Avaya Communication Manager Administrator's Manual page 1765

Channel allocation
For standard narrowband communication, ISDN-PRI divides a T1 or E1 trunk as follows:
•
T1 trunks are divided into 23 information channels and 1 signaling channel
•
E1 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.
Avaya Communication Manager serves as a gateway to many types of high-bandwidth traffic. In
addition, DS1 converters are used for wideband switching at remote locations.
The following table provides information on Wideband Switching channel types.
Channel Type
H0
H11
H12
NXDS0 (T1)
NXDS0 (E1)
Perform wideband line-side channel allocation using one of three allocation algorithms: fixed, flexible, or
floating.
•
Fixed allocation — Provides contiguous-channel aggregation. The starting channel is constrained
to a predetermined starting point. (Used only for H0, H11, and H12 calls.)
•
Flexible allocation — Allows a wideband call to occupy noncontiguous positions within a single
T1 or E1 facility.
•
Floating allocation — Enforces contiguous-channel aggregation. The starting channel is not
constrained to a predetermined starting point.
Typical uses
A typical video application uses an ISDN-PRI interface to DS0 1 through 6 of the line-side facility. See
the following figure.
Administrator's Guide for Avaya Communication Manager
November 2003
Number of Channels
6
24
30
2-24
2-31
Feature Reference
Wideband Switching
Data Rate
384 Kbps
1536 Kbps
1920 Kbps
128–1536 Kbps
128–1984 Kbps
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