Technologies DEFINITY Enterprise Communications Server Release 8.2 Instructions Manual

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1.1
June 2000
Features and technical reference 
1607 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...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1.1
June 2000
Features and technical reference 
1608 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 1.1
June 2000
Features and technical reference 
1609 Wideband Switching 
20
H0
When a trunk group is administered to support H0, the algorithm to satisfy a call 
requiring 384 Kbps of bandwidth also uses a fixed allocation scheme. Unlike the 
H11 fixed scheme which only supports a single fixed starting point, the H0 fixed 
scheme supports four (T1) or five (E1) fixed starting points. The H0 algorithm 
searches for an available quadrant...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1.1
June 2000
Features and technical reference 
1610 Wideband Switching 
20
Regardless of the allocation scheme employed, the N x DS0 algorithm, like 
the H11 and H12 algorithms, attempts to preserve idle facilities when 
offered B, H0, and N x DS0 calls. This is important so that N x DS0 calls, 
for large values of N, have a better chance of being satisfied by a given 
trunk group. However, if one of these calls cannot be satisfied by a...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1.1
June 2000
Features and technical reference 
1611 Wideband Switching 
20
DEFINITY ECS does not negotiate channels for wideband calls.
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...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1.1
June 2000
Features and technical reference 
1612 Wideband Switching 
20
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...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1.1
June 2000
Features and technical reference 
1613 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...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1.1
June 2000
Features and technical reference 
1614 World-Class Tone Detection and Generation 
20
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....

References 
1615 Basic DEFINITY ECS documents 
21
DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1.1
June 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...

DEFINITY ECS Release 8.2
Administrator’s Guide  555-233-506  Issue 1.1
June 2000
References 
1616 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,...