Transition Networks, Inc.
M/GE-PSW-xX-01 User Guide
33398 Rev. D
Page 8 of 15
AutoCross
™
The AutoCross feature allows using either straight-through (MDI) or crossover (MDI-X) copper cables
when connecting to 10Base-T or 100Base-TX devices. AutoCross determines the characteristics of the
connection and automatically configures the device to link up, regardless of the copper cable
configuration, MDI or MDI-X.
Automatic Link Restoration
The media converter will automatically re-establish the link when connected to a switch if the link is lost,
even with Auto-Negotiation and Link Pass-through
(both directions)
enabled.
Full-duplex Flow Control
In a full-duplex network, maximum cable lengths are determined by the type of cables used (see cable
specifications section). The 512-Bit Rule does not apply in a full-duplex network. Note: Full duplex is ON
permanently for the fiber port only.
Half-duplex Flow Control (512-Bit Rule)
In a half-duplex network, the maximum cable lengths are determined by the roundtrip delay limitations
of each Fast Ethernet collision domain.
(A collision domain is the longest path between any two terminal
devices; e.g., a terminal, switch, or router.)
The 512-Bit Rule determines the maximum length of cable
permitted by calculating the round-trip delay in bit-times (BT) of a particular collision domain. If the
result is less than or equal to 512 BT, the path is good.
Back Pressure
Back pressure is used in half duplex mode. It ensures the retransmission of incoming packets when a
port using half-duplex is temporarily unable to receive incoming frames.
Flow Control
The process of adjusting the flow of data from one device to another ensures that the receiving device
can handle all the incoming data. This is particularly important where the sending device is capable of
transmitting data much faster than the receiving device can accept it.
Distance Extension
The M/GE-PSW-xX-01 media converters can segment one (1) 10Base-T copper Ethernet, 100Base-T
copper fast Ethernet, or 1000Base-T copper Gigabit Ethernet, and one (1)1000 Base-X fiber Fast
Ethernet collision domain:
•
In a half-duplex Ethernet or Fast Ethernet environment, the M/GE-PSW-xX-01 media converters
extend network distances by segmenting collision domains so that the 512-Bit Rule applies
separately to each collision domain.
•
In a full-duplex Ethernet or Fast Ethernet environment, the M/GE-PSW-xX-01 media converters
extend network distances to the physical cable limitations imposed by the selected twisted-pair
copper fiber cables.
