Automatic channel state provisioning is a capability provided on Alcatel-Lucent 1665 DMX NEs that suppresses reporting of transient alarms and events during provisioning by supporting multiple states (see previous section) for VT1.5, VC-12, STS-1, STS-3(c), STS-12(c), STS-48(c) channels.
While an end-to-end circuit is being set up, particularly during VT1.5/VC-12 and STS-n cross-connection provisioning, several transient maintenance signals result. Without automatic channel state provisioning, these are reported as alarms and events. The technicians are expected to ignore these transient alarms and initiate corrective action only if the alarms persist after the provisioning is completed. To avoid the confusion created by this, Alcatel-Lucent 1665 DMX provides automatic channel state provisioning.
A VT1.5 or STS-n channel is kept in the default automatic (OOS-MA-AS) state until the reception of a valid signal (for STS channel states, a valid signal is one free of LOP-P, AIS-P, UNEQ-P, and SF-- for VT channel states, a valid signal is one free of LOP-V, AIS-V, and UNEQ-V.) in that channel. While in OOS-MA-AS state, no alarms or events are reported on the channel. On receiving a valid signal, which occurs when the end-to-end circuit is completely provisioned, the channel automatically changes to the in-service (IS) state, where it resumes normal alarm and event reporting. An additional state, not-monitored (OOS), is also supported in which alarm and event reporting is suppressed regardless of the validity of the signal being received on the channel. Like the port state provisioning capabilities already provided for physical ports like DS1, DS3, and EC-1, the user can submit commands to manually change a channel from IS or OOS-MA-AS to OOS, and from OOS to OOS-MA-AS. A user cannot manually change from OOS-MA-AS or OOS to IS.
For pass-through cross-connects, the channel state transitions from OOS-MA-AS to OOS upon receiving a good signal. This is different than what happens on dropped tribs. On dropped tributaries, the channel state automatically transitions from OOS-MA-AS to IS upon receiving a good signal.
Note:
LOP-P is reported regardless of channel state. STS LOP (LOP-P) is reported on any cross-connected tributary, even when the STS channel state is HOSANNAS or OOS. For BLSR, LOP-P is also reported on all working and protection tributaries, independent on whether or not there is a cross-connect.
| November 2011 | Copyright © 2011 Alcatel-Lucent. All rights reserved. |