Tahoe

Tahoe 671

  • Tahoe 671
  • Tahoe 671

G.shdsl+ modem with G.703 interface

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Description

Tahoe 671 is a 2-wire G.shdsl+ modem with a G.703 interface. It transmits an E1 stream at a rate from 128 to 2048 kbps over a single copper pair.

It supports TCPAM-32 modulation, more efficient than the TCPAM-16 of the G.shdsl standard, as well as the lower-order modulations, so it interoperates with equipment from other manufacturers.

Applications

  • linking telephone exchanges
  • transmitting an ISDN PRI signal
  • up to 30 digital channels on a single copper pair instead of one analogue channel
  • transmitting part of an E1 stream over long distances

Features

The G.703 interface works in unframed or framed (G.704) mode. In framed mode the modem can transmit only selected timeslots when a long line does not allow the full 2048 kbps.

The software allows you to set the data rate in 64 kbps steps, the modulation type and the message language, and to measure line attenuation and signal-to-noise ratio. The remote modem can be managed over the leased line itself, in an auxiliary channel, without interrupting transmission. The full list of features is in the Technical data tab.

Configuration is done from the built-in LCD display and keypad or via the serial console.

Several hardware and software watchdogs monitor the device, from basic processor functions to network communication. The metal enclosure is designed for years of continuous operation.

Technical data

Throughput128 kbps to 2048 kbps on a 2-wire line (set with 64 kbps step)
StandardsG.shdsl, conforms to ITU G.991.2
ModulationTCPAM-32, TCPAM-16, TCPAM-8, TCPAM-4, PAM-16, PAM-8, PAM-4 (2B1Q)
Features
  • built-in LCD and keyboard for easy configuration
  • serial console management
  • remote modem management through DSL line
  • transmission of selected timeslots of an E1 stream on links slower than 2048 kbps
G.703 interface
  • framed or unframed
  • balanced 120 ohm
  • RJ-45 connector
  • reach up to 2000m
  • HDB3 coding, CRC4 support
ProcessorMotorola MC68302
Dimensions200 mm (width) x 130 mm (depth) x 45 mm (height)
Power supply15-30V, 260-130 mA, 3.5W (110-230V/50-60Hz power supply included)

Reach

Values below were measured on a test line of 0.5mm wire diameter. They depend on an actual line and thus are not guaranteed. They may be different - higher or lower - in an individual case.

Throughput

Reach

2048 kbps 3900 m
1024 kbps5000 m