护套    Jacket

干扰信号比    Jam-to-signal ratio

抖动    Jitter

抖动容限    Jitter toleration

抖动传递特性    Jitter transfer function

联合电路    Joint Circuit

联调    Joint Debugging

飞线    Jump Wire

跳线    Jumper

分线盒    Junction Box, Connection Box, Connector Box

枢纽站    Junction Center Station

垃圾邮件    Junk mail

零库存    Just-in-time JIT