SDH Digital Path同步数字通道、SDH数字通道 Severely Errored Second严重误块秒 Severely Errored Second Rati。严重误块秒比 .
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severely errored second ratio 严重误码秒比 ; 严重误块秒比
SES Severely Errored Second 严重误码秒
SESR Severely Errored Second Ratio 严重误码秒比
Continuous Severely Errored Second 连续严重误码秒
Far End Severely Errored Second 远端严重误码秒
severely errored frame second 严重误帧秒
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