Cronyx Telecom

123458, Russia, Moscow, 8 Tvardovskogo St., building "B", office 103, Cronyx Telecom


Low-cost Adapter Sigma-22


  • Two full duplex serial ports
  • Up to 384 kbps
  • V.35/RS-232 or RS-530(RS-449)
  • Independent synchronous/asynchronous mode selection per port
  • Full modem control
  • Two independent baud rate generators per port for transmit and receive
  • DMA bus master
  • Certificate N OS/1-SPD-695 of Russian Ministry of Communications

The Sigma-22 is a middle speed (up to 384 kbps) synchronous/asynchronous adapter intended for use with IBM PC and compatible computers.

Sigma-22 adapter is based on the CL-CD2431 controller chip (a product of Cirrus Logic Corp., USA). It supports master mode DMA data transfer providing the most efficient use of the PC input/output bus. Interface options cover RS-232, V.35, RS-530 and RS-449 standards. The adapter is software-configurable. Only I/O Base Address is jumper selectable.

The Cronyx-Sigma software allows to join several physical synchronous communication channels into one logical channel. For example, two channels with data rate 128 kbps, joined together, will create the logical channel with the overall throughput of 256 kbps.

There are several models of Sigma adapter available, supporting different serial interfaces.

Currently available models are listed in Prices. Please, contact technical support if you are unsure which model to choose.

PC Bus Interface:
Bus TypeISA, 16 bit
I/O Base Address240h, 260h, 280h, 300h, 320h, 380h, 3A0h, Jumper Selectable
I/O Address Space32 Bytes
InterruptsIRQ 3, 5, 7, 10, 11, 12, 15, Software Selectable
DMA ChannelsDMA 5, 6, 7, Software Selectable
DMA TransfersMaster Mode, Word Bursts
Addressable Memory16 Mbytes
Serial Interfaces:
Interface TypeRS-232/V.35Channel 0: RS-232/V.35RS-530 (RS-449)
Channel 1: RS-530 (RS-449)
Data Transfer Rate per direction for each channel simultaneous operation192 kbps
Maximum Single Channel Data Transfer Rate384 kbps
Bit Rate GeneratorIndependent per channel per direction
Synchronous ProtocolHDLC
Asynchronous Transfer5-8 Bits/Character, 1/1.5/2 Stop Bits
Sync Mode Error DetectionCyclic Redundancy Check CRC-16, CRC V.41
Async Mode Error DetectionParity Bit
Clock OptionsTXCIN, RXCIN, TXCOUT or DPLL, Software selectable per channel
Modem Control Signals SupportedDTR, DSR, CTS, RTS, CD
Board SizeHeight: 105 mm, Width: 165 mm
Operating Systems and Protocols
Windows NT/2000PPP
FreeBSD 4.x, 5.x, 6.xPPP, Cisco/HDLC, Frame Relay
LinuxPPP, Cisco/HDLC, Frame Relay

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