IMC Networks MCPC 10/100 - Manual (Page 14)

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There is no Auto Negotiation in either of the Force modes.
Auto Negotiation (ISA Version)
When connecting two McPC 10/100s between two end stations (devices such as
switches, hubs and repeaters), all devices in the media conversion should ideally
support, and be utilizing, Auto Negotiation functionality. 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. Therefore, IMC recommends:
• Configuring every device in the media conversion for Auto Negotiation.
• For installations where Auto Negotiation is NOT possible from one end of the
media conversion to the other, manually configure all devices for 10 Mbps or
100 Mbps connections.
Transparency (ISA Version)
Transparency is only available when using Auto Negotiation mode; it is not available
in either of the two Force modes. When the McPC 10/100 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 a single entity. Therefore, if a fault occurs on
any segment between the two end devices, link LEDs on the end devices will go out.
Transparency is available when the McPC 10/100 is operating in Auto Negotiation
mode. Therefore 6 Auto Negotiation must be ON and 5 (LFD), 7 (Force) and 8 (10 or
100) must be OFF.
Transparency
Link Fault Detection (ISA Version)
Link Fault Detection (LFD) is only available when using Force 10 or Force 100 mode.
It is not available in Auto Negotiation mode. When LFD is enabled and the input link
is down at one interface to the McPC 10/100, the transmitter output on that interface
will blink. It applies to both network interfaces and to both data rates. If the link at
the other interface to the McPC 10/100 is also down, there is no output. LFD causes
the Link Up indicator of the link partner to blink.