ISO/IEC 11518的这一部分规定了一种物理级接口，用于通过光纤电缆以800 Mbit/s或1600 Mbit/s的速度串行传输数字数据，传输距离可达10 km。所使用的信令序列和协议与HIPPI-PH、ISO/IEC 11518-1兼容，其距离限制为25米。HIPPI串行接口可以集成为主机的本机接口，也可以用作HIPPI-PH端口的外部扩展器 规范包括: ?并行数据的编码和序列化； ?链路重置所需的信号序列； ?串行信号的定时和光学要求； ?32位（800Mbit/s，100Mbyte/s）和64位（1600Mbit/s，200Mbyte/s）操作； ?单纯形和双单纯形操作。

This part of ISO/IEC 11518 specifies a physical level interface for transmitting digital data at 800 Mbit/s or 1 600 Mbit/s serially over fibre-optic cables across distances of up to 10 km. The signalling sequences and protocol used are compatible with HIPPI-PH, ISO/IEC 11518-1, which is limited to 25 m distances. HIPPI-Serial may be integrated as a host's native interface, or used as an external extender for HIPPI-PH ports Specifications are included for: ?the encoding and serialisation of the parallel data; ?the sequence of signals required for link reset; ?the timing and optical requirements of the serial signals; ?32-bit (800 Mbit/s, 100 MByte/s) and 64-bit (1 600 Mbit/s, 200 MByte/s) operation; ?simplex and dual simplex operation.