Specifications

Reference Guide
7-45
WAN Card WAN Card User Screens and Settings
LOFC
The Loss of Frame Count (LOFC) is the number of times a Loss Of Frame (LOF) is declared.
An LOF is declared after 2.5 seconds of a continuous Loss Of Synchronization (LOS) or
Out-Of-Frame (OOF) condition. The LOF is cleared after no more than 15 consecutive
seconds without another LOS or OOF.
SLIP
A Slipped Second is any second that contains one or more Controlled Slips. A Controlled Slip
is the deletion or replication of a T1 or E1 frame by the receiving equipment.
DM
A Degraded Minute (DM) is any minute during the reporting period that has an error rate
greater than 10-
6
as described in ITU-T G.821. The count for this field is from 1 to 15, rather
than 1 to 900 for the other fields.
STATUS
If one of the described errors occurs during any of the 15-minute intervals, the status column
for that period would display the code for that error. The codes are displayed at the bottom of
the screen. The values are
Y
(Yellow Alarm received),
N
(No Signal),
T
(Test Mode - line
loopback, local loopback, payload loopback, or standby),
L
(Loss of Synchronization – 2 out
of 4 frame bits in error),
O
(Out of Service),
B
(Bipolar Violation), and
E
(Excessive Error
Rate).