4
Modes of Operation
The McBasic 10/100 has four modes of operation:
•
Auto Negotiation/PNP
•
FORCE 10Mbps
•
FORCE 100Mbps
•
Selective Advertising AN (All OFF)
NOTE
The McBasic 10/100 cannot be set for Half- or Full-Duplex manually. Duplex is determined by
the link partners connected to the McBasic 10/100.
The McBasic 10/100 media converter is typically installed in pairs and provides
compatibility with legacy 10BASE-FL devices, while also providing support for
100Mbps devices. This is a PHY based device to allow very low propagation delays
but in turn the speed and duplex of both its copper and fiber ports must be the same.
For the McBasic to function properly, the copper port must have link before the fiber
port will link up.
In a back to back configuration, both units must have the Plug-N-Play (PNP) switch
set to ON for the copper ports to auto negotiate from end to end. In this mode the
fiber link becomes transparent allowing the units at both ends of the link to function
as if they were connected over one copper line. All auto negotiation signaling is the
result of signaling received on the ports of the unit. Only use this mode with two
McBasic media converters installed in pairs, back to back.
With all switches set to OFF
,
the unit sends its own Auto Negotiation (AN) signaling
on the copper port. This advertises both FDX and HDX with the physical speed that
is detected on the fiber line. This signaling cannot occur until this fiber port is active.
If auto negotiation signaling is also received over the fiber from the far end
equipment, the auto negotiation signaling on the copper port will include this
information.
In all of the FORCE modes, no auto negotiation signals are sent or acted on. The unit
will blindly send the speed assigned and supports either FDX or HDX data. The LFD
function is only available in the FORCE modes.
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 5-8 are set to OFF.
