Zhone IMA CS-200 System Reference Manual page 143

WAN ports
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Main
ES
An Errored Second (ES) is a second with one or more CRC-6 (ESF) or BPV (D4/D-Frame)
errors, one or more OOFs, or one or more Controlled Slips.
UAS
An Unavailable Second (UAS) is any second during which service is unavailable. An
unavailable signal state is declared after ten consecutive Severely Errored Seconds (SESs) are
logged. An unavailable state is cleared after ten consecutive non-Severely Errored Seconds
are logged. Unavailable Seconds are also accumulated if the port has an out-of-service (OOS)
condition.
SES
A Severely Errored Second (SES) is any second with 320 or more CRC-6 (ESF) or BPV
(D4/D-Frame) errors, or one or more OOF errors.
BES
A Bursty Errored Second (BES) is any second with more than one and fewer than 320 CRC-6
(ESF) or BPV (D4/D-Frame) errors.
FE
The Framing Error (FE) is incremented whenever an incorrect or unexpected framing bit is
received in a one second window.
SLIP
A Slipped Second is any second containing one or more Controlled Slips. A Controlled Slip
is the deletion or replication of a DS1 frame by the receiving equipment.
WAN Ports
Clears the Far-End Network Registers display on the local terminal.
Pages through the performance statistics for the current 15-minute period
and periods 96-1.
Pages through the performance statistics for the current 15-minute period
and periods 1-96.
Returns to the WAN port Main Screen.
WAN port User Screens and Settings
5-13