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Не ищите на нашем сайте оборудование линейки CT-XXX, мы прекратили рекомендовать это оборудование к использованию, поскольку в последней ревизии hardware этой линейки используются другие чипсеты, которые показали неудовлетворительные результаты при пробной эксплуатации.

Рекомендуем использовать линейку MAXMODEM

MAXMODEM 23SR modem + router


ITU-T G.991.2 (G.shdsl)

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, in cluding 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
  • Bridge/router function
  • G.shdsl
  • Auto-negotiation rate adaptation
  • Fully ATM protocol stack implementation over SHDSL
  • PPPoA and PPPoE support user authentication with PAP/CHAP/MS-CHAP
  • 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
  • Bridging 801.1q

WAN Interface (SHDSL port)

SDSL standard

ITU-T G.991.2 (G.shdsl Annex A, Annex B)

Line rate

72K To 2312 Kbps

Data rate

N*64Kbps , N=1~36

Encoding scheme



135 Om

ATM Attributes
Traffic Shaping UBR Yes
AAL5 Yes
VCs 8
ATM Forum UNI 4.0 Yes
OAM F5 Loopback Yes
AAL5 Encapsulation
Multiplexing and SNAP/LLC Yes
Ethernet over ATM (RFC 1483) Yes
PPP over ATM (RFC 2364) Yes
Classical IP over ATM (RFC 1577) Yes
PPP over Ethernet (RFC 2516) Yes
PPP over ATM (RFC 2364) Yes
User Authentication with PAP/CHAP/MS-CHAP Yes
Console port RS232/DB9
Telnet Yes
Web-based management Yes
Password Control Yes
SNMPv1/SNMPv2 Agent Yes
TFTP download Yes
LED Indicators General: PWR WAN: LNK, ACT LAN: LNK/ACT, 100M
Local interface(One Ethernet port)
Standard IEEE 802.3 10Base-T
IEEE 802.1D Transparent Bridging Yes
IP static route Yes
Static Routing and RIPv1/RIPv2 Yes
IP Masquerading NAT/PAT Yes
DHCP Server Yes
DNS Relay and Caching Yes
Power Supply
External power adapter 220 VAC
Power consumption 6 watts
Height x Width x Depth 18.7 x 3.3 x 14.5 cm (WxHxD)
Note: Specifications are subject to change without notice.

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ITU-T G.991.2 (G.shdsl)

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
G.shdsl Summary of Benefits
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.

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