Справочник Пользователя для Transition Networks CFETF1016-205

©2006 Transition Networks, Inc.
All trademarks are the property of their respective owners.
Technical information is subject to change without notice.



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.



New product features are continuously
being added to Transition Networks's
products. These improvements are also
available for many products already
installed in the field. Management
modules and many media converters
can be updated remotely via firmware
upgrade. The remote upgrade feature
eliminates the need to ship the products
back to the manufacturer. The firmware
upgrades can be performed by a user
either locally via a Console port or
remotely via TFTP. 

The upgrades do not require the
reconfiguration of the SNMP
management or converter feature
settings.



PAUSE enabled devices allowed to work

properly



Prevents loss of valuable data

transmission



Reduces bottlenecks and allows for

efficient use of network devices



Link Pass Through is a troubleshooting feature that prevents media converters from isolating link failures
and it allows end devices to be notified in the event of a loss of link. Link Pass Through provides the media
converter with the ability to monitor both the fiber and the copper RX ports for a loss of signal. If a loss of
RX signal occurs on one media port, the converter will automatically disable the TX signal on the other port.
By shutting down the fiber TX port, the link failure is “passed through” to the remote converter and device
(see diagram below).



End device automatically notified of link loss



Prevents loss of valuable data unknowingly transmitted over an invalid link



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