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Revision: 2006-04-27
2-1
2 Overview
2.1 Introduction
The Watson 5 Ethernet modems are SHDSL transmission systems compliant to ITU-T G.991.2 An-
nex B (G.SHDSL.bis) and to ETSI TS 101 524 (ETSI eSDSL).
SHDSL uses Trellis-coded PAM-16 and PAM-32 linecodes supporting multiple linerates as well as
1-pair, 2-pair and 4-pair DSL transmission.
The Watson 5 Ethernet modems are available as plugin cards and as tabletop units. Both plugin
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 commandline interface (Moni-
tor).
For remote management a Telnet access to the Monitor is available. The plugin modems also have
an SNMP agent integrated. One agent can control all plugin modems in a subrack and all tabletop
modems connected to the subrack modems.
2.2 Applications
Figure 2-1 shows deployment of Watson 5 Ethernet to deliver Point – to – Multipoint Ethernet Ser-
vices:
Ethernet
Transport
4 x Ethernet
22.8 Mbps
4 x Ethernet
9.2 Mbps
1 x Ethernet
4.6 Mbps
1 x Ethernet
2.3 Mbps
n x Ethernet
10/100 Mbps
1 pair/3 km
2 pairs/3 km
4 pairs/3 km
4 pairs/1.5 km
Figure 2-1: Point-Multipoint Ethernet Services
Several Ethernet plugin cards are installed in a subrack at the central office or the point of pres-
ence. Depending on the service offered each plugin can serve between one and four customers. At
the customer premises either a tabletop modem (for linerates up to 4.6 Mbps) or a plugin card in a
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