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Dual internal short range modem Tau/G703

Discontinued, recommended replacement is: Tau-PCI/2E1


Dual short range modem Tau/G703 Features:
  • Up to 2.5 km
  • Two G.703 2.048 Mbps line interfaces
  • Extra V.35/RS-530/RS-449/RS-232 data interface
  • Full duplex synchronous mode
  • Selectable data rates
  • Local and line loopbacks
  • Internal modem for IBM PC, ISA bus

The Tau/G.703 is an adapter board for IBM PC and compatible computers with ISA bus. It incorporates two G.703 short range modems and one digital interface for a standby link. The short range modems operate at distances of up to 2.5 km

The Cronyx-Tau software allows to join several physical synchronous communication channels into one logical channel. For example, two G.703 channels with data rate 2048 kbps, joined together, will create the logical channel with the overall throughput of 4096 kbps.

The Tau/G703 is discontinued and overrided by TAU-PCI/2E1/4E1.


PC Bus Interface
Bus Type ISA, 16 bit
I/O Base Address 200h - 3e0h, Jumper Selectable
I/O Address Space 32 Bytes
Interrupts IRQ 3, 5, 7, 10, 11, 12, 15, Software Selectable
DMA Channels DMA 5, 6, 7, Software Selectable
DMA Transfers Master Mode, Word Bursts
Addressable Memory 16 Mbytes
Serial Interface
Data Transfer Rate per direction for each channel simultaneous operation 4 Mbps
Bit Rate Generator Independent per channel per direction
Synchronous Protocol HDLC
Asynchronous Transfer 5-8 Bits/Character, 1/1.5/2 Stop Bits
Sync Mode Error Detection Cyclic Redundancy Check CRC-16, CRC-CCITT
Async Mode Error Detection Parity bit
Clock Options TXCIN, RXCIN, TXCOUT or DPLL, Software selectable
Modem Control Signals DTR, DSR, CTS, RTS, CD
G.703 Interfaces (2048 kbps)
Data Transfer Rate 64, 128, 256, 512, 1024 and 2048 kbps, Software selectable per channel
Line Code AMI or HDB3, Software selectable per channel
Line Impedance 120 Ohm (Twisted Pair) or 75 Ohm (Coax Cable), Jumpers selectable per channel
Receive Signal Attenuation Range from 0 to 43 dB (up to 2.6 km of 22 AWG twisted-pair cable)
Line Attenuation Monitoring 4 Levels: 0 dB, -9.5 dB, -19.5 dB, -28.5 dB
Jitter Attenuator 32 bits depth, in the receive path
Error Detection Bipolar Violation
Board Size Height: 100 mm, Width: 167 mm
Operating Systems and Protocols
Linux PPP, Cisco/HDLC, Frame Relay
FreeBSD 4.x, 5.x, 6.x
(FreeBSD 7.x is not supported)
PPP, Cisco/HDLC, Frame Relay


Некоторые документы хранятся в формате Adobe® Acrobat® Reader®

PDF  User's Manual in Russian
PDF  Driver Development Kit Manual in Russian
TXT  V.35 cable scheme
TXT  RS-232 cable scheme
PDF Справочник по интерфейсным кабелям Cronyx.

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