2 Overview
2.1 Introduction
The Watson Ethernet modems are SHDSL transmission systems compliant to
ITU-T G.991.2 Annex B (G.SHDSL.bis) and to ETSI TS 101 524 (2006).
SHDSL uses Trellis-coded PAM-16 and PAM-32 linecodes supporting multiple li-
nerates as well as 1-pair, 2-pair and 4-pair DSL transmission.
The Watson Ethernet modems are available as plug-in cards and as tabletop
units. Both plug-in cards and tabletops can work as DSL master modems (STU-
C) and as DSL slave modems (STU-R).
The modems can be configured with an RS-232 terminal through a command
line interface (Monitor).
For remote management a Telnet access to the Monitor is available. The plug-in
modems also have an SNMP agent integrated. One agent can control all plug-in
modems in a subrack and all tabletop modems connected to the subrack mod-
ems.
2.2 Applications
Figure 2-1 shows typical deployment scenarios of Watson Ethernet to deliver
Metro Ethernet Services:
Figure 2-1: Ethernet Services
Several Ethernet plug-in cards are installed in a subrack at the central office or
the point of presence. Depending on the service offered each plug-in can serve
between one and four customers. At the customer premises either a tabletop
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