3Com 5000 Series Installation Manual page 6

3Com Router 5000 Family
Installation Guide
III. Multiple channels of asynchronous serial interface access
Connected to PSTN (Public Switched Telephone Network) via the asynchronous
serial interface, the router can work as a small Internet access server.
With an analog Modem interface card, the router can be directly connected to
PSTN to serve as a small access server.
IV. Ethernet access solution
By extending SICs and MIMs, 3Com 5000 Routers can provide multiple forms of
Ethernet interfaces, such as optical/electrical interface, 10/100/1000Mbps interface.
Thereby, the networking capability of the router can be significantly improved.
V. Voice capabilities
3Com 5000 Routers support multiple voice interface modules, which can provide such
interfaces as FXO/FXS/E&M, E1VI, T1VI. The FXS/FXO/E&M interface can connect
common phone sets, fax machines and private branch exchanges (PBXs); the
CE1/PRI or CT1/PRI interface can connect the E1 or T1 interface of switches, as well
as communicating with the gatekeeper (GK). With high-speed CPU and digital signal
processing (DSP) technology, 3Com 5000 Routers can provide voice over IP (VoIP)
services with high quality voice. They can drive down the cost of long distance
communications between main office and branches in enterprise deployment.
VI. xDSL /MPLS features
xDSL is a simple but highly-efficient broadband technology that achieves the maximum
data transmission capacity over existing copper wiring by using the digital code
modulation technology. The ADSL/ADSL-I/G.SHDSL module for 3Com 5000 Routers
allows the medium-to-small-sized enterprises to access the Internet over DSLAM
equipment via PSTN.
MPLS, a combination of IP and ATM technologies, replaces the traffic identified by IP
header with a short and length-fixed label, based on which a router makes the
forwarding decision. It can provide faster forwarding speed, get support from IP routed
protocols, and control protocols, thus satisfying the requirements that various new
applications put on the network. MPLS VPN is a VPN technology that implements the
interconnection of private networks via Label Switched Paths (LSPs). As LSP is a
tunnel across the public network on its own, MPLS has an inherent advantage in terms
of VPN implementation. 3Com 5000 Routers usually act as Label Edge Routers (LERs)
to implement service classification, label distribution, encapsulation, and multi-label
peel-off by connecting an MPLS domain to a non-MPLS domain or connecting MPLS
domains of different service providers.
3Com Corporation
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Chapter 1 Overview