Product Features; Auto-Negotiation - Transition Networks CRMFE1011-200 User Manual

CRMFE10xx-20x / SRMFE10xx-20x
Operation
-- Continued

Product Features

Secure and Transparent Data
The data is both secure and transparent because it uses none of the Ethernet
bandwidth. In addition, the data exists outside the normal Ethernet framing
format.

Auto-Negotiation

The Auto-Negotiation feature allows the media converter automatically
configures itself to achieve the best possible mode of operation over a link.
The media converter broadcasts its speed (10Mb/s, 100Mb/s, or 1000Mb/s)
and duplex capabilities (full or half) to the other device and negotiates the best
mode of operation. Auto-Negotiation allows quick and easy installation
because the optimal link is established automatically. No user intervention is
required to determine the best mode of operation.
A scenario where the media converter is linked to a non-negotiating device is
a case where the user may want to disable Auto-Negotiation. In this instance,
the mode of operation will drop to the least common denominator between
the two devices (e.g. 10 Mb/s, half-duplex). Disabling this feature gives the
user the ability to force the connection to the best mode of operation.
NOTE: The media converter does NOT support rate conversion between
10Mb/s, 100Mb/s, and 1000Mb/s network devices.
Link Pass-Through
The Link Pass-Through feature allows the media converter to monitor both the
fiber and copper RX (receive) ports for loss of signal. In the event of a loss of
an RX signal on one media port, the media converter will automatically
disable the TX (transmit) signal of the other media port, thus, "passing
through" the link loss.
media converter A
disables the fiber TX link
2
Near-End Media
Device Converter A
1
original fault
on the copper link
Remote Management Function
The SRMFE10xx-20x stand-alone media converter can be remotely managed
when connected via fiber cable to a local CRMFE10xx-20x slide-in-module
media converter that is installed in a managed Transition Networks
PointSystem™ chassis.
See page 10 for the available SNMP commands that enable the user to both
monitor and manage both the local and remote media converters.
8
24-hour Technical Support: 1-800-260-1312 International: 00-1-952-941-7600
media converter B
loses the fiber RX link
3
Media Far-End
Converter B Device
4
media converter B
disables the copper link
Operation
-- Continued
Product Features -- Continued
Far-End Fault
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).
Near-End Media
Device Converter A
4
media converter A
disables the copper link
Pause
The pause feature is used to temporarily suspend data transmission in order to
relieve buffer congestion. If a media converter needs some time to clear
network congestion, it will send a pause signal to the media converter at the
other end, which will wait a predetermined amount of time before re-
transmitting the data. This feature reduces data bottlenecks, allows for a more
efficient use of the network devices, and prevents the loss of valuable data.
In Hardware mode, the pause feature can be set to
• Disable (i.e., no pause)
• Enable (i.e., symmetrical pause)
In Software mode, the pause feature can be set to one of four settings:
• Disable (i.e., no pause)
• Symmetrical pause
• Asymmetric TX (transmit) pause
• Asymmetric RX (receive) pause
Enable the pause feature if it is present on ALL network devices attached to
the media converter(s). Otherwise, disable the pause feature.
AutoCross™
The AutoCross feature allows either straight-through (MDI) or crossover (MDI-
X) cables to be used when connecting to 100Base-TX devices, such as hubs,
transceivers, or network interface cards (NICs). AutoCross determines the
characteristics of the cable connection and automatically configures the unit
to link up, regardless of the cable configuration.
NOTE: Factory default is "enable AutoCross." Transition networks
recommends leaving the deivce in the "enable" mode.
techsupport@transition.com -- Click the "Transition Now" link for a live Web chat.
original fault
on the fiber link
1
Media Far-End
Converter B Device
2
3
Far-End Fault media converter B
signal is sent disables the copper link
9