E8491B是带有资源管理器和0槽能力的高速C尺寸设备。其逻辑地址为0，因此总是主机箱的资源管理器，通常安装在主机箱的0槽。高速的实现部分是通过使用在双绞线上差分传输具有可控阻抗特性的小信号(200 mV)。该差分信号提供高噪声抗扰度。
E8491B包括C尺寸VXI 0槽模块和一条4.5m的电缆。由于无需关断电源即可自动识别新的IEEE-1394基设备，因而能容易完成配置，这一特性称为"热插入"。
E8491B选件001是基于OHCI的IEEE-1394/PCI主适配器卡。这是能以高达400 Mbits/s速率传输数据的PC插卡。插卡上有3个外部 1394端口。如果需要，基于OHCI的IEEE-1394/PCI卡能为需要电源的IEEE-1394设备提供达1.5A的12V电源。
特点：
The E8491B is a high-speed C-size device with Resource Manager and Slot 0 capability. Its logical address is 0, therefore it is always the mainframe's Resource Manager and is typically installed in mainframe Slot 0. The high speed is accomplished, in part, through the use of small signals (200 mV) that are transmitted differentially over the twisted-pair wire set with controlled-impedance characteristics. The differential signal provides high-noise immunity.
The E8491B includes a C-size VXI Slot 0 module and a 4.5-meter cable. Ease of configuration is achieved with automatic recognition of a new IEEE-1394-based device without powering down the PC, known as "hot plug-in."
The E8491B Option 001 is an OHCI-based IEEE-1394/PCI host adapter card. It is a PC plug-in card capable of transferring data at up to 400 Mbits/second. This card requires connection to the PC 12V disk drive power bus (not available on some industrial PC models) via a supplied cable. The card has three external 1394 ports. If required, the OHCI-based IEEE-1394/PCI card can supply 12 V at up to 1.5 A for IEEE-1394 devices that require power.
Features：
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