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CMEFG10xx-1xx / SMEFG10xx-1xx
24-hour Technical Support: 1-800-260-1312 International: 00-1-952-941-7600
Operation
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Features
Rate conversion
The media converter allows the connection of 10 Mb/s, 100 Mb/s, and 1000 Mb/s
terminal devices over a 1000Base-SX/LX gigabit Ethernet fiber network.
Bandwidth allocation
Bandwidth allocation allows the network administrator to set the bandwidth of the
media converter to in 64 KB increments via SNMP management. The bandwidth
can be allocated in any multiple of 64 KB from “0” up to the converter’s full
bandwidth capability in either KB or Mb values.
AutoCross™
The AutoCross feature allows either straight-through (MDI) or crossover (MDI-X)
cables to be used when connecting to 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.
(Requires no operator intervention.)
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.
The pause feature is set in the Software mode using the SNMP interface, and can
be set to one of four settings:
•
Disable
(i.e., no pause)
•
Symmetrical pause
•
Asymmetric TX
(transmit)
pause
•
Asymmetric RX
(receive)
pause
Notes:
1. Enable the “pause feature” if it is present on ALL network
devices attached to the media converter(s). Otherwise, disable
the pause feature.
2. The “pause feature” is not supported in the SMEFG10xx-1xx Stand-
Alone models.
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Operation
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Automatic link restoration
The CMEFG10xx-1xx and SMEFG10xx-1xx media converters include a unique
feature called automatic link restoration. These two converters will automatically
restore the link between network devices after a fault condition has been
corrected. The competitors’ products, in contrast, require the user to power
down, then power up the converters, after a fault condition has been corrected.
Loop-Back
When activated via SNMP management, this diagnostic feature enables the media
converter to loop back the signal from the RX port to the TX port for testing and
troubleshooting purposes. Test signals from a bit error test unit
(Smartbits™, etc.)
can then be inserted into either the copper or fiber link to test a particular
segment.
This type of diagnostic test can only be performed on the remote location. See
the “Troubleshooting” section for an example.
Auto-Negotiation
The Auto-Negotiation feature allows the media converter to perform automatic
configuration to achieve the best possible mode of operation over both the copper
and fiber links. The media converter will broadcast its speed
(10 Mb/s, 100 Mb/s, or
1000 Mb/s)
and duplex mode
(full/half)
to the other devices and negotiate 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.
Disable Auto-Negotiation
There may be a scenario where the user may want to disable Auto-Negotiation
(e.g., when the media converter is linked to a non-negotiating device).
In this instance,
the mode of operation will drop to the least common denominator between the
two devices
(e.g., 100 Mb/s, half-duplex).
Disabling this feature gives the user the
ability to force the connection to the desired speed and duplex mode of operation.
Note:
When Auto-Negotiation is disabled, the copper port con only be forced to
10 or 100 Mb/s and half- or full-duplex. 1000 Mb/s on the copper link
always requires Auto-Negotiation to be enabled.
