---
name: "cue"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["linux", "freebsd", "openbsd"]
url: "https://new.carta.tech/cue"
---

# cue(4)

CATC USB-EL1201A USB Ethernet device

## NAME

**cue** – CATC USB-EL1201A USB Ethernet device

## SYNOPSIS

**cue\* at uhub?**

## DESCRIPTION

The **cue** driver provides support for USB Ethernet adapters based on the Computer Access Technology Corporation's USB-EL1202A chipset. This includes the following adapters:

- Belkin F5U111

  - CATC Netmate

  - CATC Netmate II

  - SmartBridges SmartLink

  The USB-EL1202A supports a 512-bit multicast hash filter, single perfect filter entry for the station address and promiscuous mode. Packets are received and transmitted over separate USB bulk transfer endpoints.

The CATC adapter supports only 10Mbps half-duplex mode, hence there are no [ifmedia(4)](/ifmedia/4.md) modes to select.

For more information on configuring this device, see [ifconfig(8)](/ifconfig/8.md).

## DIAGNOSTICS

- cue0: watchdog timeout

  A packet was queued for transmission and a transmit command was issued, however the device failed to acknowledge the transmission before a timeout expired.

- cue0: no memory for rx list

  The driver failed to allocate an mbuf for the receiver ring.

## SEE ALSO

[arp(4)](/arp/4.md), [intro(4)](/intro/4.md), [netintro(4)](/netintro/4.md), [usb(4)](/usb/4.md), [hostname.if(5)](/hostname.if/5.md), [ifconfig(8)](/ifconfig/8.md)

## HISTORY

The **cue** device driver first appeared in FreeBSD 4.0. OpenBSD support was added in OpenBSD 2.7.

## AUTHORS

The **cue** driver was written by Bill Paul ⟨*wpaul@ee.columbia.edu*⟩ and ported to OpenBSD by Aaron Campbell ⟨*aaron@openbsd.org*⟩.