Lucent Technologies 8.2 Benutzerhandbuch
DEFINITY ECS Release 8.2
Administrator’s Guide
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1588
Wideband Switching
20
Channel allocation
For standard narrowband communication, ISDN-PRI divides a T1 or E1 trunk as
follows:
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
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.
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.)
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.
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.
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