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AT-3714F, AT-3726 Hardware Description
Transmit Pacing
Mirror Port
1-4
With the Cut-through (fragment-free) method, the switch starts to
forward the incoming packet to its destination while the packet is
still being received. Cut-through (fragment-free) provides low
latency for forwarding frames and also filtering fragment frames by
not transmitting a frame until 64 bytes have been received by the
switch. In Cut-through (fragment-free) mode, fragment frames or
runts and short frames (frames less than 64 bytes) are filtered, thus
preventing error frames from propagating throughout the network
causing congestion.
Select the Cut-through (fragment-free) method if you are running
time-sensitive applications because it provides lower latency
through the switch.
Transmit pacing is enabled on a per port basis. When transmit pacing
is enabled, the switch alters its transmission routine during heavy
network activity. When the switch senses heavy traffic, it alters its
transmission routing by intentionally inserting additional delay
between transmission attempts. This added delay reduces collision
rates, thus reducing the number of transmission attempts, which
helps reduce CPU utilization, lightens overall network traffic, and
allows the network time to normalize before attempting
transmission.
If this additional delay is not applied, the switch attempts to transmit
on an overloaded network, increasing the number of unsuccessful
transmission attempts.
For detailed information concerning software and management
features, see the "AT- S20 User's Guide" located on Allied Telesyn's
website at alliedtelesyn.com/manuals.htm.
The switch has a dedicated Mirror port. Administrators can use the
Omega software to configure the Mirror port and modes. The Mirror
port can monitor traffic on any 10Mbps port, but only one port at a
time. An extended LANalyzer or an RMON probe can be connected
to the port mirroring connector using a standard Category 3 UTP
cable.
In full duplex mode the user needs to determine if they want to
monitor TX or only RX data, but in only one direction at a time. In half
duplex mode, both RX/TX can be monitored simultaneously.
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