8
Mx/E-PSW-FX-01
Tech Support: 1-800-260-1312 International: 00-1-952-941-7600
(24 hours)
Operation -- Continued
Product features -- continued
Automatic link restoration
The media converter will automatically re-establish the link when connected to
switches 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 page 1
(front cover)
for Mx/E-PSW-FX-01 cable specifications.
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 round-
trip 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.
For more information on the 512-Bit Rule, see the white paper titled “Collision
Domains” on the Transition Networks website at: www.transition.com
Flow Control
The process of adjusting the flow of data from one device to another ensures that
the receiving device can handle all of 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.
Media Converter
Auto-Negotiation
AutoCross
LPT
FEF
M/E-PSW-FX-01
Yes
Yes
No
Yes
MP/E-PSW-FX-01
Yes
Yes
Yes
Yes
MU/E-PSW-FX-01
Yes
Yes
Yes
Yes
Auto-Negotiation, AutoCross, Link Pass-Through, Far End Fault
[email protected] -- Click the “Transition Now” link for a live Web chat.
9
Operation -- Continued
Product features -- continued
Distance extension
The Mx/E-PSW-FX-01 media converters can segment one (1) 10Base-T copper
Ethernet and/or 100Base-TX copper Fast Ethernet, and one (1)100Base-FX fiber
Fast Ethernet collision domain:
In a half-duplex Ethernet or Fast Ethernet environment, the Mx/E-PSW-FX-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 Mx/E-PSW-FX-01
media converters extend network distances to the physical cable limitations
imposed by the selected twisted-pair copper fiber cables.
Rate conversion
The Mx/E-PSW-FX-01 media converters allow connection of 10Mb/s terminal
devices on a 10Base-T legacy Ethernet copper network to 100Mb/s terminal devices
on a 100Base-TX Fast Ethernet copper network and/or to 100Mb/s terminal devices
on a 100Base-FX Fast Ethernet fiber network.
Far-End Fault
(always ON)
When a fault occurs on an incoming fiber link (1), the media converter transmits a
Far-End Fault signal on the outgoing fiber link (2). In addition the Far-End Fault
signal also activates the Link Pass-Through, which, in turn, disables the link on the
copper portion of the network (3) and (4).
Far-End Fault
signal is sent
Media
Converter A
Media
Converter B
Near-End
Device
Far-End
Device
original fault
on the fiber link
media converter B
disables the copper link
media converter A
disables the copper link
3
4
2
1
