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2-WIRE SHORT-RANGE DSL LINE DRIVER (MDSL)
2. Introduction
2.1 Description
The 2-Wire Short-Range Line Driver (mDSL) 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 mDSL Line Driver allows you to add additional
nodes to a LAN that has reached its maximum distance limits or 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 supports PPP (RFC 1661) and BCP (RFC 1638).
The 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 Carrierless Amplitude and Phase (CAP) modulation. The Line Driver
connects to the DSL line via an RJ-45 jack. The Line Driver is powered by a
universal (100 to 240-VAC) power supply.
2.2 Features
• Provides MAC Level Data Link (Layer 2) connection between two peered
10BASE-T Ethernet LANs.
• Operates transparently to higher level protocols such as TCP/IP, DECnet™,
NetBIOS, and IPX™.
• PPP (Point-to-Point Protocol, RFC 1661) with Bridge Control Protocol
(RFC 1638).
• Automatically learns, loads, and removes MAC addresses.
• Point-to-point connectivity over 2-wire mDSL up to 10 km.
• Plug-and-play slave.
• HTTP/SNMP manageable as CP (Customer Premises) unit with ME0004C
rack card as the central office unit.
• Internal or receive recovered clocking between units.
• LED indicators for 10BASE-T Link, DSL Link, Status, No Signal, Error, and
Test Mode.
