One IBM serial null modem cable

一根 IBM 串口直连线缆（serial null modem cable）。

youdao

A serial line (null-modem cable) connects the machines through their serial ports.

一条串行线(空调制解调器电缆)将通过机器的串口连接它们。

youdao

Use a null modem cable to connect the two nodes through their serial ports. Now test the serial connection, as follows.

通过两个节点的串口，使用一根直连线缆将它们连接起来。

youdao

Ideally, that machine would have no network connection (as it would be a prime break-in target), and be reported to via null-modem serial cable only.

CNN: Analysis: Linux security