LED State Definition
RED On (Red) A Red alarm state has been detected. This represents
a local alarm state of Loss of Carrier (LOS), Loss of
Frame (LF
AS), or Loss of CRC Multiframe (LMAS).
Off No Red (local) alarm.
YEL On (Yellow) A Yellow alarm state has been detected. This
represents a remote alarm indication from the far end.
The alarm may be either Alarm Indication (AIS) or
Remote Alarm (RAI).
Off No Yellow (remote) alarm.
LBK On (Green) NTBK50 2.0 Mb PRI is in loopback mode.
Off NTBK50 2.0 Mb PRI is not in loopback mode.
CC On (Red) The clock controller is software-disabled.
On (Green) The clock controller is enabled and either locked to a
reference or in free-run mode.
Flashing (Green) NTAK20 is equipped and attempting to lock (tracking
mode) to a reference. If the LED flashes continuously
over an extended period of time, check the CC ST
AT
in LD 60. If the CC is tracking, this may be an
acceptable state. Check for slips and related clock
controller error conditions. If none exist, then this state
is acceptable, and the flashing is identifying jitter on
the reference.
Off The clock controller is not equipped.
DCH On (Red) DCH is disabled.
On (Green) DCH is enabled, but not necessarily established.
Off DCH is not equipped.
System PRI maintenance tools
T
able 79: 2.0 Mb PRI commands (LD 60)
Command Action
DISI L Disable 2.0 Mb PRI when idle.
DISL L Force disable PRI.
ENLL L Enable PRI.
LCNT (L) List alarm counters.
2.0 Mb PRI maintenance
158 ISDN Primary Rate Interface Maintenance November 2011
Comments? infodev@avaya.com
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