Verilink DIU 2130 (880-503297-001) Product Manual - Manual (Page 71)

56K NMS Option Overview
Verilink 6-11
Managing Alarms
The 56K NMS Option generates the following alarms:
ASC Abnormal Station Code
CMI Control Mode Idle
LB Local Loopback Alert
MOS Mux-Out-of-Sync
TM Local Test Started
UMC Unassigned Mux Channel
Group 1 DDS Codes
• BLK (Block Code)
• MA (MJU Alert)
• RLS (Release Code)
• TA (Test Alert)
• TC (Test Code)
Alarm Detection Detection of alarms is based on exceeding the thresholds based on
a “leaky bucket” algorithm. The thresholds are variable and can be
set by the user in seconds from 1 to 255. Setting the alarm
thresholds to 0 will disable the alarms (same options as CSU alarm
configuration). If the DDS control code is received continuously for
the specified period then the alarm is declared. If the circuit is
intermittent, the integration process decays at the rate of 1/5 of
the rise slope. Alarms clear when 15 seconds have elapsed without
the DDS control code.
Alarm
Parameters
The following DDS status codes have an associated alarm threshold
which will cause an alarm to be generated when reached:
Abnormal Station Code (ASC)
This indicates that channelized data upstream is disrupted.
Control Mode Idle (CMI)
This is an idle pattern sent when no channelized data is
present. This may be normal for some types of circuits.
MUX-Out-Of-Sync (MOS)
Indicates that a loop is established upstream or the DS-1
signal is in an out-of-frame condition.
Unassigned MUX Channel (UMC)
Similar to MOS, an upstream device has disrupted the
transmission path.