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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1588Wideband Switching
20
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. DEFINITY ECS 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.
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.
Channel Type Number of Channels Data Rate
H0 6 384 Kbps
H11 24 1536 Kbps
H12 30 1920 Kbps
NXDS0 (T1) 2-24 128–1536 Kbps
NXDS0 (E1) 2-31 128–1984 Kbps