Watson-SHDSL-Router-Manual.doc
Version 1.0-03
Watson SHDSL Router
Operating Manual
2.4 Architecture
2.4.1 Block Diagram
Watson SHDSL router integrates an Ethernet Switch, an IP router and a SHDSL modem which
transport and process Ethernet/IP packets between the Ethernet user interfaces and the DSL wire
pairs:
DSL Wire pairs
Ethernet User Interfaces
Packet
Processor
SHDSL
modem
Ethernet
Switch
DSL1
DSL2
DSL3
DSL4
Trunk WAN
LAN
Port1
Port2
Port3
Port4
Port5
Port6
Port7
Port8
ETH1
ETH2
ETH3
ETH4
ETH5
ETH6
ETH7
ETH8
Port1
Port2
Port3
Port4
Figure 2-3: Watson SHDSL router block diagram
2.4.2 Ethernet Switch
Watson SHDSL router features an eight port Ethernet switch. Eight LAN ports (ETH1 .. ETH8) are
available at the back of Watson SHDSL router. The switch trunk port (Trunk) is connected internally
to the IP router LAN port (LAN). The Ethernet switch features a 2 Gbps non-blocking core which
guarantees wire-speed performances.
2.4.3 IP Router
The IP router features bridging, routing, security, VPN and many other functions.
Bridging bases the forwarding decision on the MAC (Media Access Control), or hardware address,
while routing does it on the network layer (IP) address. Bridging allows to transport packets of net-
work layer protocols that it does not route. In bridge mode all non-local packets are bridged to the
WAN.
The IP router includes comprehensive and robust security services: Statefull Packet Inspection
Firewall, user authentication protocols and password protection mechanisms. These features to-
gether allow users to connect their computers to the Internet and simultaneously be protected from
the security threats of the Internet.
IPSEC VPN capabilities allows to establish a Virtual Private Network (VPN) to connect with busi-
ness partners and branch offices using data encryption through the Internet. It provides secure
communications without the expense of leased lines. Watson SHDSL router VPN implementation is
based on the IPSec standard and is fully interoperable with other IPSec-based VPN products.
2.4.4 SHDSL Modem
The SHDSL modem is responsible for transporting the Ethernet packets over the DSL wire pairs.
The Packet Transport Mode (PTM TPS-TC layer) of the SHDSL ETSI TS 101 524 / ITU-T G.991.2
standards is used for this purpose. The modem supports the following two standardized packet
mode encapsulation: HDLC and IEEE EFM 64b/65b framing.
Revision: 2007-05-24 2-3
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