Zhone IMA CS-200 System Reference Manual page 141

WAN ports
DM
A Degraded Minute (DM) is any minute during the reporting period that has an error rate
greater than 10-
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), B (Bipolar Violation), and E (Excessive Error Rate).
WAN Ports
as described in ITU-T G.821. The count for this field is from 1 to 15, rather
6
WAN port User Screens and Settings
5-11