ADM      Add-Drop Multiplexer                      分/插復(fù)用器
AIS      Alarm Indication Signal                   告警指示信號(hào)
ATM      Asynchronous Transfer Mode                異步傳輸模式
AU       Administrative Unit                       管理單元
AUG      Administrative Unit Group                 管理單元組
CRC      Cyclic Redundancy Check                   循環(huán)冗余校驗(yàn)
CV       Coding Violation                          編碼違例
DXC      Digital Cross Connect                     數(shù)字交叉連接
FDDI     Fiber Distributed Data Interface          光纖分布式接口
ID       Identifier                                識(shí)別符
LOF      Loss Of Frame                             幀丟失
LOS      Loss Of Signal                            信號(hào)丟失
OAM      Operation Administration and Maintenance  運(yùn)行、維護(hù)和管理
OOF      Out Of Frame                              幀失步
OW       Order Wire                                公務(wù)
PDH      Plesiochronous Digital Hierarchy          準(zhǔn)同步數(shù)字體系
PSTN     Public Switched Telephone Network         共用電話交換網(wǎng)
RDI      Remote Defect Indication                  遠(yuǎn)端缺陷指示
SDH      Sychronous Digital Hierarchy              同步數(shù)字體系
TUG      Tributary Unit Group                      支路單元組
VC       Virtual Container                         虛容器