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Tahoe DSL Access Multiplexer

DSL Access Multiplexer

The Tahoe DSL Access Multiplexer is a perfect solution for large DSL providers requiring concentration of a high number of DSL lines in a small space. Developed to combine performance, quality, and scalability, the Tahoe DSLAM takes advantage of the latest G.SHDSL technology to help operators address customers’ needs for greater bandwidth. The Tahoe DSLAM is a 19” rack-mountable, 3U high unit designed to gather multiple G.SHDSL.bis modems in one space saving system. It can hold up to 8 Tahoe 4681 cards each containing 4 modems, giving a total capacity of 32 G.SHDSL.bis lines. Each line is capable of working either individually or as part of a 1, 2 or 4 pair trunk. The Tahoe DSLAM is equipped with a management card and two hot-swappable, redundant power supplies. The management card provides central control of all devices and has a variety of management interfaces, including a local console and out-of-band Ethernet. For ease of use, the Tahoe DSLAM has a 4-button keyboard, Ethernet port, serial console port and a 4”colour LCD screen making it easy to view all operating parameters of cards within the chassis. The Tahoe DSLAM has the ability to support layer 2 bridged services with full VLAN support as well as Layer 3 routed services with NAT, firewall and access control lists.

The Benefits:

  • High throughput over significant lengths of copper cabling.
  • Total capacity of 32 G.SHDSL.bis lines
  • DHCP/BOOTP server allows hosts and other networked hardware to be configured automatically.
  • DHCP/BOOTP Relay Agent allows even large networks based on dynamic allocation of IP addresses to be easily managed using a single server.
  • Firmware upgrade using TFTP.
  • Additional protection against unauthorized LAN access.


  • 5.7Mbps over 1 pair
  • 11.4Mbps over 2 pairs
  • 22.8Mbps over 4 pairs
  • Utilises the very latest G.SHDSL.bis standards
  • Bridging and Routing functionality
  • NAT, DHCP, VLAN support
  • Management via LCD, HTTP, TELNET & VT-100
  • All cards are hot swappable
  • For use in conjunction with BT's EPS8 and EPS9 circuits

Management Card Features:

  • Telnet and SSH management
  • SNMP management
  • Serial console management
  • DHCP/BOOTP server (dynamic assigning of IP addresses and other parameters to each network station)
  • DHCP/BOOTP Relay Agent (relaying of the DHCP/BOOTP requests to a central server)
  • Firmware upgrade using TFTP
  • Logging through syslog
  • 802.1q VLAN support
  • Temperature measurement

Interfaces: Ethernet 10/100 Base-T; RS-232 Serial Console
Processor: Motorola PowerPC 50MHz
Memory: 64MB, SDRAM, 16MB Flash
Network Protocols: TCP, IP, UDP, ICMP, TFTP, SNMP, DHCP, BOOTP, IEEE 802.1q
Power Supplies:

  • Type - Fully redundant, hot-swappable
  • Voltage - 100-240 VAC, 50-60 Hz, (48 VDC version available on request)
  • Power Consumption - 150W

Dimensions: 483 mm (width, 19") x 132 mm (height, 3U) x 242 mm (depth)
Weight: 4.4 kg
Operating temperature: 0 to 50°C
Storage temperature: -20 to 80°C

NB: Also see the Tahoe 4681 is a 4-port G.SHDSL.bis card which provides a total capacity of 32 G.SHDSL.bis lines in a single Tahoe DSLAM.


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Live Demo of FRM220 Chassis

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