Allied Telesis AT-MMC200/LC, Installation Manual

Page: 30 / 66

Chapter 1: Overview
30
V3 Series Media Converters
The MMC2000/200 V3 series media converters have the SML and ML
features to pass the link status from one port to the other for endpoints,
make a connection problem visible, and help identify where
troubleshooting is required.
The SML mode is for two media converters in pair; the ML mode is for a
media converter in standalone.
Note
For the V2 series media converter, see “V2 Series Media
Converters” on page 29.
Note
To find out whether your device is V2 or V3, see “Differences
Between V2 and V3” on page 28.
Guidelines for the
SML and ML
Modes
Here are guidelines for the ML and SML modes:

The MMC2000/200 V3 series media converter is set to either the
ML or SML mode.

Use the DIP switch to select ML or SML.

Select the ML mode when a media converter is connected
standalone between a fiber endpoint and copper endpoint. See
“Standalone Media Converter in ML Mode” on page 34.

Select the SML mode when two media converters are connected in
pairs. See “Media Converters in Pairs in SML Mode” on page 33.

The SML feature of fiber link communication on a link failure can
cause problems with some switches when the fiber port is directly
connected to a switch. The SML mode is intended when the fiber
port is connected to another Allied Telesis media converter.
Example
Scenarios in ML
and SML Modes
The following example scenarios explain how the V3 series media
converter behaves in the ML or SML mode:

“Standalone Media Converter in ML Mode” on page 34

“Media Converters in Pairs in SML Mode” on page 33