---
name: "ctau"
section: "4"
platform: "linux"
package: "freebsd-manpages"
version: "6.0-5"
release: "Debian 4.0 (Etch)"
platforms: ["linux"]
url: "https://new.carta.tech/ctau"
---

# ctau(4)

driver for synchronous Cronyx Tau WAN adapters

## NAME

**ctau** – driver for synchronous Cronyx Tau WAN adapters

## SYNOPSIS

**device ctau**

Additional options: **device sppp** **options NETGRAPH** **options NETGRAPH\_CRONYX**

In */boot/device.hints*: **hint.ctau.0.at="isa"** **hint.ctau.0.port="0x240"** **hint.ctau.0.irq="15"** **hint.ctau.0.drq="7"**

## DESCRIPTION

The **ctau** driver needs either [sppp(4)](/sppp/4.md) or [netgraph(4)](/netgraph/4.md). Which one to use is determined by the NETGRAPH\_CRONYX option. If this option is present in your kernel configuration file, the **ctau** driver will be compiled with [netgraph(4)](/netgraph/4.md) support. Otherwise, it will be compiled with [sppp(4)](/sppp/4.md) support.

The base I/O port address specified in */boot/device.hints* must match the port address set by the jumpers on the board. The DMA I/O channel and interrupt request numbers are configured by software at adapter initialization. Legal values are:

- Port:

  0x200, 0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x2e0, 0x300, 0x320, 0x340, 0x360, 0x380, 0x3a0, 0x3c0, 0x3e0

- IRQ:

  3, 5, 7, 10, 11, 12, 15

- DMA:

  5, 6, 7

The **ctau** driver supports autodetection. As for all non-PNP hardware, using autodetection could lead to some potential problems with other devices during the hardware detection process. It is always better to specify hardware resources manually.

Refer to sconfig(8) for information about the **ctau** adapter configuration.

## HARDWARE

The **ctau** driver supports the following cards:

- Cronyx Tau (RS-232/V.35)

- Cronyx Tau/R (RS-530/RS-449)

- Cronyx Tau/E1 (fractional E1)

- Cronyx Tau/G703 (unframed E1)

## SEE ALSO

[cp(4)](/cp/4.md), [cx(4)](/cx/4.md), [sppp(4)](/sppp/4.md), [ifconfig(8)](/ifconfig/8.md), sconfig(8), spppcontrol(8)

## HISTORY

The **ctau** driver was added in FreeBSD 5.3 and FreeBSD 4.10. The **ctau** driver for previous versions of FreeBSD is available from *http://www.cronyx.ru/*.