User's Manual

Horizon Compact Plus Release 1.0.1 Wireless Ethernet Product User Manual – Volume 4
2.0 Ethernet Operation Administration and Maintenance
(EOAM)
EOAM is a protocol for installing, monitoring, and troubleshooting metro Ethernet networks. Horizon
Compact Plus supports the EOAM features as defined in IEEE 802.3ah with the exception of the
hardware loopback feature. EOAM is a relatively slow protocol with modest bandwidth requirements.
The frame transmission rate is limited to a maximum of 10 frames per second; therefore, the impact of
OAM on normal operations is negligible. The EOAM frames cannot propagate beyond a single hop
within an Ethernet network .
2.1 EOAM Features
Discovery - Identifies the devices in the network and the devices OAM capabilities .
Link Monitoring - Detects and indicates link events under a variety of conditions. The events
include the following:
Error Frame
Error Frame Period
Error Frame Seconds Summary
HAAM and AAM up/down-switch
RLS event
Remote Failure Indication - Slowly deteriorating quality is difficult to detect. EOAM provides a
mechanism for an OAM entity to convey these failure conditions to its peer. The following failure
conditions can be communicated:
Link Fault – The receiver detects loss of signal. This condition is sent once per second
Critical Event - An unspecified critical event has occurred. This type of event is vendor
specific. The critical event is sent immediately and continuously
.
Remote Loopback - An OAM entity can put its remote peer into software loopback mode.
Note that it is not possible to start a local EOAM loopback on a node that has a radio or network
loopback already in operation.