V1 And V2 Series Media Converters; Figure 9: Two Media Converters In Pair; Figure 10: Possible Situation With Standalone Media Converter With Sml - Allied Telesis DMC1000/100 Series Installation Manual

Chapter 1: Overview

V1 and V2 Series Media Converters

Copper Cable
Managed
Endpoint
24
The DMC1000/100 series media converters have two versions: V1 and
V2. Both V1 and V2 have Smart MissingLink™ (SML). In addition to SML,
the Missing Link (ML) feature is added to the V2 series media converters.
SML passes a link status from one port to the other so that user's
managed endpoints can detect a failure at links where the endpoints are
not directly connected. SML is intended for use when the media
converters are installed in pair, connecting two copper endpoints, as
shown in Figure 9.
SML On
DMC1000/100
Media Converter
Passing
Link Status
Note
For detailed information about SML, see "Smart MissingLink™
(SML)" on page 28.
SML helps identify a link problem in two media converters in pair;
however, when SML is used in the media converter in standalone, SML
may cause problems in some situations.
Figure 10 illustrates a situation where a fiber port on the media converter
is connected to a certain switch. When the copper link fails, the fiber link
goes up and down and the switch detects it as a problem with the fiber
link. As a result, the switch disables the fiber port so that the fiber port
cannot reconnect even when the copper link is back.
Copper Cable
End Node
Link LED Off Link Down
Figure 10. Possible Situation with Standalone Media Converter with SML
When encountering the problem, you either change the switch setting or
turn off SML on the media converter.
D
Fiber Cable
Media Converter
Passing
Link Status
Figure 9. Two Media Converters in Pair
SML On
DMC1000/100
Copper Fiber
LINK/ACT LINK/ACT
LED LED
Off Blinking
SML On
MC1000/100
Copper Cable
Passing
Link Status
Fiber Cable
Fiber port
Link Up/Down
Disabled
Managed
Endpoint
Some
Switch