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17-2 Preliminary May 9, 2000 APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide
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:
The ADSL-DMT card supports the following maximum 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)
Wire gauge
(AWG)
Upstream rate Downstream rate Distance
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)