Avaya Communication Manager Administrator's Manual page 468

Managing Data Calls
Wideband Switching
To reduce glare probability, the network needs to be administered so both sides of the interface select
channels from opposite ends of facilities. This is called linear hunting, ascending or descending. 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.
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 which 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, Communication Manager 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 to minimize
blocking 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.
Channel Type
H0
H11
H12
Flexible NxDS0
Floating NxDS0
Administering Wideband Switching
Before you start
You need a DS1 Converter circuit pack. See the Avaya System Description Pocket Reference for more
information on the circuit pack.
Instructions
To administer wideband switching:
1
On the Access Endpoint screen, administer all fields.
See Access Endpoint
2
On the PRI Endpoint screen, administer all fields.
See PRI Endpoint
3
On the ISDN Trunk Group screen, administer all fields.
See Trk Grp(s)
468
Blocking Minimization Strategy
Preserve idle quadrants
Preserve idle facilities
Preserve idle facilities
Preserve idle facilities
Preserve idle facilities as first priority
on page 619 for more information.
on page 1109 for more information.
on page 962 for more information.
Administrator's Guide for Avaya Communication Manager
November 2003