4
Selective Advertising is a mode in which the speed and duplex for the copper and the
fiber are specifically advertised. This mode is available when DSW 1-4 are set to OFF.
Troubleshooting Features
The iMcV-LIM 10/100 media converters include two advanced troubleshooting
features to help locate “silent failures” on the network.
Transparency
Link Fault Detection (LFD)
Transparency
Transparency is only available in PNP mode. Transparency treats the connection
between the two end devices as if there were no media converters installed. 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. This prevents any failure on the link between the end
units from going undetected.
As stated, transparency is available when iMcV-LIM 10/100 is operating in PNP (AN)
mode:
S2 PNP (AN) must be ON
S1 (LFD), S3 (Force) and S4 (10 or 100) must be OFF
Dip
Switch
Feature
Selective
Advertising
PNP
(AN)
Force
100
Force
10
Force
100 LFD
Force
10 LFD
S1
LFD
OFF OFF
OFF
OFF
ON ON
S2
PNP (AN)
OFF ON
OFF
OFF
OFF
OFF
S3
FORCE
OFF OFF ON ON ON ON
S4
10/100
OFF OFF
OFF
ON
OFF
ON
5
Link Fault Detection in FORCE Modes (LFD)
Link Fault Detection (LFD) is only available when using Force 10 or Force 100 mode
and provides the same information as link fault pass through as does in PNP mode to
detect silent failures. When LFD is enabled and the input link is down at one
interface to the iMcV-LIM 10/100, the transmitter output on that interface is turned
off for about 425ms every 3.8 seconds (i.e., blinking). It 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. LFD causes the Link Up indicator of the link
partner to blink.
When the iMcV-LIM 10/100 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 either S4 ON for 10 Mbps or S4 OFF for 100 Mbps
S2 must also be OFF
NOTE
When using the LFD feature, if the DIP Switches are in any other combination than listed
above, the iMcV-LIM 10/100 may exhibit erratic behavior.
