Nortel Networks 3500, NTRN10AN manual Alarm provisioning, Engineering rules

Operation, administration, and maintenance (OAM) features 2-5

At the GE unidirectional add node, local client failures are propagated to the far end using Client Signal Fail (CSF) client management frames. Refer to Table 2-11 on page 2-78for list of ingress LAN alarms. If subrate GE WAN bandwidth is provisioned, enabling PAUSE flow control maybe required if the connected equipment can not properly send the GE traffic to match the provisioned WAN bandwidth.

Engineering rules

•Unidirectional Gigabit Ethernet traffic is supported on Linear and UPSR rings.

•Gigabit Ethernet Drop and Continue traffic is supported for UPSR rings only.

•A valid Gigabit Ethernet signal must be connected to the receiver interface of the 2xGigE/FC-P2P at each drop node, otherwise GE idles will be transmitted.

Note: An external optical splitter can be used to loop back the GE signal from the Tx port to the Rx port of 2xGigE/FC-P2P, if the connected equipment can not provide a valid GE signal.

•A "Link down" alarm will be raised if you re-provision a bidirectional connection to unidirectional. To prevent this alarm from being raised the following steps must be performed:

—Delete all cross-connections to the WAN port

—Delete the Ethernet facility (DLT-ETH)

—Add the Ethernet facility (ENT-ETH)

—Re-enter the unidirectional cross-connection(s)

Note: Refer to Bandwidth Management, 323-1059-320, Equipment and Facility Provisioning, 323-1059-350 and Alarm and Trouble Clearing, 323-1059-543.

•Auto-negotiation (AN) can be enabled, however both the receive (Rx) and transmit (Tx) fibers must connect to the same partner otherwise auto-negotiation will not complete properly.

•It is recommended to disable auto-negotiation (AN) and Pause transmit (PAUSETX) frames at the drop nodes in this configuration.

Alarm provisioning

Alarm provisioning allows you to disable or enable notification of an alarmed condition for any SONET alarm point on a network element. You can enable or disable alarm notification for one alarm or for a group of alarms with no effect on the alarm function. Disable an alarm to prevent that alarm from being reported to the user in any way (including alarm reports, TBOS, LEDs, or

Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004