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The errors reported by the CSU are:
•
ESF error events — An Extended Superframe Format (ESF) error event is an ESF frame
that contains a CRC-6 error event or an OOF state, or both. ESF error events are processed
to derive ESs and severely ESs.
•
Errored seconds (ESs) — An ES is a second with one or more ESF error events.
•
Severely errored seconds — A severely ES is a second with 320 or more ESF error events.
Severely ESs are also processed to derive failed sig-nal states.
•
Failed signal states — A failed signal state occurs when 10 consecutive severely ESs occur.
While in a failed signal state, no ESs are counted. For every second a failed signal state
exists, an FS results.
•
Failed seconds (FSs) — An FS is counted for every second a failed signal state exists.
How these errors are related and derived is shown in Figure 3-8.
DS1 DIAGNOSTICS
SYN NNS YEL AIS NLB BPV CRC TSY TNS O'S LAD LT ST RT LOR DS0LB
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A
Alarm Counts
O
One Hour Report
T
Twenty-Four Hour Report
C
Scheduled Performance Report
S
Self Test
L
Loopback
R
Receive Level
E
Exit
Select Option :
In Unframed Mode, the One Hour Report, Twenty-Four
Hour Report and Scheduled Performance Report
selections are removed from the DS1 DIAGNOSTICS
menu (the entire bandwidth is used for customer pay-
load, so network performance is not measured and
these screens do not apply).
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.
FIGURE 3-7. DS1 DIAGNOSTICS MENU
NOTE
.
.
.
.
NOTE:SHADED ITEMS ARE NOT
SHOWN IN UNFRAMED MODE.
OPERATION
DD-MM-YY HH:MM
.
.
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.
CSU : ***
3-13
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