Siemens RUGGEDCOM ROS User Manual page 81

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RUGGEDCOM ROS
User Guide
Parameter
Speed
Dupx
Flow Control
LFI
Alarm
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.
4.
Click Apply.
Configuring an Ethernet Port
Description
media do not support auto-negotiation so these media must be explicitly configured to
either half or full duplex. Full duplex operation requires that both ends are configured as
such or else severe frame loss will occur during heavy network traffic.
Synopsis: { Auto, 10M, 100M, 1G }
Default: Auto
Speed (in Megabit-per-second or Gigabit-per-second). If auto-negotiation is enabled,
this is the speed capability advertised by the auto-negotiation process. If auto-
negotiation is disabled, the port is explicitly forced to this speed mode.
AUTO means advertise all supported speed modes.
Synopsis: { Auto, Half, Full }
Default: Auto
Duplex mode. If auto-negotiation is enabled, this is the duplex capability advertised by
the auto-negotiation process. If auto-negotiation is disabled, the port is explicitly forced
to this duplex mode.
AUTO means advertise all supported duplex modes.
Synopsis: { Off, On }
Default: On
Flow Control is useful for preventing frame loss during times of severe network traffic.
Examples of this include multiple source ports sending to a single destination port or a
higher speed port bursting to a lower speed port.
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.
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 fiber link.
Synopsis: { On, Off }
Default: On
Disabling link state alarms will prevent alarms and LinkUp and LinkDown SNMP traps
from being sent for that port.
Chapter 3
Device Management
67

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