Lucent Technologies 7820-0802-003 manual Adsl overview, Introduction to DSL technologies

Configuring DSL Connections (DSLTNT)

Introduction to DSL technologies

The IDSL line card provides the following features:

•ISDN BRI (2B1Q) signaling

•Two DB37 connectors, each providing 16 IDSL sessions for a total of 32 sessions

•128Kbps user bit rate over a two-wire subscriber loop

•Line Termination (LT) mode

•No switch required

•Point-to-point connectivity

•Support for both switched channels and nailed channels (including Lucent’s SuperDigital 128)

•Support for maintenance functions including BRI-U interface monitoring commands, loopback, and out-of-band management

IDSL supports many of the same configuration options as other types of connections, such as nailed and switched sessions, PPP, MP and MPP encapsulation, and incoming and outgoing voice calls.

ADSL overview

Asymmetric Digital Subscriber Line (ADSL) supports high-bandwidth applications such as remote access, Internet or intranet access, and telecommuting. The DSLTNT supports both Carrierless Amplitude Modulation (CAP) and Discrete Multitone (DMT) standards. Both standards support rate adaption, which enables the DSLTNT to detect the noise level on the line and automatically adjust the data transfer rate for optimum performance.

The DSLTNT ADSL cards also support the MultiDSL voice splitter. The voice splitter solution works in conjunction with Lucent DSLPipe™ products to integrate Plain Old Telephone Service (POTS) with ADSL data.

The ADSL-CAP card supports the following asymmetric transfer rates:

Upstream rate	Downstream rate	Distance
544 Kbps	640 Kbps	17,000 feet (5.18 km)
1.088 Mbps	2.560 Mbps	12,000 feet (3.66 km)
1.088 Mbps	7.168 Mbps	10,000 feet (3.05 km)

The ADSL-DMT card supports the following maximum asymmetric transfer rates:

Wire gauge	Upstream rate	Downstream rate	Distance
(AWG)
24	704 Kbps	3040 Kbps	17,000 feet (5.18 km)
26	192 Kbps	512 Kbps	17,000 feet (5.18 km)
24	896 Kbps	7584 Kbps	12,000 feet (3.66 km)
26	640 Kbps	3904 Kbps	12,000 feet (3.66 km)

17-2 APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide