Channel Allocation; Typical Uses - Avaya Communication Manager Administrator's Manual

The following table provides information on Wideband Switching channel types.
Channel Type
H0 (T1 or E1)
H11 (T1 or E1)
H12 (E1 only)
NxDS0 (T1)
NxDS0 (E1)

Channel allocation

For standard narrowband communication, ISDN-PRI divides a T1 or E1 trunk as follows:
T1 trunks are divided into 23 information channels are 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.
Performed using one of the 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 non-contiguous positions within a
●
single T1 or E1 facility (NxDS0).
Floating allocation — Enforces contiguous-channel aggregation. The starting channel is
●
not constrained to a predetermined starting point (NxDS0).

Typical uses

A typical video application uses an ISDN-PRI interface to DS0 1 through 6 of the line-side
facility. See Figure
Number of Channels (DSOs)
6 (grouped 4 (T1) or 5 (E1) quadrants
of 6 B-channels each)
24 (on T1 - all 24 B-channels, with the
D-channel not used; on E1 -
B-channels 1 to 15, and 17 to 25, and
B-channels 26 to 31 unused)
30 (B-channels 1 to 15 and 17 to 31)
2-24
2-31
202.
Wideband Switching
Data Rate
384 Kbps
1536 Kbps
1920 Kbps
128 to 1536 Kbps
128 to 1984 Kbps
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