Справочник Пользователя для Transition Networks Media Conversion 100BASE-TX to 100BASE-FX E-100BTX-FX-05

©2005 Transition Networks, Inc.
All trademarks are the property of their respective owners.
Technical information is subject to change without notice.

Far End Fault (FEF) is a troubleshooting feature that is generally used in conjunction
with Link Pass Through to notify both end devices of a loss of link. In the event of a
loss of the fiber RX signal on the far end converter the converter will automatically
generate a Far End Fault signal and send it on its TX fiber port to notify the near end
converter of a fiber link loss. Link Pass Through will then disable the copper links on
both ends; alerting both end devices of network trouble (see diagram below).

Transition Networks’s media converters that include the FEF feature do not need to be
used as pictured above as they will work with other network devices that support Far
End Fault per IEEE standards.





Both end devices automatically notified of link loss



Prevents loss of valuable data unknowingly transmitted over invalid link



Allows for quick diagnosis and resolution of network problems

Transition Networks's converters will automatically re-establish link in all network
conditions.

Transition Networks's converters will automatically re-establish link when connected to
switches if link was lost. With other manufacturers' converters the user must reset the
converter to re-establish the link.

Automatic Link Restoration allows the users to continue using Auto-Negotiation with
Link Loss Notification features. With other manufacturers' converters the user must
disable Auto-Negotiation and hard set the link.

Automatic Link Restoration on Transition Networks's products allows users to continue
using Link Loss Notification feature activated in both directions. Many competitive
solutions allow for Link Loss Notification activation only in one direction. If Link Loss
feature is activated in both directions, competitive products are put in a "deadly
embrace" and they cannot restore the link without resetting the converters.



No need to reset devices



Auto-Negotiation Enabled



Link Pass Through Activated in both directions

PAUSE signaling is an IEEE feature that
temporarily suspends data transmission
between two devices in the event that
one of the devices becomes
overwhelmed. In the event that a device
needs some time to clear network
congestion, it will send out a PAUSE
signal to the other end device, which
will then wait a pre-determined amount
of time before re-transmitting the data.
Transition's converters will pass PAUSE
signaling unhindered; ensuring that the
message is delivered to the end device.

PAUSE signaling is not standardized
over fiber media. Transition's media
converters will communicate this
signaling over fiber between the
converters to pass this signaling on to
the other end device.





PAUSE enabled devices allowed to

work properly



Prevents loss of valuable data

transmission



Reduces bottlenecks and allows

for efficient use of network devices



Single fiber technology offers a 50%
savings in fiber utilization. It is an
attractive solution to maximize the
usage of a limited number of fiber runs.

In a traditional optical link, a fiber pair
consists of two uni-directional strands.
The single fiber technology multiplexes
two optical wavelengths of 1310nm and
1550nm into a single strand fiber. In a
single fiber media converter each
wavelength is responsible for either the
transmit or receive function.
Consequently, the bi-directional
transmission is achieved by using a
single strand. The converters in a single
fiber scenario "match" each other's
wavelengths. Converter A transmits at
the wavelength of 1310nm and receives
at 1550nm while the other converter
transmits at 1550nm and receives at
1310nm. Therefore, converters are
usually used in pairs.

Single fiber technology is available on
all Transition Networks Media
Converters in maximum distance ranges
from 20 to 80km.