MAXMODEM 23SR SDSL modem + router satisfy the needs of multiple users for small office/home office and remote office/branch office applications. They provide a symmetrical transmission speed up to 2.3 Mbps through SDSL connection over one ordinary telephone line. In addition, they support up to 8 virtual concurrent connections to multiple destinations. The MAXMODEM 23SR can be used for variety of applications, including video conferencing, remote training, e-commerce, and other multimedia applications. Easy configuration and monitoring can be accomplished by using browser. The MAXMODEM 23SR SDSL router has full routing capabilities to segment/route IP protocol and is capable of bridging other protocols. It can be also configured in either server or client mode providing a point-to-point connectivity between two LAN.

• Compact and high performance standalone units
• Efficient IP routing and transparent learning bridge to support broadband Internet services
• G.shdsl
• Auto-negotiation rate adaptation
• Fully ATM protocol stack implementation over SHDSL
• PPPoA and PPPoE support user authentication with PAP/CHAP/MS-CHAP
• NAT/PAT
• DHCP
• DNS
• VC-based and LLC multiplexing
• Up to 8 VCs
• QoS
• One Ethernet port for LAN connection
• One console port for local management
• SNMP management with SNMPv1/SNMPv2 agent and MIB II
• Web-based management
• Configuration backup and restoration
• Static Routing and RIPv1/RIPv2
• Efficient IP routing and transparent learning bridge to support broadband Internet services
• DMZ host/Multi-DMZ/Multi-NAT enables multiple workstations on the LAN to access the Internet for the cost of IP address
• Bridging 802.1q, VPN pass-through for safeguarded connections (up to 1536 byte)

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This diagram shows the PSDs associated with G.shdsl

and SDSL-2B1Q at a 768kbps data rate. PSD is a representation of the energy associated with a signal across a band of frequencies. Likewise, it is indicative of the potential for interference with ADSL in its upstream and downstream directions. In the downstream direction there is little difference in the effect either technology may have on the transmitted ADSL signal. However, the downstream, or high bandwidth direction, of ADSL may be significantly affected by

SDSL-2B1Q and is affected very little by G.shdsl.

Figure 4 depicts the 1% worst case performance

in a 49 disturber Self NEXT environment on 26AWG copper. In other words, performance is expected to be better than shown in 99% of the deployments. For a given rate, G.shdsl increases range by 15% to 20%. For a given range, G.shdsl increases rate performance by 35% to 45% over

SDSL-2B1Q.

The G.shdsl Recommendation is a culmination of the knowledge gained from experience with earlier DSL technologies and the advances in DSP design. It is likely to become the most common solution for DSL deployment in nearly any symmetric application requiring bandwidths from 192kbps to 2.3Mbps for the following reasons:

• Rate/range adaptability, providing access to subscribers beyond traditional limitations over a single copper pair.

• Spectral compatibility with services co-existing in the same binder group or cable.

• Interoperability in a multivendor environment to ensure numerous cost-effective, competitive network solutions.

• Robust performance for ease of installation and predictable performance in noisy, real-world implementations.