Lucent Technologies 8.2 User Manual

Issue 1

April 2000

Features and technical reference 

1588

Wideband Switching 

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.

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