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Instruction manual

ManualsBrandsIMC Networks ManualsNetworkingiMcV-LIM, 10/100-SM1310/LONG-ST
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6
Auto Negotiation
When connecting two modules between two end stations (devices such as switches,
hubs and repeaters), all devices should ideally support, and be utilizing, Auto
Negotiation. While it is possible to have Auto Negotiating devices on one side of the
media conversion and fixed (non-Auto Negotiating) devices on the other, link LEDs
will react differently depending on where a link fault occurs.
Troubleshooting Features
The iMcV-LIM includes two advanced troubleshooting features, Transparency and
Link Fault Detection, to help locate “silent failures” on the network.
Transparency
Transparency is only available when using AN. When the iMcV-LIM is Auto
Negotiating, transparency treats the connection between the two end devices as if
there were no media converters installed. For example, in a typical application
where two media converters are installed between two copper-based switches the
twisted pair cables as well as the fiber cable are seen as “one” entity. If a fault occurs
on any segment between the two end devices, link LEDs on the end devices will go
out.
Since transparency is only available when the iMcV-LIM is operating in Auto
Negotiation mode, S2 (AN) must be ON and S1 (LFD), S3 (Force) and S4 (10/100)
must be OFF.
Link Fault Detection
Link Fault Detection (LFD) is only available when using Force 10 or Force 100 mode.
When LFD is enabled and the input link is down at one interface to the iMcV-LIM,
the LFD LED will blink. This applies to both network interfaces and to both data
rates. If the link at the other interface to the iMcV-LIM 10/100 is also down, there is
no output and LFD causes the Link LED to blink.
When the iMcV-LIM is in one of the Force modes, enable LFD by setting S1 to the
ON position. In order for LFD to function properly, Force mode must be enabled by
setting S3 to ON with S4 set for the proper speed.
Twisted Pair Crossover/Pass-Through Switch
The iMcV-LIM features a crossover/pass-through push-button switch, located on the
faceplate next to the RJ-45 connector, to set the twisted pair connection type. Select
a pass-through connection by pressing the push-button IN. A crossover connection is
selected when the push-button is OUT. If it is not clear which connection is needed,
set the push-button to whatever setting makes the twisted pair LNK LED glow.