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Configuring DSL Connections (DSLTNT)
Introduction to DSL technologies
APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide Preliminary May 9, 2000 17-3
SDSL overview
The SDSL card supports symmetric data transfer rates of 768 Kbps for a distance of up to
12,000 feet (3.7 km) over a single pair of copper wires.
The SDSL-HS data card expands on features offered in the 16-port SDSL card. The SDSL-HS
data card provides high port density, with 24 SDSL lines per card. The card supports
high-speed symmetric data transfer, with rates up to 1.5 Mbps and distances to 14,000 feet
(4.3km), through a single pair of copper wires. At reduced data transfer rates, the card supports
distances over 18,000 feet (5.5km). The SDSL-HS data card has an SDSL chip and board
layout that differ from the 16-port SDSL card and that provide high speed, multirate
capabilities. The 16-port SDSL card cannot be upgraded to the SDSL-HS technology.
The SDSL-HS card is compatible with the DSLPipe products but must be set to 768 Kbps to
work properly with the DSLPipe-S, or to 400, 784 or 1168 Kbps to work with the DSLPipe-2S.
SDSL supports Frame Relay and Point-to-Point Protocol (PPP). You configure Frame Relay or
PPP connections on an SDSL connection in the same way you configure them on a T1 or serial
WAN (SWAN) interface.
The SDSL-HS card supports the following symmetric transfer rates:
Note: The data transfer rates presented in the table above are approximations. Actual data
transfer rates depend on line loop quality and can vary.
Wire gauge
(AWG)
Upstream rate Downstream rate Distance
24 928 Kbps 9248 Kbps 10,000 feet (3.05 km)
26 736 Kbps 6976 Kbps 10,000 feet (3.05 km)
Wire gauge (AWG) Data transfer rate Distance
24 400 Kbps 18,000 feet (5.5 km)
26 400 Kbps 14,500 feet (4.4 km)
24 784 Kbps 18,000 feet (5.5 km)
26 784 Kbps 13,000 feet (3.96 km)
24 1.168 Mbps 16,000 feet (4.88 km)
26 1.168 Mbps 11,000 feet (3.35 km)
24 1.5 Mbps 13,000 feet (3.96 km)
26 1.5 Mbps 10,000 feet (3.05 km)