RuggedCom RS400 manual Lfi, Link Alarms

Ethernet Ports

When the port is half-duplex it is accomplished using 'backpressure' where the switch simulates collisions causing the sending device to retry transmissions according to the Ethernet backoff algorithm. When the port is full-duplex it is accomplished using PAUSE frames which causes the sending device to stop transmitting for a certain period of time.

LFI

Synopsis: { Off, On }

Default: Off

Enabling Link-Fault-Indication (LFI) inhibits transmitting link integrity signal when the receive link has failed. This allows the device at far end to detect link failure under all circumstances. NOTE: this feature must not be enabled at both ends of a link.

Link Alarms

Synopsis: { Off, On }

Default: On

Disabling link state alarms will prevent alarms and LinkUp and LinkDown SNMP traps from being sent for that port.

Note If one end of the link is fixed to a specific speed and duplex type and the peer auto-negotiates, there is a strong possibility that the link will either fail to raise, or raise with the wrong settings on the auto-negotiating side. The auto-negotiating peer will fall back to half-duplex operation, even when the fixed side is full duplex. Full duplex operation requires that both ends are configured as such or else severe frame loss will occur during heavy network traffic. At lower traffic volumes the link may display few if any errors As the traffic volume rises the fixed negotiation side will begin to experience dropped packets while the auto-negotiating side will experience excessive collisions. Ultimately, as traffic load approaches 100% the link will become entirely unusable. These problems can be avoided by always configuring ports to the appropriate fixed values.

ROS™ v3.5 98 RS400