层: I storey; tier; stratum服务: give service to; be in the s ...单元: unit; unit element; cell; lo ...链路层服务单元: link layer service unit服务单元: lsu lan service unit lan存储服务单元: memory serve unit公共服务单元: csu common service unit密钥服务单元: ksu key service unit数据服务单元: data service unit dsu; dsu data service unit数字服务单元: data service unit; digital service unit通道服务单元: csu网络服务单元: nsu network service unit信道服务单元: csu channel service unit; csu service unit; csu(channel service unit)应用服务单元: ase application service element用户服务单元: csu customer service unit预制服务单元: service unit service module资料服务单元: data service unit dsu公共应用服务单元: case common application service element可靠传送服务单元: rtse reliable transfer service element可视图文服务单元: vsu videotex service unit联合控制服务单元: acs association control service element联系控制服务单元: association control service element使用者服务单元: user services消息传递服务单元: mdse message delivery service element消息管理服务单元: mase message administration service element
