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CHAPTER 2: Introduction
2. Introduction
2.1 Description
The 2-Wire Short-Range DSL Line Driver (HDSL) 10BASE-T is a multi-rate DSL
modem that provides seamless MAC Layer connectivity between two peered
10BASE-T LANs. Enterprise users no longer need to hassle with a bridge and a
CSU/DSU or recurring leased-line costs. The HDSL Line Driver lets you a) add
additional nodes to a LAN that has reached its maximum distance limits, or
b) separate high-traffic areas of a LAN. The Line Driver connects peered LANs and
automatically forwards and receives LAN broadcasts, multicasts, and frames across
a 2-Wire DSL span. The Line Driver is 802.3 compliant and supports PPP (RFC
1661) and BCP (RFC 1638).
The HDSL Line Driver features include loopback diagnostics, inband
SNMP/HTTP remote management capabilities using Plug-and-Play, and externally
accessible configuration switches. As a symmetric DSL modem, the Line Driver
offers the same data rates in both directions over a single pair of regular telephone
lines using 2B1Q modulation. The Line Driver connects to the DSL line via an
RJ-45 jack. Power is supplied via a universal (100 to 240-VAC) power supply.
2.2 Features
• Provides MAC level (Layer 2) connection between two peered 10BASE-T
Ethernet LANs.
• Operates transparently to higher-level protocols such as TCP/IP, DECnet,
NETBEUI, and IPX™.
• PPP (Point-to-Point Protocol, RFC 1661) with Bridge Control Protocol (RFC
1638).
• Automatically discovers, loads, and deletes MAC addresses.
• Point-to-point connectivity over 2-wire HDSL up to 5 km.
• HTTP/SNMP Manageable as CP (Customer Premises) unit with a High-Speed
2-Wire Short-Range DSL Rack Card (ME0003C) CO (Central Office).
• Internal or receive recovered clocking between units.
• LED indicators for 10BASE-T Link, DSL Link, Status, No Signal, Error, and
Test Mode.
